diff --git a/Yesod/Content.hs b/Yesod/Content.hs
--- a/Yesod/Content.hs
+++ b/Yesod/Content.hs
@@ -2,6 +2,7 @@
 {-# LANGUAGE TypeSynonymInstances #-}
 {-# LANGUAGE Rank2Types #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE CPP #-}
 module Yesod.Content
     ( -- * Content
       Content (..)
@@ -59,7 +60,11 @@
 import Data.Monoid (mempty)
 
 import Text.Hamlet (Html)
+#if MIN_VERSION_blaze_html(0, 5, 0)
+import Text.Blaze.Html.Renderer.Utf8 (renderHtmlBuilder)
+#else
 import Text.Blaze.Renderer.Utf8 (renderHtmlBuilder)
+#endif
 import Data.String (IsString (fromString))
 import Network.Wai (FilePart)
 import Data.Conduit (Source, ResourceT, Flush)
diff --git a/Yesod/Handler.hs b/Yesod/Handler.hs
--- a/Yesod/Handler.hs
+++ b/Yesod/Handler.hs
@@ -138,7 +138,11 @@
 import qualified Network.HTTP.Types as H
 
 import Text.Hamlet
-import qualified Text.Blaze.Renderer.Text
+#if MIN_VERSION_blaze_html(0, 5, 0)
+import qualified Text.Blaze.Html.Renderer.Text as RenderText
+#else
+import qualified Text.Blaze.Renderer.Text as RenderText
+#endif
 import qualified Data.Text as T
 import Data.Text.Encoding (encodeUtf8, decodeUtf8With)
 import Data.Text.Encoding.Error (lenientDecode)
@@ -161,7 +165,12 @@
 import Data.Text (Text)
 import Yesod.Message (RenderMessage (..))
 
+#if MIN_VERSION_blaze_html(0, 5, 0)
+import Text.Blaze.Html (toHtml, preEscapedToMarkup)
+#define preEscapedText preEscapedToMarkup
+#else
 import Text.Blaze (toHtml, preEscapedText)
+#endif
 
 import qualified Yesod.Internal.Cache as Cache
 import Yesod.Internal.Cache (mkCacheKey, CacheKey)
@@ -528,7 +537,7 @@
 --
 -- See 'getMessage'.
 setMessage :: Html -> GHandler sub master ()
-setMessage = setSession msgKey . T.concat . TL.toChunks . Text.Blaze.Renderer.Text.renderHtml
+setMessage = setSession msgKey . T.concat . TL.toChunks . RenderText.renderHtml
 
 -- | Sets a message in the user's session.
 --
diff --git a/Yesod/Internal/Core.hs b/Yesod/Internal/Core.hs
--- a/Yesod/Internal/Core.hs
+++ b/Yesod/Internal/Core.hs
@@ -84,13 +84,22 @@
 import qualified Data.Text.Lazy.IO
 import qualified Data.Text.Lazy.Builder as TB
 import Language.Haskell.TH.Syntax (Loc (..), Lift (..))
+#if MIN_VERSION_blaze_html(0, 5, 0)
+import Text.Blaze (preEscapedToMarkup)
+#else
 import Text.Blaze (preEscapedLazyText)
+#endif
 import Data.Aeson (Value (Array, String))
 import Data.Aeson.Encode (encode)
 import qualified Data.Vector as Vector
 import Network.Wai.Middleware.Gzip (GzipSettings, def)
 import qualified Paths_yesod_core
 import Data.Version (showVersion)
+
+#if MIN_VERSION_blaze_html(0, 5, 0)
+preEscapedLazyText :: TL.Text -> Html
+preEscapedLazyText = preEscapedToMarkup
+#endif
 
 yesodVersion :: String
 yesodVersion = showVersion Paths_yesod_core.version
diff --git a/Yesod/Widget.hs b/Yesod/Widget.hs
--- a/Yesod/Widget.hs
+++ b/Yesod/Widget.hs
@@ -80,10 +80,20 @@
 import Control.Exception (throwIO)
 import qualified Text.Hamlet as NP
 import Data.Text.Lazy.Builder (fromLazyText)
+#if MIN_VERSION_blaze_html(0, 5, 0)
+import Text.Blaze.Html (toHtml, preEscapedToMarkup)
+import qualified Data.Text.Lazy as TL
+#else
 import Text.Blaze (toHtml, preEscapedLazyText)
+#endif
 import Control.Monad.Base (MonadBase (liftBase))
 import Control.Arrow (first)
 import Control.Monad.Trans.Resource
+
+#if MIN_VERSION_blaze_html(0, 5, 0)
+preEscapedLazyText :: TL.Text -> Html
+preEscapedLazyText = preEscapedToMarkup
+#endif
 
 -- | A generic widget, allowing specification of both the subsite and master
 -- site datatypes. While this is simply a @WriterT@, we define a newtype for
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:         1.0.1
+version:         1.0.1.1
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -40,6 +40,10 @@
   description: Build the executable to run unit tests
   default: False
 
+flag blaze_html_0_5
+    description: use blaze-html 0.5 and blaze-markup 0.5
+    default: False
+
 flag ghc7
 
 library
@@ -78,7 +82,6 @@
                    , monad-control         >= 0.3      && < 0.4
                    , transformers-base     >= 0.4
                    , cookie                >= 0.4      && < 0.5
-                   , blaze-html            >= 0.4.1.3  && < 0.5
                    , http-types            >= 0.6.5    && < 0.7
                    , case-insensitive      >= 0.2
                    , parsec                >= 2        && < 3.2
@@ -90,6 +93,15 @@
                    , conduit               >= 0.4      && < 0.5
                    , resourcet             >= 0.3      && < 0.4
                    , lifted-base           >= 0.1      && < 0.2
+
+    if flag(blaze_html_0_5)
+        build-depends:
+                     blaze-html               >= 0.5     && < 0.6
+                   , blaze-markup             >= 0.5.1   && < 0.6
+    else
+        build-depends:
+                     blaze-html               >= 0.4     && < 0.5
+
     exposed-modules: Yesod.Content
                      Yesod.Core
                      Yesod.Dispatch