diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 1.4.25
+
+* Add instance of MonadHandler and MonadWidget for ExceptT [#1278](https://github.com/yesodweb/yesod/pull/1278)
+
 ## 1.4.24
 
 * cached and cachedBy will not overwrite global state changes [#1268](https://github.com/yesodweb/yesod/pull/1268)
diff --git a/Yesod/Core/Class/Handler.hs b/Yesod/Core/Class/Handler.hs
--- a/Yesod/Core/Class/Handler.hs
+++ b/Yesod/Core/Class/Handler.hs
@@ -24,6 +24,9 @@
 import Control.Monad.Trans.List     ( ListT    )
 import Control.Monad.Trans.Maybe    ( MaybeT   )
 import Control.Monad.Trans.Error    ( ErrorT, Error)
+#if MIN_VERSION_transformers(0,4,0)
+import Control.Monad.Trans.Except   ( ExceptT  )
+#endif
 import Control.Monad.Trans.Reader   ( ReaderT  )
 import Control.Monad.Trans.State    ( StateT   )
 import Control.Monad.Trans.Writer   ( WriterT  )
@@ -55,6 +58,9 @@
 GO(ListT)
 GO(MaybeT)
 GOX(Error e, ErrorT e)
+#if MIN_VERSION_transformers(0,4,0)
+GO(ExceptT e)
+#endif
 GO(ReaderT r)
 GO(StateT s)
 GOX(Monoid w, WriterT w)
@@ -78,6 +84,9 @@
 GO(ListT)
 GO(MaybeT)
 GOX(Error e, ErrorT e)
+#if MIN_VERSION_transformers(0,4,0)
+GO(ExceptT e)
+#endif
 GO(ReaderT r)
 GO(StateT s)
 GOX(Monoid w, WriterT w)
diff --git a/yesod-core.cabal b/yesod-core.cabal
--- a/yesod-core.cabal
+++ b/yesod-core.cabal
@@ -1,5 +1,5 @@
 name:            yesod-core
-version:         1.4.24
+version:         1.4.25
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>