diff --git a/.travis.yml b/.travis.yml
index 69c32007c..6ced32182 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -34,7 +34,10 @@ matrix:
 cache:
   directories:
     - $HOME/.cache/pip
+    # Cache directory for older Composer versions.
     - $HOME/.composer/cache/files
+    # Cache directory for more recent Composer versions.
+    - $HOME/.cache/composer/files
 
 install:
  # Setup the test server