diff --git a/.travis.yml b/.travis.yml
index 2cf921c..43e88c6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,3 @@
-sudo: false
-
 language: php
 php:
   - 5.6
@@ -19,5 +17,8 @@ install:
   - mkdir -p build/cache
 
 script:
-  - php vendor/bin/phpunit
+  - php vendor/bin/phpunit --coverage-clover build/logs/clover.xml
   - vendor/bin/php-cs-fixer --cache-file=build/cache/.php_cs.cache --diff --dry-run --stop-on-violation --verbose fix
+
+after_success:
+  - travis_retry php vendor/bin/php-coveralls
diff --git a/README.md b/README.md
index e609286..f7f0df1 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
 [![Build Status](https://travis-ci.org/pear/Spreadsheet_Excel_Writer.svg?branch=master)](https://travis-ci.org/pear/Spreadsheet_Excel_Writer)
 [![Latest Stable Version](https://poser.pugx.org/pear/spreadsheet_excel_writer/v/stable)](https://packagist.org/packages/pear/spreadsheet_excel_writer)
+[![Coverage Status](https://coveralls.io/repos/github/pear/Spreadsheet_Excel_Writer/badge.svg?branch=master)](https://coveralls.io/github/pear/Spreadsheet_Excel_Writer?branch=master)
 
 This package is [Spreadsheet_Excel_Writer](http://pear.php.net/package/Spreadsheet_Excel_Writer) and has been migrated from [svn.php.net](https://svn.php.net/repository/pear/packages/Spreadsheet_Excel_Writer).
 
diff --git a/composer.json b/composer.json
index e3ab9b7..658ae96 100644
--- a/composer.json
+++ b/composer.json
@@ -36,8 +36,9 @@
         "pear/pear-core-minimal": "^1.10"
     },
     "require-dev": {
-        "phpunit/phpunit": "<6.0",
-        "friendsofphp/php-cs-fixer": "^2.16"
+        "friendsofphp/php-cs-fixer": "^2.16",
+        "php-coveralls/php-coveralls": "^2.2",
+        "phpunit/phpunit": "<6.0"
     },
     "autoload": {
         "psr-0": {