diff --git a/wai-eventsource.cabal b/wai-eventsource.cabal
--- a/wai-eventsource.cabal
+++ b/wai-eventsource.cabal
@@ -1,5 +1,5 @@
 Name:                wai-eventsource
-Version:             1.3.0.3
+Version:             1.3.0.4
 Synopsis:            WAI support for server-sent events
 Description:         WAI support for server-sent events
 License:             MIT
@@ -19,7 +19,7 @@
     , blaze-builder             >= 0.3 && < 0.4
     , conduit                   >= 0.5      && < 1.1
     , http-types                >= 0.7
-    , wai                       >= 1.3      && < 1.4
+    , wai                       >= 1.3      && < 1.5
     , warp                      >= 1.3      && < 1.4
     , transformers