diff --git a/.travis.yml b/.travis.yml
index 6953fe7..4557d2c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: php
 php:
-  - "5.5"
+  - "5.6"
 
 before_script:
   - wget http://getcomposer.org/composer.phar
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4278cda
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,4 @@
+install:
+	composer install
+test:
+	./vendor/phpunit/phpunit/phpunit -c phpunit.xml
diff --git a/composer.json b/composer.json
index 8ef0562..7da30b2 100644
--- a/composer.json
+++ b/composer.json
@@ -16,5 +16,6 @@
         }
     },
     "require": {
+        "phpunit/phpunit": "5.7.*"
     }
 }