diff --git a/.travis.yml b/.travis.yml
index 56c3327d1..c03120150 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,10 +19,10 @@ before_script:
  - echo "extension=pthreads.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
 
 script:
- - composer install
+ - composer install --prefer-dist
  - ./vendor/bin/phpstan analyze --no-progress --memory-limit=2G
  - ./vendor/bin/phpunit --bootstrap vendor/autoload.php --fail-on-warning tests/phpunit
- - composer install --no-dev
+ - composer install --no-dev --prefer-dist
  - ./tests/travis.sh -t4
 
 cache: