diff --git a/.travis.yml b/.travis.yml
index f9dcf98..c06b269 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,7 @@ env:
     - PATH="$RACKET_DIR/bin:$PATH"
   matrix:
     # RACKET_VERSION is an argument to install-racket.sh
-    - RACKET_VERSION=6.6
+    #- RACKET_VERSION=6.6 # tests fail with a typed/racket bug: "make-chaperone-contract::late-neg-projection: contract violation"
     - RACKET_VERSION=6.7
     - RACKET_VERSION=6.8
     - RACKET_VERSION=RELEASE
diff --git a/info.rkt b/info.rkt
index 53cdd1c..72844eb 100644
--- a/info.rkt
+++ b/info.rkt
@@ -1,6 +1,6 @@
 #lang info
 (define collection "typed-worklist")
-(define deps '("base"
+(define deps '(("base" "6.6.0.900")
                "rackunit-lib"
                "type-expander"
                "typed-racket-lib"