diff --git a/.travis.yml b/.travis.yml
index 4ecea54..939aa05 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,8 +9,13 @@ php:
 
 sudo: false
 
+cache:
+    directories:
+        - vendor
+        - $HOME/.composer/cache
+
 install:
-  - travis_retry composer install --no-interaction --prefer-source
+  - travis_retry composer install --no-interaction
 
 script:
   - if [ "$TRAVIS_PHP_VERSION" != "5.5.9" ] && [ "$TRAVIS_PHP_VERSION" != "5.5" ] && [ "$TRAVIS_PHP_VERSION" != "5.6" ]; then vendor/bin/phpunit; fi