diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 ## Changelog
 
-#### 0.6.0.2 (2013-01-06)
+#### 0.6.0.3 (2015-01-05)
+
+* Bug fix: Serialize ajax post bodies using JSON.stringify.
+
+#### 0.6.0.2 (2014-01-06)
 
 * Bug fix: Force thunks on polymorphic arguments such as `a` in `append :: Selectable a => a -> JQuery -> Fay JQuery`. Previously only constant values would be passed to jQuery correctly for these arguments.
 
diff --git a/fay-jquery.cabal b/fay-jquery.cabal
--- a/fay-jquery.cabal
+++ b/fay-jquery.cabal
@@ -1,5 +1,5 @@
 name:                fay-jquery
-version:             0.6.0.2
+version:             0.6.0.3
 synopsis:            jQuery bindings for Fay.
 description:         jQuery bindings for Fay.
 homepage:            https://github.com/faylang/fay-jquery
diff --git a/src/JQuery.hs b/src/JQuery.hs
--- a/src/JQuery.hs
+++ b/src/JQuery.hs
@@ -159,6 +159,7 @@
         \ delete o[p]; \
       \ } \
     \ } \
+    \ o['data'] = JSON.stringify(o['data']); \
     \ return jQuery.ajax(o); \
   \ })(%1)"
 
@@ -169,7 +170,6 @@
 addClass :: Text -> JQuery -> Fay JQuery
 addClass = ffi "%2['addClass'](%1)"
 
--- FIXME: https://github.com/chrisdone/fay/issues/38
 addClassWith :: (Double -> Text -> Fay Text) -> JQuery -> Fay JQuery
 addClassWith = ffi "%2['addClass'](%1)"