diff --git a/.travis.yml b/.travis.yml
index da820c6..7980e45 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ language: php
 php:
   - 7.0
   - 7.1
+  - 7.2
 
 # This triggers builds to run on the new TravisCI infrastructure.
 # See: http://docs.travis-ci.com/user/workers/container-based-infrastructure/
diff --git a/composer.json b/composer.json
index db150b4..d1f6d28 100644
--- a/composer.json
+++ b/composer.json
@@ -35,7 +35,7 @@
         "psr/log": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit" : ">=5.4.3",
+        "phpunit/phpunit": "^6.5",
         "squizlabs/php_codesniffer": "^2.3"
     },
     "suggest": {