diff --git a/.travis.yml b/.travis.yml
index 6e51088..ecdc289 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,11 +2,11 @@ sudo: false
 
 language: php
 php:
-  - 5.3
-  - 5.4
   - 5.5
   - 5.6
+  - 7.0
   - 7.1
+  - 7.2
 
 cache:
   directories:
@@ -15,3 +15,5 @@ cache:
 install:
   - composer install --prefer-dist
 
+script:
+  - php vendor/bin/phpunit
diff --git a/Spreadsheet/Excel/Writer/Workbook.php b/Spreadsheet/Excel/Writer/Workbook.php
index 4c9e525..3c779ec 100644
--- a/Spreadsheet/Excel/Writer/Workbook.php
+++ b/Spreadsheet/Excel/Writer/Workbook.php
@@ -39,6 +39,10 @@ if (!class_exists('Spreadsheet_Excel_Writer_BIFFwriter')) {
     require_once 'Spreadsheet/Excel/Writer/Parser.php';
 }
 
+if (!class_exists('OLE')) {
+    require_once 'OLE.php';
+}
+
 if (!class_exists('OLE_PPS_Root')) {
     require_once 'OLE/PPS/Root.php';
 }
diff --git a/composer.json b/composer.json
index df6faed..98fc7ce 100644
--- a/composer.json
+++ b/composer.json
@@ -51,8 +51,8 @@
     "type": "library",
     "require": {
         "pear/pear-core-minimal": "^1.10",
-        "pear/ole": "*",
-        "php": ">=5.3.3"
+        "pear/ole": ">=1.0.0RC3",
+        "php": ">=5.3.3 <7.3"
     },
     "require-dev": {
         "phpunit/phpunit": "<6.0"
diff --git a/test/Test/Spreadsheet/Excel/Writer/WorkbookTest.php b/test/Test/Spreadsheet/Excel/Writer/WorkbookTest.php
index a7416ef..301c4c9 100644
--- a/test/Test/Spreadsheet/Excel/Writer/WorkbookTest.php
+++ b/test/Test/Spreadsheet/Excel/Writer/WorkbookTest.php
@@ -6,6 +6,12 @@
  */
 class Test_Spreadsheet_Excel_Writer_WorkbookTest extends Test_Spreadsheet_Excel_WriterTestCase
 {
+    public static function setUpBeforeClass()
+    {
+        // Preload constants from OLE
+        @class_exists(OLE::class);
+    }
+
     public function testSetVersion()
     {
         $workbook = $this->getNewWorkbook();