diff --git a/Network/Wai/Middleware/Static.hs b/Network/Wai/Middleware/Static.hs
--- a/Network/Wai/Middleware/Static.hs
+++ b/Network/Wai/Middleware/Static.hs
@@ -125,18 +125,18 @@
 staticPolicy :: Policy -> Middleware
 staticPolicy p = unsafeStaticPolicy $ noDots >-> isNotAbsolute >-> p
 
--- | Serve static files subject to a 'Policy'. Unlike 'static' and 'staticPolicy', this 
+-- | Serve static files subject to a 'Policy'. Unlike 'static' and 'staticPolicy', this
 -- has no policies enabled by default, and is hence insecure.
 unsafeStaticPolicy :: Policy -> Middleware
-unsafeStaticPolicy p app req =
-    maybe (app req)
+unsafeStaticPolicy p app req callback =
+    maybe (app req callback)
           (\fp -> do exists <- liftIO $ doesFileExist fp
                      if exists
-                        then return $ responseFile status200
-                                                   [("Content-Type", getMimeType fp)]
-                                                   fp
-                                                   Nothing
-                        else app req)
+                        then callback $ responseFile status200
+                                                     [("Content-Type", getMimeType fp)]
+                                                     fp
+                                                     Nothing
+                        else app req callback)
           (tryPolicy p $ T.unpack $ T.intercalate "/" $ pathInfo req)
 
 type Ascii = B.ByteString
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,9 +1,14 @@
+## 0.6.0
+
+* Update to wai 3.0
+
 ## 0.5.0.1
- * Bump upper bound for `mtl`
 
+* Bump upper bound for `mtl`
+
 ## 0.5.0.0
 
-* Add `isNotAbsolute` policy and change `static` and `staticPolicy` to 
+* Add `isNotAbsolute` policy and change `static` and `staticPolicy` to
   use `noDots` and `isNotAbsolute` policies by default. (Thanks to Nick Hibberd!)
 
 * Add `unsafeStaticPolicy`, which behaves as the old insecure `staticPolicy` behaved.
diff --git a/wai-middleware-static.cabal b/wai-middleware-static.cabal
--- a/wai-middleware-static.cabal
+++ b/wai-middleware-static.cabal
@@ -1,5 +1,5 @@
 Name:                wai-middleware-static
-Version:             0.5.0.1
+Version:             0.6.0
 Synopsis:            WAI middleware that serves requests to static files.
 Homepage:            https://github.com/scotty-web/scotty
 Bug-reports:         https://github.com/scotty-web/scotty/issues
@@ -31,7 +31,7 @@
                        http-types       >= 0.8.2    && < 0.9,
                        mtl              >= 2.1.2    && < 2.3,
                        text             >= 0.11.3.1 && < 1.2,
-                       wai              >= 2.0.0    && < 2.2
+                       wai              >= 3.0.0    && < 3.1
 
   GHC-options: -Wall -fno-warn-orphans