diff --git a/.travis.yml b/.travis.yml
index de362b7..8cc43e5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -41,7 +41,7 @@ matrix:
 before_script:
   - composer selfupdate
   - composer config -g github-oauth.github.com $GITHUB_OAUTH_TOKEN
-  - composer global require phpunit/phpunit --no-update
+  - composer global require phpunit/phpunit:4.* --no-update
   - composer global update --prefer-dist --no-interaction
   - if [ "$SYMFONY_VERSION" != "" ]; then composer require "symfony/symfony:${SYMFONY_VERSION}" --no-update; fi;
   - composer update --prefer-dist --no-interaction $COMPOSER_FLAGS