diff --git a/.travis.yml b/.travis.yml
index 24f1931..5815fe4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,9 @@ env:
   matrix:
     - RACKET_VERSION=6.1.1
     - RACKET_VERSION=6.2
+    - RACKET_VERSION=6.2.1
+    - RACKET_VERSION=6.3
+    - RACKET_VERSION=6.4
     - RACKET_VERSION=HEAD
 
 matrix: