diff --git a/.travis.yml b/.travis.yml
index bc905319..6b87c31e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,6 @@ php:
   - '7.2'
 
 install:
-  - travis_retry composer install --no-interaction --prefer-source --dev
+  - travis_retry composer install --no-interaction --dev
 
 script: vendor/bin/phpunit
\ No newline at end of file