diff --git a/.travis.yml b/.travis.yml
index 548c58b..1d19306 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,10 @@ env:
   global:
     - RACKET_DIR=~/racket
   matrix:
+    - RACKET_VERSION=6.0
+    - RACKET_VERSION=6.1
     - RACKET_VERSION=6.1.1
+    - RACKET_VERSION=HEAD
 
 matrix:
   fast_finish: true