diff --git a/Yesod/Form/Profiles.hs b/Yesod/Form/Profiles.hs
index 1dd78255..e224e50b 100644
--- a/Yesod/Form/Profiles.hs
+++ b/Yesod/Form/Profiles.hs
@@ -33,7 +33,8 @@ import Text.HTML.SanitizeXSS (sanitizeBalance)
 import Control.Monad (when)
 
 import qualified Blaze.ByteString.Builder.Html.Utf8 as B
-import Blaze.ByteString.Builder (fromWrite4List, writeByteString)
+import Blaze.ByteString.Builder (writeByteString)
+import Blaze.ByteString.Builder.Internal.Write (fromWriteList)
 
 import Yesod.Internal (lbsToChars)
 
@@ -108,7 +109,7 @@ newtype Textarea = Textarea { unTextarea :: String }
     deriving (Show, Read, Eq, PersistField)
 instance ToHtml Textarea where
     toHtml =
-        Html . fromWrite4List writeHtmlEscapedChar . unTextarea
+        Html . fromWriteList writeHtmlEscapedChar . unTextarea
       where
         -- Taken from blaze-builder and modified with newline handling.
         writeHtmlEscapedChar '\n' = writeByteString "<br>"
diff --git a/Yesod/Json.hs b/Yesod/Json.hs
index 797ad44e..3e96aca3 100644
--- a/Yesod/Json.hs
+++ b/Yesod/Json.hs
@@ -25,6 +25,7 @@ import Numeric (showHex)
 import Data.Monoid (Monoid (..))
 import Blaze.ByteString.Builder
 import Blaze.ByteString.Builder.Char.Utf8 (writeChar)
+import Blaze.ByteString.Builder.Internal.Write (fromWriteList)
 
 #if TEST
 import Test.Framework (testGroup, Test)
@@ -63,7 +64,7 @@ jsonToRepJson = fmap RepJson . jsonToContent
 jsonScalar :: String -> Json
 jsonScalar s = Json $ mconcat
     [ fromByteString "\""
-    , fromWrite4List writeJsonChar s
+    , fromWriteList writeJsonChar s
     , fromByteString "\""
     ]
   where
diff --git a/yesod.cabal b/yesod.cabal
index 0293a2e7..adb34e63 100644
--- a/yesod.cabal
+++ b/yesod.cabal
@@ -1,5 +1,5 @@
 name:            yesod
-version:         0.6.6
+version:         0.6.7
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -37,7 +37,7 @@ library
                    , template-haskell          >= 2.4      && < 2.6
                    , web-routes-quasi          >= 0.6.2    && < 0.7
                    , hamlet                    >= 0.5.1    && < 0.7
-                   , blaze-builder             >= 0.2      && < 0.3
+                   , blaze-builder             >= 0.2.1    && < 0.3
                    , transformers              >= 0.2      && < 0.3
                    , clientsession             >= 0.4.0    && < 0.5
                    , pureMD5                   >= 1.1.0.0  && < 2.2