diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+#### 0.3.1.1
+
+* Allow rest-core-0.39.
+
 ### 0.3.1
 
 * Generalize type of `apiToHandler` to allow transformer stacks on top
diff --git a/rest-happstack.cabal b/rest-happstack.cabal
--- a/rest-happstack.cabal
+++ b/rest-happstack.cabal
@@ -1,5 +1,5 @@
 name:                rest-happstack
-version:             0.3.1
+version:             0.3.1.1
 description:         Rest driver for Happstack.
 synopsis:            Rest driver for Happstack.
 maintainer:          code@silk.co
@@ -28,6 +28,6 @@
     , containers >= 0.4 && < 0.6
     , happstack-server >= 7.0.5 && < 7.5
     , mtl >= 2.0 && < 2.3
-    , rest-core >= 0.34 && < 0.38
+    , rest-core >= 0.34 && < 0.40
     , rest-gen >= 0.14 && < 0.20
     , utf8-string >= 0.3 && < 1.1