diff --git a/.travis.yml b/.travis.yml
index 9755b30..a17a008 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,10 +6,6 @@ env:
   global:
    - RACKET_DIR=~/racket
   matrix:
-   - RACKET_VERSION=6.3
-   - RACKET_VERSION=6.4
-   - RACKET_VERSION=6.5
-   - RACKET_VERSION=6.6
    - RACKET_VERSION=6.7
    - RACKET_VERSION=HEAD