diff --git a/.travis.yml b/.travis.yml
index bddc44c..6244670 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ env:
   global:
     - RACKET_DIR=~/racket
   matrix:
-    - RACKET_VERSION=6.3
+    - RACKET_VERSION=6.4
     - RACKET_VERSION=HEAD
 
 before_install: