diff --git a/wai-handler-launch.cabal b/wai-handler-launch.cabal
--- a/wai-handler-launch.cabal
+++ b/wai-handler-launch.cabal
@@ -1,5 +1,5 @@
 Name:                wai-handler-launch
-Version:             3.0.0.3
+Version:             3.0.0.4
 Synopsis:            Launch a web app in the default browser.
 description:         API docs and the README are available at <http://www.stackage.org/package/wai-handler-launch>.
 License:             MIT
@@ -15,7 +15,7 @@
     Exposed-modules: Network.Wai.Handler.Launch
     build-depends:   base                    >= 4       && < 5
                    , wai                     >= 3.0     && < 3.1
-                   , warp                    >= 3.0     && < 3.1
+                   , warp                    >= 3.0     && < 3.2
                    , http-types              >= 0.7
                    , transformers            >= 0.2.2
                    , bytestring              >= 0.9.1.4