diff --git a/.travis.yml b/.travis.yml
index f9586d0..af32b53 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,6 +21,15 @@ env:
     # create a Travis-CI build matrix to test against multiple Racket
     # versions.
     - RACKET_VERSION=6.7
+    - RACKET_VERSION=6.8
+    - RACKET_VERSION=6.9
+    - RACKET_VERSION=6.10
+    - RACKET_VERSION=6.10.1
+    - RACKET_VERSION=6.11
+    - RACKET_VERSION=6.12
+    - RACKET_VERSION=7.0
+    - RACKET_VERSION=7.1
+    - RACKET_VERSION=7.2
     - RACKET_VERSION=HEAD
 
 matrix: