diff --git a/Yesod/Json.hs b/Yesod/Json.hs
index f4752c50..83c03538 100644
--- a/Yesod/Json.hs
+++ b/Yesod/Json.hs
@@ -52,3 +52,8 @@ jsonList = J.Array . V.fromList
 
 jsonMap :: [(String, Json)] -> Json
 jsonMap = J.Object . fromList . map (first pack)
+
+{- FIXME
+instance ToJavascript J.Value where
+    toJavascript = fromLazyText . decodeUtf8 . toLazyByteString . JE.renderValue
+-}
diff --git a/yesod-json.cabal b/yesod-json.cabal
index 4056493a..4fa1af67 100644
--- a/yesod-json.cabal
+++ b/yesod-json.cabal
@@ -13,7 +13,7 @@ homepage:        http://docs.yesodweb.com/
 
 library
     build-depends:   base                      >= 4        && < 5
-                   , yesod-core                >= 0.7      && < 0.8
+                   , yesod-core                >= 0.8      && < 0.9
                    , aeson                     >= 0.3.1.1  && < 0.4
                    , text                      >= 0.8      && < 0.12
                    , vector