diff --git a/.travis.yml b/.travis.yml
index f811759..e8904be 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ cache:
 
 before_script:
   - travis_retry composer self-update
-  - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-source
+  - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-dist
   - node tests/server.js &
 
 script: