diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 3.0.4.2
+
+Allow blaze-builder 0.4
+
 ## 3.0.4.1
 
 Fix compilation failure on Windows [#321](https://github.com/yesodweb/wai/issues/321)
diff --git a/wai-extra.cabal b/wai-extra.cabal
--- a/wai-extra.cabal
+++ b/wai-extra.cabal
@@ -1,5 +1,5 @@
 Name:                wai-extra
-Version:             3.0.4.1
+Version:             3.0.4.2
 Synopsis:            Provides some basic WAI handlers and middleware.
 description:         API docs and the README are available at <http://www.stackage.org/package/wai-extra>.
 License:             MIT
@@ -28,7 +28,7 @@
                    , network                   >= 2.2.1.5
                    , directory                 >= 1.0.1
                    , transformers              >= 0.2.2
-                   , blaze-builder             >= 0.2.1.4  && < 0.4
+                   , blaze-builder             >= 0.2.1.4  && < 0.5
                    , http-types                >= 0.7
                    , text                      >= 0.7
                    , case-insensitive          >= 0.2