diff --git a/library/Ratel/Wai.hs b/library/Ratel/Wai.hs
index c5a4af7..895dbba 100644
--- a/library/Ratel/Wai.hs
+++ b/library/Ratel/Wai.hs
@@ -17,8 +17,8 @@ ratelMiddleware apiKey maybeManager handle request respond = do
         (do
             handle request (\ response -> do
                 respond response))
-        (\ exception -> do
-            let err = Ratel.toError (exception :: Exception.SomeException)
+        (\ (Exception.SomeException exception) -> do
+            let err = Ratel.toError exception
             let req = Ratel.Request
                     { Ratel.requestAction = Nothing
                     , Ratel.requestCgiData = Just (Map.union
diff --git a/package.yaml b/package.yaml
index d64e4bf..c4eea34 100644
--- a/package.yaml
+++ b/package.yaml
@@ -14,11 +14,11 @@ library:
   - case-insensitive ==1.2.*
   - containers ==0.5.*
   - http-client >=0.4.30 && <0.6
-  - ratel ==0.3.*
+  - ratel ==0.4.*
   - wai ==3.2.*
   source-dirs: library
 license: MIT
 maintainer: Taylor Fausak
 name: ratel-wai
 synopsis: Notify Honeybadger about exceptions via a WAI middleware.
-version: '0.2.0'
+version: '0.3.0'
diff --git a/stack.yaml b/stack.yaml
index 06ba912..1ab9fef 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,3 +1,9 @@
+packages:
+- location:
+    git: https://github.com/positiondev/ratel
+    commit: 901fa37decad1df832ae1411cc701d249b98edaf
+  extra-dep: true
 extra-deps:
-- ratel-0.3.0
+- ratel-0.4.0
 resolver: nightly-2016-07-15
+