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:             2.0.1.2
+Version:             2.0.1.3
 Synopsis:            Launch a web app in the default browser.
 Description:         This handles cross-platform launching and inserts Javascript code to ping the server. When the server no longer receives pings, it shuts down.
 License:             MIT
@@ -16,7 +16,7 @@
                    , wai                     >= 2.0     && < 2.2
                    , warp                    >= 2.0     && < 2.2
                    , http-types              >= 0.7
-                   , transformers            >= 0.2.2   && < 0.4
+                   , transformers            >= 0.2.2
                    , bytestring              >= 0.9.1.4
                    , blaze-builder           >= 0.2.1.4 && < 0.4
                    , conduit                 >= 0.5     && < 1.2