diff --git a/.travis.yml b/.travis.yml
index 105176c..436fbc5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,7 +29,7 @@ env:
     #- RACKET_VERSION=6.5
     - RACKET_VERSION=6.6
     - RACKET_VERSION=6.7
-    #- RACKET_VERSION=HEAD
+    - RACKET_VERSION=HEAD
 
 matrix:
   allow_failures: