diff --git a/.travis.yml b/.travis.yml
index 436fbc5..12b2795 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,8 +27,8 @@ env:
     #- RACKET_VERSION=6.3
     #- RACKET_VERSION=6.4
     #- RACKET_VERSION=6.5
-    - RACKET_VERSION=6.6
-    - RACKET_VERSION=6.7
+    #- RACKET_VERSION=6.6
+    #- RACKET_VERSION=6.7
     - RACKET_VERSION=HEAD
 
 matrix: