diff --git a/.travis.yml b/.travis.yml
index 9b6be442..250a3e3b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,8 +13,8 @@ matrix:
 before_script:
     - composer self-update
     - composer require satooshi/php-coveralls:dev-master --no-update --dev
-    - composer install --prefer-source
-    - cd examples/relational && composer install
+    - composer install --prefer-dist
+    - cd examples/relational && composer install --prefer-dist
     - php config/init.php
     - php -S localhost:8000 &
     - sleep 3