diff --git a/.travis.yml b/.travis.yml
index b39e8f4..8ed4144 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,6 +24,7 @@ before_script:
   # Install composer dependencies
   - composer validate
   - composer require --no-update silverstripe/recipe-core:^1.0
+  - composer require --no-update phpunit/phpunit:^5.7
   - if [[ $DB == PGSQL ]]; then composer require silverstripe/postgresql:2.0.x-dev --prefer-dist; fi
   - if [[ $DB == SQLITE ]]; then composer require silverstripe/sqlite3:2.1.x-dev --prefer-dist; fi
   - composer install --prefer-dist --no-interaction --no-progress --no-suggest --optimize-autoloader --verbose --profile