diff --git a/composer.json b/composer.json
index 5b5a91d2..ee4f9bd5 100644
--- a/composer.json
+++ b/composer.json
@@ -42,7 +42,7 @@
         "phpoffice/common": "^0.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "4.8.*",
+        "phpunit/phpunit": "^4.8.36",
         "phpdocumentor/phpdocumentor":"2.*",
         "twig/twig":"1.27",
         "squizlabs/php_codesniffer": "^2.7",
diff --git a/tests/PhpWord/Collection/CollectionTest.php b/tests/PhpWord/Collection/CollectionTest.php
index 22f89b72..a8757171 100644
--- a/tests/PhpWord/Collection/CollectionTest.php
+++ b/tests/PhpWord/Collection/CollectionTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\Element\Footnote;
  *
  * Using concrete class Footnotes instead of AbstractCollection
  */
-class CollectionTest extends \PHPUnit_Framework_TestCase
+class CollectionTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test collection
diff --git a/tests/PhpWord/ComplexType/FootnotePropertiesTest.php b/tests/PhpWord/ComplexType/FootnotePropertiesTest.php
index 55e22e6f..b8df9bbe 100644
--- a/tests/PhpWord/ComplexType/FootnotePropertiesTest.php
+++ b/tests/PhpWord/ComplexType/FootnotePropertiesTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\SimpleType\NumberFormat;
  * @coversDefaultClass \PhpOffice\PhpWord\ComplexType\FootnoteProperties
  * @runTestsInSeparateProcesses
  */
-class FootnotePropertiesTest extends \PHPUnit_Framework_TestCase
+class FootnotePropertiesTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test setting style with normal value
diff --git a/tests/PhpWord/ComplexType/ProofStateTest.php b/tests/PhpWord/ComplexType/ProofStateTest.php
index e807ca2f..baf2009e 100644
--- a/tests/PhpWord/ComplexType/ProofStateTest.php
+++ b/tests/PhpWord/ComplexType/ProofStateTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\ComplexType;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\ComplexType\ProofState
  */
-class ProofStateTest extends \PHPUnit_Framework_TestCase
+class ProofStateTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Tests the getters and setters
diff --git a/tests/PhpWord/Element/AbstractElementTest.php b/tests/PhpWord/Element/AbstractElementTest.php
index 458b94c8..87bb5e18 100644
--- a/tests/PhpWord/Element/AbstractElementTest.php
+++ b/tests/PhpWord/Element/AbstractElementTest.php
@@ -20,7 +20,7 @@ namespace PhpOffice\PhpWord\Element;
 /**
  * Test class for PhpOffice\PhpWord\Element\AbstractElement
  */
-class AbstractElementTest extends \PHPUnit_Framework_TestCase
+class AbstractElementTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test set/get element index
diff --git a/tests/PhpWord/Element/BookmarkTest.php b/tests/PhpWord/Element/BookmarkTest.php
index da86a62e..bd5d27ae 100644
--- a/tests/PhpWord/Element/BookmarkTest.php
+++ b/tests/PhpWord/Element/BookmarkTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Element;
  *
  * @runTestsInSeparateProcesses
  */
-class BookmarkTest extends \PHPUnit_Framework_TestCase
+class BookmarkTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance
diff --git a/tests/PhpWord/Element/CellTest.php b/tests/PhpWord/Element/CellTest.php
index aff208c4..4e8daa0e 100644
--- a/tests/PhpWord/Element/CellTest.php
+++ b/tests/PhpWord/Element/CellTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Element;
  *
  * @runTestsInSeparateProcesses
  */
-class CellTest extends \PHPUnit_Framework_TestCase
+class CellTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance
diff --git a/tests/PhpWord/Element/CheckBoxTest.php b/tests/PhpWord/Element/CheckBoxTest.php
index fb71b8c2..d5bda9bd 100644
--- a/tests/PhpWord/Element/CheckBoxTest.php
+++ b/tests/PhpWord/Element/CheckBoxTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\Style\Font;
  *
  * @runTestsInSeparateProcesses
  */
-class CheckBoxTest extends \PHPUnit_Framework_TestCase
+class CheckBoxTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Construct
diff --git a/tests/PhpWord/Element/CommentTest.php b/tests/PhpWord/Element/CommentTest.php
index fd2c814d..d33a54f6 100644
--- a/tests/PhpWord/Element/CommentTest.php
+++ b/tests/PhpWord/Element/CommentTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Element;
  *
  * @runTestsInSeparateProcesses
  */
-class CommentTest extends \PHPUnit_Framework_TestCase
+class CommentTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance
diff --git a/tests/PhpWord/Element/FieldTest.php b/tests/PhpWord/Element/FieldTest.php
index 1bd0c216..8baa68e4 100644
--- a/tests/PhpWord/Element/FieldTest.php
+++ b/tests/PhpWord/Element/FieldTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Element;
  *
  * @runTestsInSeparateProcesses
  */
-class FieldTest extends \PHPUnit_Framework_TestCase
+class FieldTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance
diff --git a/tests/PhpWord/Element/FooterTest.php b/tests/PhpWord/Element/FooterTest.php
index 2938ae5e..b68e80cd 100644
--- a/tests/PhpWord/Element/FooterTest.php
+++ b/tests/PhpWord/Element/FooterTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Element;
  *
  * @runTestsInSeparateProcesses
  */
-class FooterTest extends \PHPUnit_Framework_TestCase
+class FooterTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance
diff --git a/tests/PhpWord/Element/FootnoteTest.php b/tests/PhpWord/Element/FootnoteTest.php
index b02ab5c6..fd4c8d03 100644
--- a/tests/PhpWord/Element/FootnoteTest.php
+++ b/tests/PhpWord/Element/FootnoteTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Element;
  *
  * @runTestsInSeparateProcesses
  */
-class FootnoteTest extends \PHPUnit_Framework_TestCase
+class FootnoteTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance without parameter
diff --git a/tests/PhpWord/Element/HeaderTest.php b/tests/PhpWord/Element/HeaderTest.php
index 13ace285..29b2fef5 100644
--- a/tests/PhpWord/Element/HeaderTest.php
+++ b/tests/PhpWord/Element/HeaderTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Element;
  *
  * @runTestsInSeparateProcesses
  */
-class HeaderTest extends \PHPUnit_Framework_TestCase
+class HeaderTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance
diff --git a/tests/PhpWord/Element/ImageTest.php b/tests/PhpWord/Element/ImageTest.php
index b681b81f..00449e1f 100644
--- a/tests/PhpWord/Element/ImageTest.php
+++ b/tests/PhpWord/Element/ImageTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\SimpleType\Jc;
  *
  * @runTestsInSeparateProcesses
  */
-class ImageTest extends \PHPUnit_Framework_TestCase
+class ImageTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance
diff --git a/tests/PhpWord/Element/LineTest.php b/tests/PhpWord/Element/LineTest.php
index a6e3f79b..4d414944 100644
--- a/tests/PhpWord/Element/LineTest.php
+++ b/tests/PhpWord/Element/LineTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Element;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\Line
  * @runTestsInSeparateProcesses
  */
-class LineTest extends \PHPUnit_Framework_TestCase
+class LineTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Create new instance
diff --git a/tests/PhpWord/Element/LinkTest.php b/tests/PhpWord/Element/LinkTest.php
index 48b576c3..63e8f1de 100644
--- a/tests/PhpWord/Element/LinkTest.php
+++ b/tests/PhpWord/Element/LinkTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\Style\Font;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\Link
  * @runTestsInSeparateProcesses
  */
-class LinkTest extends \PHPUnit_Framework_TestCase
+class LinkTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Create new instance
diff --git a/tests/PhpWord/Element/ListItemRunTest.php b/tests/PhpWord/Element/ListItemRunTest.php
index 0c4c1ac9..999756ba 100644
--- a/tests/PhpWord/Element/ListItemRunTest.php
+++ b/tests/PhpWord/Element/ListItemRunTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Element;
  *
  * @runTestsInSeparateProcesses
  */
-class ListItemRunTest extends \PHPUnit_Framework_TestCase
+class ListItemRunTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance
diff --git a/tests/PhpWord/Element/ListItemTest.php b/tests/PhpWord/Element/ListItemTest.php
index 775a97d4..5fae34d4 100644
--- a/tests/PhpWord/Element/ListItemTest.php
+++ b/tests/PhpWord/Element/ListItemTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Element;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\ListItem
  * @runTestsInSeparateProcesses
  */
-class ListItemTest extends \PHPUnit_Framework_TestCase
+class ListItemTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Get text object
diff --git a/tests/PhpWord/Element/ObjectTest.php b/tests/PhpWord/Element/ObjectTest.php
index 51ed19b5..71f12974 100644
--- a/tests/PhpWord/Element/ObjectTest.php
+++ b/tests/PhpWord/Element/ObjectTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Element;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\Object
  * @runTestsInSeparateProcesses
  */
-class ObjectTest extends \PHPUnit_Framework_TestCase
+class ObjectTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Create new instance with supported files, 4 character extention
diff --git a/tests/PhpWord/Element/PageBreakTest.php b/tests/PhpWord/Element/PageBreakTest.php
index 69a71204..3b081848 100644
--- a/tests/PhpWord/Element/PageBreakTest.php
+++ b/tests/PhpWord/Element/PageBreakTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Element;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\PageBreak
  * @runTestsInSeparateProcesses
  */
-class PageBreakTest extends \PHPUnit_Framework_TestCase
+class PageBreakTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Executed before each method of the class
diff --git a/tests/PhpWord/Element/PreserveTextTest.php b/tests/PhpWord/Element/PreserveTextTest.php
index a47cc77c..c2767a4f 100644
--- a/tests/PhpWord/Element/PreserveTextTest.php
+++ b/tests/PhpWord/Element/PreserveTextTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\SimpleType\Jc;
  *
  * @runTestsInSeparateProcesses
  */
-class PreserveTextTest extends \PHPUnit_Framework_TestCase
+class PreserveTextTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Create new instance
diff --git a/tests/PhpWord/Element/RowTest.php b/tests/PhpWord/Element/RowTest.php
index cb365dad..9abf3776 100644
--- a/tests/PhpWord/Element/RowTest.php
+++ b/tests/PhpWord/Element/RowTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Element;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\Row
  * @runTestsInSeparateProcesses
  */
-class RowTest extends \PHPUnit_Framework_TestCase
+class RowTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Create new instance
diff --git a/tests/PhpWord/Element/SDTTest.php b/tests/PhpWord/Element/SDTTest.php
index 537841a6..41eae213 100644
--- a/tests/PhpWord/Element/SDTTest.php
+++ b/tests/PhpWord/Element/SDTTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Element;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Element\SDT
  */
-class SDTTest extends \PHPUnit_Framework_TestCase
+class SDTTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Create new instance
diff --git a/tests/PhpWord/Element/SectionTest.php b/tests/PhpWord/Element/SectionTest.php
index aebfc9b7..8b6c9a43 100644
--- a/tests/PhpWord/Element/SectionTest.php
+++ b/tests/PhpWord/Element/SectionTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\Style;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\Section
  * @runTestsInSeparateProcesses
  */
-class SectionTest extends \PHPUnit_Framework_TestCase
+class SectionTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * @covers ::setStyle
diff --git a/tests/PhpWord/Element/TOCTest.php b/tests/PhpWord/Element/TOCTest.php
index 655d567c..d826a1a1 100644
--- a/tests/PhpWord/Element/TOCTest.php
+++ b/tests/PhpWord/Element/TOCTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\PhpWord;
  *
  * @runTestsInSeparateProcesses
  */
-class TOCTest extends \PHPUnit_Framework_TestCase
+class TOCTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Construct with font and TOC style in array format
diff --git a/tests/PhpWord/Element/TableTest.php b/tests/PhpWord/Element/TableTest.php
index 3085aee2..0bbefb24 100644
--- a/tests/PhpWord/Element/TableTest.php
+++ b/tests/PhpWord/Element/TableTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Element;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\Table
  * @runTestsInSeparateProcesses
  */
-class TableTest extends \PHPUnit_Framework_TestCase
+class TableTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Create new instance
diff --git a/tests/PhpWord/Element/TextBoxTest.php b/tests/PhpWord/Element/TextBoxTest.php
index cc61e20d..63b093c9 100644
--- a/tests/PhpWord/Element/TextBoxTest.php
+++ b/tests/PhpWord/Element/TextBoxTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Element;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\TextBox
  * @runTestsInSeparateProcesses
  */
-class TextBoxTest extends \PHPUnit_Framework_TestCase
+class TextBoxTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Create new instance
diff --git a/tests/PhpWord/Element/TextBreakTest.php b/tests/PhpWord/Element/TextBreakTest.php
index 62186244..9b25bac3 100644
--- a/tests/PhpWord/Element/TextBreakTest.php
+++ b/tests/PhpWord/Element/TextBreakTest.php
@@ -26,7 +26,7 @@ use PhpOffice\PhpWord\Style\Paragraph;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\TextBreak
  * @runTestsInSeparateProcesses
  */
-class TextBreakTest extends \PHPUnit_Framework_TestCase
+class TextBreakTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Construct with empty value
diff --git a/tests/PhpWord/Element/TextRunTest.php b/tests/PhpWord/Element/TextRunTest.php
index 59db597c..27f5af6b 100644
--- a/tests/PhpWord/Element/TextRunTest.php
+++ b/tests/PhpWord/Element/TextRunTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\PhpWord;
  *
  * @runTestsInSeparateProcesses
  */
-class TextRunTest extends \PHPUnit_Framework_TestCase
+class TextRunTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance
diff --git a/tests/PhpWord/Element/TextTest.php b/tests/PhpWord/Element/TextTest.php
index 9723a2e1..09027ad6 100644
--- a/tests/PhpWord/Element/TextTest.php
+++ b/tests/PhpWord/Element/TextTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\Style\Font;
  *
  * @runTestsInSeparateProcesses
  */
-class TextTest extends \PHPUnit_Framework_TestCase
+class TextTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * New instance
diff --git a/tests/PhpWord/Element/TitleTest.php b/tests/PhpWord/Element/TitleTest.php
index 500de133..3ea6242f 100644
--- a/tests/PhpWord/Element/TitleTest.php
+++ b/tests/PhpWord/Element/TitleTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Element;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\Title
  * @runTestsInSeparateProcesses
  */
-class TitleTest extends \PHPUnit_Framework_TestCase
+class TitleTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Create new instance
diff --git a/tests/PhpWord/Exception/CopyFileExceptionTest.php b/tests/PhpWord/Exception/CopyFileExceptionTest.php
index 9d921740..fa9949ed 100644
--- a/tests/PhpWord/Exception/CopyFileExceptionTest.php
+++ b/tests/PhpWord/Exception/CopyFileExceptionTest.php
@@ -21,7 +21,7 @@ namespace PhpOffice\PhpWord\Exception;
  * @covers \PhpOffice\PhpWord\Exception\CopyFileException
  * @coversDefaultClass \PhpOffice\PhpWord\Exception\CopyFileException
  */
-class CopyFileExceptionTest extends \PHPUnit_Framework_TestCase
+class CopyFileExceptionTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * CopyFileException can be thrown.
diff --git a/tests/PhpWord/Exception/CreateTemporaryFileExceptionTest.php b/tests/PhpWord/Exception/CreateTemporaryFileExceptionTest.php
index 91c7012f..6b4d14bf 100644
--- a/tests/PhpWord/Exception/CreateTemporaryFileExceptionTest.php
+++ b/tests/PhpWord/Exception/CreateTemporaryFileExceptionTest.php
@@ -21,7 +21,7 @@ namespace PhpOffice\PhpWord\Exception;
  * @covers \PhpOffice\PhpWord\Exception\CreateTemporaryFileException
  * @coversDefaultClass \PhpOffice\PhpWord\Exception\CreateTemporaryFileException
  */
-class CreateTemporaryFileExceptionTest extends \PHPUnit_Framework_TestCase
+class CreateTemporaryFileExceptionTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * CreateTemporaryFileException can be thrown.
diff --git a/tests/PhpWord/Exception/ExceptionTest.php b/tests/PhpWord/Exception/ExceptionTest.php
index 28b15702..255477f9 100644
--- a/tests/PhpWord/Exception/ExceptionTest.php
+++ b/tests/PhpWord/Exception/ExceptionTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Exception;
  * @coversDefaultClass \PhpOffice\PhpWord\Exception\Exception
  * @runTestsInSeparateProcesses
  */
-class ExceptionTest extends \PHPUnit_Framework_TestCase
+class ExceptionTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Throw new exception
diff --git a/tests/PhpWord/Exception/InvalidImageExceptionTest.php b/tests/PhpWord/Exception/InvalidImageExceptionTest.php
index dfaadbd7..c0285dc1 100644
--- a/tests/PhpWord/Exception/InvalidImageExceptionTest.php
+++ b/tests/PhpWord/Exception/InvalidImageExceptionTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Exception;
  * @coversDefaultClass \PhpOffice\PhpWord\Exception\InvalidImageException
  * @runTestsInSeparateProcesses
  */
-class InvalidImageExceptionTest extends \PHPUnit_Framework_TestCase
+class InvalidImageExceptionTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Throw new exception
diff --git a/tests/PhpWord/Exception/InvalidStyleExceptionTest.php b/tests/PhpWord/Exception/InvalidStyleExceptionTest.php
index 77ee8571..d516019f 100644
--- a/tests/PhpWord/Exception/InvalidStyleExceptionTest.php
+++ b/tests/PhpWord/Exception/InvalidStyleExceptionTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Exception;
  * @coversDefaultClass \PhpOffice\PhpWord\Exception\InvalidStyleException
  * @runTestsInSeparateProcesses
  */
-class InvalidStyleExceptionTest extends \PHPUnit_Framework_TestCase
+class InvalidStyleExceptionTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Throw new exception
diff --git a/tests/PhpWord/Exception/UnsupportedImageTypeExceptionTest.php b/tests/PhpWord/Exception/UnsupportedImageTypeExceptionTest.php
index 50b4806d..559d6341 100644
--- a/tests/PhpWord/Exception/UnsupportedImageTypeExceptionTest.php
+++ b/tests/PhpWord/Exception/UnsupportedImageTypeExceptionTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Exception;
  * @coversDefaultClass \PhpOffice\PhpWord\Exception\UnsupportedImageTypeExceptionTest
  * @runTestsInSeparateProcesses
  */
-class UnsupportedImageTypeExceptionTest extends \PHPUnit_Framework_TestCase
+class UnsupportedImageTypeExceptionTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Throw new exception
diff --git a/tests/PhpWord/IOFactoryTest.php b/tests/PhpWord/IOFactoryTest.php
index 6dbb006e..581b7d49 100644
--- a/tests/PhpWord/IOFactoryTest.php
+++ b/tests/PhpWord/IOFactoryTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord;
  *
  * @runTestsInSeparateProcesses
  */
-class IOFactoryTest extends \PHPUnit_Framework_TestCase
+class IOFactoryTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Create existing writer
diff --git a/tests/PhpWord/MediaTest.php b/tests/PhpWord/MediaTest.php
index d045abcd..ed56376b 100644
--- a/tests/PhpWord/MediaTest.php
+++ b/tests/PhpWord/MediaTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\Element\Image;
  *
  * @runTestsInSeparateProcesses
  */
-class MediaTest extends \PHPUnit_Framework_TestCase
+class MediaTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Get section media elements
diff --git a/tests/PhpWord/Metadata/DocInfoTest.php b/tests/PhpWord/Metadata/DocInfoTest.php
index 5443f0b2..01659773 100644
--- a/tests/PhpWord/Metadata/DocInfoTest.php
+++ b/tests/PhpWord/Metadata/DocInfoTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Metadata;
  *
  * @runTestsInSeparateProcesses
  */
-class DocInfoTest extends \PHPUnit_Framework_TestCase
+class DocInfoTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Creator
diff --git a/tests/PhpWord/Metadata/SettingsTest.php b/tests/PhpWord/Metadata/SettingsTest.php
index 6f493d04..bee8d0ca 100644
--- a/tests/PhpWord/Metadata/SettingsTest.php
+++ b/tests/PhpWord/Metadata/SettingsTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\SimpleType\Zoom;
  *
  * @runTestsInSeparateProcesses
  */
-class SettingsTest extends \PHPUnit_Framework_TestCase
+class SettingsTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * EvenAndOddHeaders
diff --git a/tests/PhpWord/PhpWordTest.php b/tests/PhpWord/PhpWordTest.php
index 01d7342e..f8a22459 100644
--- a/tests/PhpWord/PhpWordTest.php
+++ b/tests/PhpWord/PhpWordTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\Metadata\DocInfo;
  *
  * @runTestsInSeparateProcesses
  */
-class PhpWordTest extends \PHPUnit_Framework_TestCase
+class PhpWordTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test object creation
diff --git a/tests/PhpWord/Reader/HTMLTest.php b/tests/PhpWord/Reader/HTMLTest.php
index 24751cac..c56fc1fc 100644
--- a/tests/PhpWord/Reader/HTMLTest.php
+++ b/tests/PhpWord/Reader/HTMLTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\IOFactory;
  * @coversDefaultClass \PhpOffice\PhpWord\Reader\HTML
  * @runTestsInSeparateProcesses
  */
-class HTMLTest extends \PHPUnit_Framework_TestCase
+class HTMLTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test load
diff --git a/tests/PhpWord/Reader/MsDocTest.php b/tests/PhpWord/Reader/MsDocTest.php
index ed16e64b..12d50247 100644
--- a/tests/PhpWord/Reader/MsDocTest.php
+++ b/tests/PhpWord/Reader/MsDocTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\IOFactory;
  * @coversDefaultClass \PhpOffice\PhpWord\Reader\MsDoc
  * @runTestsInSeparateProcesses
  */
-class MsDocTest extends \PHPUnit_Framework_TestCase
+class MsDocTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test canRead() method
diff --git a/tests/PhpWord/Reader/ODTextTest.php b/tests/PhpWord/Reader/ODTextTest.php
index d00657de..7041e13e 100644
--- a/tests/PhpWord/Reader/ODTextTest.php
+++ b/tests/PhpWord/Reader/ODTextTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\IOFactory;
  * @coversDefaultClass \PhpOffice\PhpWord\Reader\ODText
  * @runTestsInSeparateProcesses
  */
-class ODTextTest extends \PHPUnit_Framework_TestCase
+class ODTextTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Load
diff --git a/tests/PhpWord/Reader/RTFTest.php b/tests/PhpWord/Reader/RTFTest.php
index 58154ee3..ca1f6ed4 100644
--- a/tests/PhpWord/Reader/RTFTest.php
+++ b/tests/PhpWord/Reader/RTFTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\IOFactory;
  * @coversDefaultClass \PhpOffice\PhpWord\Reader\RTF
  * @runTestsInSeparateProcesses
  */
-class RTFTest extends \PHPUnit_Framework_TestCase
+class RTFTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test load
diff --git a/tests/PhpWord/Reader/Word2007Test.php b/tests/PhpWord/Reader/Word2007Test.php
index 627bc66e..8b787247 100644
--- a/tests/PhpWord/Reader/Word2007Test.php
+++ b/tests/PhpWord/Reader/Word2007Test.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\IOFactory;
  * @coversDefaultClass \PhpOffice\PhpWord\Reader\Word2007
  * @runTestsInSeparateProcesses
  */
-class Word2007Test extends \PHPUnit_Framework_TestCase
+class Word2007Test extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test canRead() method
diff --git a/tests/PhpWord/SettingsTest.php b/tests/PhpWord/SettingsTest.php
index 6fd2f52b..d8752b2b 100644
--- a/tests/PhpWord/SettingsTest.php
+++ b/tests/PhpWord/SettingsTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord;
  * @coversDefaultClass \PhpOffice\PhpWord\Settings
  * @runTestsInSeparateProcesses
  */
-class SettingsTest extends \PHPUnit_Framework_TestCase
+class SettingsTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test set/get compatibity option
diff --git a/tests/PhpWord/Shared/ConverterTest.php b/tests/PhpWord/Shared/ConverterTest.php
index a2031787..a71046aa 100644
--- a/tests/PhpWord/Shared/ConverterTest.php
+++ b/tests/PhpWord/Shared/ConverterTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Shared;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Shared\Converter
  */
-class ConverterTest extends \PHPUnit_Framework_TestCase
+class ConverterTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test unit conversion functions with various numbers
diff --git a/tests/PhpWord/Shared/HtmlTest.php b/tests/PhpWord/Shared/HtmlTest.php
index 602b644d..0ba7717f 100644
--- a/tests/PhpWord/Shared/HtmlTest.php
+++ b/tests/PhpWord/Shared/HtmlTest.php
@@ -22,7 +22,7 @@ use PhpOffice\PhpWord\Element\Section;
 /**
  * Test class for PhpOffice\PhpWord\Shared\Html
  */
-class HtmlTest extends \PHPUnit_Framework_TestCase
+class HtmlTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test unit conversion functions with various numbers
diff --git a/tests/PhpWord/Shared/ZipArchiveTest.php b/tests/PhpWord/Shared/ZipArchiveTest.php
index 689f122b..91f0f030 100644
--- a/tests/PhpWord/Shared/ZipArchiveTest.php
+++ b/tests/PhpWord/Shared/ZipArchiveTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\Settings;
  * @coversDefaultClass \PhpOffice\PhpWord\Shared\ZipArchive
  * @runTestsInSeparateProcesses
  */
-class ZipArchiveTest extends \PHPUnit_Framework_TestCase
+class ZipArchiveTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test close method exception: Working in local, not working in Travis
diff --git a/tests/PhpWord/Style/AbstractStyleTest.php b/tests/PhpWord/Style/AbstractStyleTest.php
index ab3ea14e..d4291c2a 100644
--- a/tests/PhpWord/Style/AbstractStyleTest.php
+++ b/tests/PhpWord/Style/AbstractStyleTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Style;
  *
  * @runTestsInSeparateProcesses
  */
-class AbstractStyleTest extends \PHPUnit_Framework_TestCase
+class AbstractStyleTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test set style by array
diff --git a/tests/PhpWord/Style/CellTest.php b/tests/PhpWord/Style/CellTest.php
index 71b32a65..79b22ee1 100644
--- a/tests/PhpWord/Style/CellTest.php
+++ b/tests/PhpWord/Style/CellTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Style;
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Cell
  * @runTestsInSeparateProcesses
  */
-class CellTest extends \PHPUnit_Framework_TestCase
+class CellTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test setting style with normal value
diff --git a/tests/PhpWord/Style/FontTest.php b/tests/PhpWord/Style/FontTest.php
index a227d7f9..91bba97f 100644
--- a/tests/PhpWord/Style/FontTest.php
+++ b/tests/PhpWord/Style/FontTest.php
@@ -26,7 +26,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  *
  * @runTestsInSeparateProcesses
  */
-class FontTest extends \PHPUnit_Framework_TestCase
+class FontTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Tear down after each test
diff --git a/tests/PhpWord/Style/ImageTest.php b/tests/PhpWord/Style/ImageTest.php
index decc13b1..5d9e5568 100644
--- a/tests/PhpWord/Style/ImageTest.php
+++ b/tests/PhpWord/Style/ImageTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\SimpleType\Jc;
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Image
  * @runTestsInSeparateProcesses
  */
-class ImageTest extends \PHPUnit_Framework_TestCase
+class ImageTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test setting style with normal value
diff --git a/tests/PhpWord/Style/IndentationTest.php b/tests/PhpWord/Style/IndentationTest.php
index db079704..63a96628 100644
--- a/tests/PhpWord/Style/IndentationTest.php
+++ b/tests/PhpWord/Style/IndentationTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Style;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Indentation
  */
-class IndentationTest extends \PHPUnit_Framework_TestCase
+class IndentationTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test get/set
diff --git a/tests/PhpWord/Style/LanguageTest.php b/tests/PhpWord/Style/LanguageTest.php
index 35a01e07..74b2067a 100644
--- a/tests/PhpWord/Style/LanguageTest.php
+++ b/tests/PhpWord/Style/LanguageTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Style;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Language
  */
-class LanguageTest extends \PHPUnit_Framework_TestCase
+class LanguageTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test get/set
diff --git a/tests/PhpWord/Style/LineNumberingTest.php b/tests/PhpWord/Style/LineNumberingTest.php
index 56440529..9ec1e3b7 100644
--- a/tests/PhpWord/Style/LineNumberingTest.php
+++ b/tests/PhpWord/Style/LineNumberingTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Style;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Style\LineNumbering
  */
-class LineNumberingTest extends \PHPUnit_Framework_TestCase
+class LineNumberingTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test get/set
diff --git a/tests/PhpWord/Style/LineTest.php b/tests/PhpWord/Style/LineTest.php
index 21489caf..ab77b328 100644
--- a/tests/PhpWord/Style/LineTest.php
+++ b/tests/PhpWord/Style/LineTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Style;
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Image
  * @runTestsInSeparateProcesses
  */
-class LineTest extends \PHPUnit_Framework_TestCase
+class LineTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test setting style with normal value
diff --git a/tests/PhpWord/Style/ListItemTest.php b/tests/PhpWord/Style/ListItemTest.php
index a2e4eb74..a8155fa3 100644
--- a/tests/PhpWord/Style/ListItemTest.php
+++ b/tests/PhpWord/Style/ListItemTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Style;
  * @coversDefaultClass \PhpOffice\PhpWord\Style\ListItem
  * @runTestsInSeparateProcesses
  */
-class ListItemTest extends \PHPUnit_Framework_TestCase
+class ListItemTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test construct
diff --git a/tests/PhpWord/Style/NumberingLevelTest.php b/tests/PhpWord/Style/NumberingLevelTest.php
index 402d936b..9b512eb0 100644
--- a/tests/PhpWord/Style/NumberingLevelTest.php
+++ b/tests/PhpWord/Style/NumberingLevelTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\SimpleType\Jc;
  *
  * @runTestsInSeparateProcesses
  */
-class NumberingLevelTest extends \PHPUnit_Framework_TestCase
+class NumberingLevelTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test setting style with normal value
diff --git a/tests/PhpWord/Style/NumberingTest.php b/tests/PhpWord/Style/NumberingTest.php
index ad57ebff..0103c503 100644
--- a/tests/PhpWord/Style/NumberingTest.php
+++ b/tests/PhpWord/Style/NumberingTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Style;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Numbering
  */
-class NumberingTest extends \PHPUnit_Framework_TestCase
+class NumberingTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test get/set
diff --git a/tests/PhpWord/Style/PaperTest.php b/tests/PhpWord/Style/PaperTest.php
index 7d12410c..687e23c6 100644
--- a/tests/PhpWord/Style/PaperTest.php
+++ b/tests/PhpWord/Style/PaperTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  *
  * @runTestsInSeparateProcesses
  */
-class PaperTest extends \PHPUnit_Framework_TestCase
+class PaperTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Tear down after each test
diff --git a/tests/PhpWord/Style/ParagraphTest.php b/tests/PhpWord/Style/ParagraphTest.php
index e28f54c7..48acc600 100644
--- a/tests/PhpWord/Style/ParagraphTest.php
+++ b/tests/PhpWord/Style/ParagraphTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  *
  * @runTestsInSeparateProcesses
  */
-class ParagraphTest extends \PHPUnit_Framework_TestCase
+class ParagraphTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Tear down after each test
diff --git a/tests/PhpWord/Style/RowTest.php b/tests/PhpWord/Style/RowTest.php
index db98d0a9..2daad7ea 100644
--- a/tests/PhpWord/Style/RowTest.php
+++ b/tests/PhpWord/Style/RowTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Style;
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Row
  * @runTestsInSeparateProcesses
  */
-class RowTest extends \PHPUnit_Framework_TestCase
+class RowTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test properties with boolean value
diff --git a/tests/PhpWord/Style/SectionTest.php b/tests/PhpWord/Style/SectionTest.php
index 89c4640a..c9b7003f 100644
--- a/tests/PhpWord/Style/SectionTest.php
+++ b/tests/PhpWord/Style/SectionTest.php
@@ -23,7 +23,7 @@ namespace PhpOffice\PhpWord\Style;
  * @coversDefaultClass \PhpOffice\PhpWord\Element\Section
  * @runTestsInSeparateProcesses
  */
-class SectionTest extends \PHPUnit_Framework_TestCase
+class SectionTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Executed before each method of the class
diff --git a/tests/PhpWord/Style/ShadingTest.php b/tests/PhpWord/Style/ShadingTest.php
index fd0aaf5e..ab991a57 100644
--- a/tests/PhpWord/Style/ShadingTest.php
+++ b/tests/PhpWord/Style/ShadingTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Style;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Shading
  */
-class ShadingTest extends \PHPUnit_Framework_TestCase
+class ShadingTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test get/set
diff --git a/tests/PhpWord/Style/SpacingTest.php b/tests/PhpWord/Style/SpacingTest.php
index f147ae61..2c26f68b 100644
--- a/tests/PhpWord/Style/SpacingTest.php
+++ b/tests/PhpWord/Style/SpacingTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Style;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Spacing
  */
-class SpacingTest extends \PHPUnit_Framework_TestCase
+class SpacingTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test get/set
diff --git a/tests/PhpWord/Style/TOCTest.php b/tests/PhpWord/Style/TOCTest.php
index ec01acd9..5981b00c 100644
--- a/tests/PhpWord/Style/TOCTest.php
+++ b/tests/PhpWord/Style/TOCTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Style;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Style\TOC
  */
-class TOCTest extends \PHPUnit_Framework_TestCase
+class TOCTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test get/set
diff --git a/tests/PhpWord/Style/TabTest.php b/tests/PhpWord/Style/TabTest.php
index 8102369d..c11f0558 100644
--- a/tests/PhpWord/Style/TabTest.php
+++ b/tests/PhpWord/Style/TabTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord\Style;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Tab
  */
-class TabTest extends \PHPUnit_Framework_TestCase
+class TabTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test get/set
diff --git a/tests/PhpWord/Style/TableTest.php b/tests/PhpWord/Style/TableTest.php
index ee020dd9..ff813927 100644
--- a/tests/PhpWord/Style/TableTest.php
+++ b/tests/PhpWord/Style/TableTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\SimpleType\JcTable;
  *
  * @runTestsInSeparateProcesses
  */
-class TableTest extends \PHPUnit_Framework_TestCase
+class TableTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test class construction
diff --git a/tests/PhpWord/Style/TextBoxTest.php b/tests/PhpWord/Style/TextBoxTest.php
index a91b5b28..5a6bc76f 100644
--- a/tests/PhpWord/Style/TextBoxTest.php
+++ b/tests/PhpWord/Style/TextBoxTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\SimpleType\Jc;
  * @coversDefaultClass \PhpOffice\PhpWord\Style\Image
  * @runTestsInSeparateProcesses
  */
-class TextBoxTest extends \PHPUnit_Framework_TestCase
+class TextBoxTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test setting style with normal value
diff --git a/tests/PhpWord/StyleTest.php b/tests/PhpWord/StyleTest.php
index aa46c6b1..6f2f0980 100644
--- a/tests/PhpWord/StyleTest.php
+++ b/tests/PhpWord/StyleTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\SimpleType\Jc;
  * @coversDefaultClass \PhpOffice\PhpWord\Style
  * @runTestsInSeparateProcesses
  */
-class StyleTest extends \PHPUnit_Framework_TestCase
+class StyleTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Add and get paragraph, font, link, title, and table styles
diff --git a/tests/PhpWord/TemplateProcessorTest.php b/tests/PhpWord/TemplateProcessorTest.php
index 4bf69f5a..7b064ef7 100644
--- a/tests/PhpWord/TemplateProcessorTest.php
+++ b/tests/PhpWord/TemplateProcessorTest.php
@@ -22,7 +22,7 @@ namespace PhpOffice\PhpWord;
  * @coversDefaultClass \PhpOffice\PhpWord\TemplateProcessor
  * @runTestsInSeparateProcesses
  */
-final class TemplateProcessorTest extends \PHPUnit_Framework_TestCase
+final class TemplateProcessorTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Template can be saved in temporary location.
diff --git a/tests/PhpWord/Writer/HTML/ElementTest.php b/tests/PhpWord/Writer/HTML/ElementTest.php
index 0778650e..86856d5c 100644
--- a/tests/PhpWord/Writer/HTML/ElementTest.php
+++ b/tests/PhpWord/Writer/HTML/ElementTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\Writer\HTML\Element\Text;
 /**
  * Test class for PhpOffice\PhpWord\Writer\HTML\Element subnamespace
  */
-class ElementTest extends \PHPUnit_Framework_TestCase
+class ElementTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test unmatched elements
diff --git a/tests/PhpWord/Writer/HTML/PartTest.php b/tests/PhpWord/Writer/HTML/PartTest.php
index a4a6264e..3d56f983 100644
--- a/tests/PhpWord/Writer/HTML/PartTest.php
+++ b/tests/PhpWord/Writer/HTML/PartTest.php
@@ -22,7 +22,7 @@ use PhpOffice\PhpWord\Writer\HTML\Part\Body;
 /**
  * Test class for PhpOffice\PhpWord\Writer\HTML\Part subnamespace
  */
-class PartTest extends \PHPUnit_Framework_TestCase
+class PartTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test get parent writer exception
diff --git a/tests/PhpWord/Writer/HTML/StyleTest.php b/tests/PhpWord/Writer/HTML/StyleTest.php
index 7548ff02..e9117de9 100644
--- a/tests/PhpWord/Writer/HTML/StyleTest.php
+++ b/tests/PhpWord/Writer/HTML/StyleTest.php
@@ -20,7 +20,7 @@ namespace PhpOffice\PhpWord\Writer\HTML;
 /**
  * Test class for PhpOffice\PhpWord\Writer\HTML\Style subnamespace
  */
-class StyleTest extends \PHPUnit_Framework_TestCase
+class StyleTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test empty styles
diff --git a/tests/PhpWord/Writer/HTMLTest.php b/tests/PhpWord/Writer/HTMLTest.php
index 69cd5a97..4d75ea5a 100644
--- a/tests/PhpWord/Writer/HTMLTest.php
+++ b/tests/PhpWord/Writer/HTMLTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\SimpleType\Jc;
  *
  * @runTestsInSeparateProcesses
  */
-class HTMLTest extends \PHPUnit_Framework_TestCase
+class HTMLTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Construct
diff --git a/tests/PhpWord/Writer/ODText/ElementTest.php b/tests/PhpWord/Writer/ODText/ElementTest.php
index ef4e68b0..253c8e11 100644
--- a/tests/PhpWord/Writer/ODText/ElementTest.php
+++ b/tests/PhpWord/Writer/ODText/ElementTest.php
@@ -22,7 +22,7 @@ use PhpOffice\Common\XMLWriter;
 /**
  * Test class for PhpOffice\PhpWord\Writer\ODText\Element subnamespace
  */
-class ElementTest extends \PHPUnit_Framework_TestCase
+class ElementTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test unmatched elements
diff --git a/tests/PhpWord/Writer/ODText/Part/AbstractPartTest.php b/tests/PhpWord/Writer/ODText/Part/AbstractPartTest.php
index 5ca980f2..f91e6dd2 100644
--- a/tests/PhpWord/Writer/ODText/Part/AbstractPartTest.php
+++ b/tests/PhpWord/Writer/ODText/Part/AbstractPartTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\Writer\ODText;
  * @coversDefaultClass \PhpOffice\PhpWord\Writer\ODText\Part\AbstractPart
  * @runTestsInSeparateProcesses
  */
-class AbstractPartTest extends \PHPUnit_Framework_TestCase
+class AbstractPartTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * covers   ::setParentWriter
diff --git a/tests/PhpWord/Writer/ODText/Part/ContentTest.php b/tests/PhpWord/Writer/ODText/Part/ContentTest.php
index 048c5242..28542379 100644
--- a/tests/PhpWord/Writer/ODText/Part/ContentTest.php
+++ b/tests/PhpWord/Writer/ODText/Part/ContentTest.php
@@ -27,7 +27,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  * @coversDefaultClass \PhpOffice\PhpWord\Writer\ODText\Part\Content
  * @runTestsInSeparateProcesses
  */
-class ContentTest extends \PHPUnit_Framework_TestCase
+class ContentTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Executed before each method of the class
diff --git a/tests/PhpWord/Writer/ODText/StyleTest.php b/tests/PhpWord/Writer/ODText/StyleTest.php
index 1a0c3ccd..5bd862f9 100644
--- a/tests/PhpWord/Writer/ODText/StyleTest.php
+++ b/tests/PhpWord/Writer/ODText/StyleTest.php
@@ -22,7 +22,7 @@ use PhpOffice\Common\XMLWriter;
 /**
  * Test class for PhpOffice\PhpWord\Writer\ODText\Style subnamespace
  */
-class StyleTest extends \PHPUnit_Framework_TestCase
+class StyleTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test empty styles
diff --git a/tests/PhpWord/Writer/ODTextTest.php b/tests/PhpWord/Writer/ODTextTest.php
index d35a4ec7..bb1b9538 100644
--- a/tests/PhpWord/Writer/ODTextTest.php
+++ b/tests/PhpWord/Writer/ODTextTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\SimpleType\Jc;
  *
  * @runTestsInSeparateProcesses
  */
-class ODTextTest extends \PHPUnit_Framework_TestCase
+class ODTextTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Construct
diff --git a/tests/PhpWord/Writer/PDF/DomPDFTest.php b/tests/PhpWord/Writer/PDF/DomPDFTest.php
index 7831f472..61c3d296 100644
--- a/tests/PhpWord/Writer/PDF/DomPDFTest.php
+++ b/tests/PhpWord/Writer/PDF/DomPDFTest.php
@@ -26,7 +26,7 @@ use PhpOffice\PhpWord\Writer\PDF;
  *
  * @runTestsInSeparateProcesses
  */
-class DomPDFTest extends \PHPUnit_Framework_TestCase
+class DomPDFTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test construct
diff --git a/tests/PhpWord/Writer/PDF/MPDFTest.php b/tests/PhpWord/Writer/PDF/MPDFTest.php
index 62411b97..0e6cf308 100644
--- a/tests/PhpWord/Writer/PDF/MPDFTest.php
+++ b/tests/PhpWord/Writer/PDF/MPDFTest.php
@@ -26,7 +26,7 @@ use PhpOffice\PhpWord\Writer\PDF;
  *
  * @runTestsInSeparateProcesses
  */
-class MPDFTest extends \PHPUnit_Framework_TestCase
+class MPDFTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test construct
diff --git a/tests/PhpWord/Writer/PDF/TCPDFTest.php b/tests/PhpWord/Writer/PDF/TCPDFTest.php
index d5bd534b..e697eee1 100644
--- a/tests/PhpWord/Writer/PDF/TCPDFTest.php
+++ b/tests/PhpWord/Writer/PDF/TCPDFTest.php
@@ -26,7 +26,7 @@ use PhpOffice\PhpWord\Writer\PDF;
  *
  * @runTestsInSeparateProcesses
  */
-class TCPDFTest extends \PHPUnit_Framework_TestCase
+class TCPDFTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test construct
diff --git a/tests/PhpWord/Writer/PDFTest.php b/tests/PhpWord/Writer/PDFTest.php
index f1a908a9..a7ca9f68 100644
--- a/tests/PhpWord/Writer/PDFTest.php
+++ b/tests/PhpWord/Writer/PDFTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\Settings;
  *
  * @runTestsInSeparateProcesses
  */
-class PDFTest extends \PHPUnit_Framework_TestCase
+class PDFTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test normal construct
diff --git a/tests/PhpWord/Writer/RTF/ElementTest.php b/tests/PhpWord/Writer/RTF/ElementTest.php
index 17a9c22f..e85d2091 100644
--- a/tests/PhpWord/Writer/RTF/ElementTest.php
+++ b/tests/PhpWord/Writer/RTF/ElementTest.php
@@ -22,7 +22,7 @@ use PhpOffice\PhpWord\Writer\RTF;
 /**
  * Test class for PhpOffice\PhpWord\Writer\RTF\Element subnamespace
  */
-class ElementTest extends \PHPUnit_Framework_TestCase
+class ElementTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test unmatched elements
diff --git a/tests/PhpWord/Writer/RTF/StyleTest.php b/tests/PhpWord/Writer/RTF/StyleTest.php
index 4e3a0eed..b9dc7b45 100644
--- a/tests/PhpWord/Writer/RTF/StyleTest.php
+++ b/tests/PhpWord/Writer/RTF/StyleTest.php
@@ -20,7 +20,7 @@ namespace PhpOffice\PhpWord\Writer\RTF;
 /**
  * Test class for PhpOffice\PhpWord\Writer\RTF\Style subnamespace
  */
-class StyleTest extends \PHPUnit_Framework_TestCase
+class StyleTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test empty styles
diff --git a/tests/PhpWord/Writer/RTFTest.php b/tests/PhpWord/Writer/RTFTest.php
index ec83f7b1..f4442043 100644
--- a/tests/PhpWord/Writer/RTFTest.php
+++ b/tests/PhpWord/Writer/RTFTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\SimpleType\Jc;
  *
  * @runTestsInSeparateProcesses
  */
-class RTFTest extends \PHPUnit_Framework_TestCase
+class RTFTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Construct
diff --git a/tests/PhpWord/Writer/Word2007/ElementTest.php b/tests/PhpWord/Writer/Word2007/ElementTest.php
index dc3d30bd..85a9bb38 100644
--- a/tests/PhpWord/Writer/Word2007/ElementTest.php
+++ b/tests/PhpWord/Writer/Word2007/ElementTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
 /**
  * Test class for PhpOffice\PhpWord\Writer\Word2007\Element subnamespace
  */
-class ElementTest extends \PHPUnit_Framework_TestCase
+class ElementTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Executed before each method of the class
diff --git a/tests/PhpWord/Writer/Word2007/Part/AbstractPartTest.php b/tests/PhpWord/Writer/Word2007/Part/AbstractPartTest.php
index 47f65861..7796c02c 100644
--- a/tests/PhpWord/Writer/Word2007/Part/AbstractPartTest.php
+++ b/tests/PhpWord/Writer/Word2007/Part/AbstractPartTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\Writer\Word2007;
  * @coversDefaultClass \PhpOffice\PhpWord\Writer\Word2007\Part\AbstractWriterPart
  * @runTestsInSeparateProcesses
  */
-class AbstractPartTest extends \PHPUnit_Framework_TestCase
+class AbstractPartTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * covers   ::setParentWriter
diff --git a/tests/PhpWord/Writer/Word2007/Part/CommentsTest.php b/tests/PhpWord/Writer/Word2007/Part/CommentsTest.php
index 4a4fd308..83af284f 100644
--- a/tests/PhpWord/Writer/Word2007/Part/CommentsTest.php
+++ b/tests/PhpWord/Writer/Word2007/Part/CommentsTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  *
  * @runTestsInSeparateProcesses
  */
-class CommentsTest extends \PHPUnit_Framework_TestCase
+class CommentsTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Executed before each method of the class
diff --git a/tests/PhpWord/Writer/Word2007/Part/DocumentTest.php b/tests/PhpWord/Writer/Word2007/Part/DocumentTest.php
index d194814c..9bad19fe 100644
--- a/tests/PhpWord/Writer/Word2007/Part/DocumentTest.php
+++ b/tests/PhpWord/Writer/Word2007/Part/DocumentTest.php
@@ -29,7 +29,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  *
  * @runTestsInSeparateProcesses
  */
-class DocumentTest extends \PHPUnit_Framework_TestCase
+class DocumentTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Executed before each method of the class
diff --git a/tests/PhpWord/Writer/Word2007/Part/FooterTest.php b/tests/PhpWord/Writer/Word2007/Part/FooterTest.php
index 98fb003e..82bb7b7d 100644
--- a/tests/PhpWord/Writer/Word2007/Part/FooterTest.php
+++ b/tests/PhpWord/Writer/Word2007/Part/FooterTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\Writer\Word2007;
  * @coversDefaultClass \PhpOffice\PhpWord\Writer\Word2007\Part\Footer
  * @runTestsInSeparateProcesses
  */
-class FooterTest extends \PHPUnit_Framework_TestCase
+class FooterTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Write footer
diff --git a/tests/PhpWord/Writer/Word2007/Part/FootnotesTest.php b/tests/PhpWord/Writer/Word2007/Part/FootnotesTest.php
index e557d9c2..3d11174a 100644
--- a/tests/PhpWord/Writer/Word2007/Part/FootnotesTest.php
+++ b/tests/PhpWord/Writer/Word2007/Part/FootnotesTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  * @coversNothing
  * @runTestsInSeparateProcesses
  */
-class FootnotesTest extends \PHPUnit_Framework_TestCase
+class FootnotesTest extends \PHPUnit\Framework\TestCase
 {
     public function tearDown()
     {
diff --git a/tests/PhpWord/Writer/Word2007/Part/HeaderTest.php b/tests/PhpWord/Writer/Word2007/Part/HeaderTest.php
index 7830469c..afa81cf9 100644
--- a/tests/PhpWord/Writer/Word2007/Part/HeaderTest.php
+++ b/tests/PhpWord/Writer/Word2007/Part/HeaderTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\Writer\Word2007;
  *
  * @runTestsInSeparateProcesses
  */
-class HeaderTest extends \PHPUnit_Framework_TestCase
+class HeaderTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Write header
diff --git a/tests/PhpWord/Writer/Word2007/Part/NumberingTest.php b/tests/PhpWord/Writer/Word2007/Part/NumberingTest.php
index 0f1ae523..62127e29 100644
--- a/tests/PhpWord/Writer/Word2007/Part/NumberingTest.php
+++ b/tests/PhpWord/Writer/Word2007/Part/NumberingTest.php
@@ -29,7 +29,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  * @runTestsInSeparateProcesses
  * @since 0.10.0
  */
-class NumberingTest extends \PHPUnit_Framework_TestCase
+class NumberingTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Executed before each method of the class
diff --git a/tests/PhpWord/Writer/Word2007/Part/SettingsTest.php b/tests/PhpWord/Writer/Word2007/Part/SettingsTest.php
index 5b812a0f..6af86696 100644
--- a/tests/PhpWord/Writer/Word2007/Part/SettingsTest.php
+++ b/tests/PhpWord/Writer/Word2007/Part/SettingsTest.php
@@ -30,7 +30,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  *
  * @coversDefaultClass \PhpOffice\PhpWord\Writer\Word2007\Part\Settings
  */
-class SettingsTest extends \PHPUnit_Framework_TestCase
+class SettingsTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Executed before each method of the class
diff --git a/tests/PhpWord/Writer/Word2007/Part/StylesTest.php b/tests/PhpWord/Writer/Word2007/Part/StylesTest.php
index cba0bfb3..0cdb444e 100644
--- a/tests/PhpWord/Writer/Word2007/Part/StylesTest.php
+++ b/tests/PhpWord/Writer/Word2007/Part/StylesTest.php
@@ -29,7 +29,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  * @coversDefaultClass \PhpOffice\PhpWord\Writer\Word2007\Part\Styles
  * @runTestsInSeparateProcesses
  */
-class StylesTest extends \PHPUnit_Framework_TestCase
+class StylesTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Executed before each method of the class
diff --git a/tests/PhpWord/Writer/Word2007/PartTest.php b/tests/PhpWord/Writer/Word2007/PartTest.php
index 3261db4f..160bf553 100644
--- a/tests/PhpWord/Writer/Word2007/PartTest.php
+++ b/tests/PhpWord/Writer/Word2007/PartTest.php
@@ -24,7 +24,7 @@ use PhpOffice\PhpWord\Writer\Word2007\Part\RelsPart;
  *
  * Covers miscellaneous tests
  */
-class PartTest extends \PHPUnit_Framework_TestCase
+class PartTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test exception when no type or target assigned to a relation
diff --git a/tests/PhpWord/Writer/Word2007/Style/FontTest.php b/tests/PhpWord/Writer/Word2007/Style/FontTest.php
index f406bc05..78b2c320 100644
--- a/tests/PhpWord/Writer/Word2007/Style/FontTest.php
+++ b/tests/PhpWord/Writer/Word2007/Style/FontTest.php
@@ -25,7 +25,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  * @coversDefaultClass \PhpOffice\PhpWord\Writer\Word2007\Style\Font
  * @runTestsInSeparateProcesses
  */
-class FontTest extends \PHPUnit_Framework_TestCase
+class FontTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Executed before each method of the class
diff --git a/tests/PhpWord/Writer/Word2007/StyleTest.php b/tests/PhpWord/Writer/Word2007/StyleTest.php
index 05785b0c..f48597d2 100644
--- a/tests/PhpWord/Writer/Word2007/StyleTest.php
+++ b/tests/PhpWord/Writer/Word2007/StyleTest.php
@@ -22,7 +22,7 @@ use PhpOffice\Common\XMLWriter;
 /**
  * Test class for PhpOffice\PhpWord\Writer\Word2007\Style subnamespace
  */
-class StyleTest extends \PHPUnit_Framework_TestCase
+class StyleTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * Test empty styles
diff --git a/tests/PhpWord/Writer/Word2007Test.php b/tests/PhpWord/Writer/Word2007Test.php
index 88a522a9..3e1edb39 100644
--- a/tests/PhpWord/Writer/Word2007Test.php
+++ b/tests/PhpWord/Writer/Word2007Test.php
@@ -26,7 +26,7 @@ use PhpOffice\PhpWord\TestHelperDOCX;
  *
  * @runTestsInSeparateProcesses
  */
-class Word2007Test extends \PHPUnit_Framework_TestCase
+class Word2007Test extends \PHPUnit\Framework\TestCase
 {
     /**
      * Tear down after each test