diff --git a/.travis.yml b/.travis.yml
index 71cd24bf..69083f28 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,7 +20,7 @@ env:
   # - "RAILS_VERSION=3.0"
   # - "RAILS_VERSION=3.1"
   # - "RAILS_VERSION=3.2"
-  # - "RAILS_VERSION=4.0"
+  - "RAILS_VERSION=4.0"
   - "RAILS_VERSION=4.1"
   - "RAILS_VERSION=4.2"
   # - "RAILS_VERSION=master"