diff --git a/Database/Groundhog/Postgresql.hs b/Database/Groundhog/Postgresql.hs
--- a/Database/Groundhog/Postgresql.hs
+++ b/Database/Groundhog/Postgresql.hs
@@ -163,6 +163,15 @@
     liftIO $ PG.commit c
     return x
 
+instance TryConnectionManager Postgresql where
+  tryWithConn f g conn@(Postgresql c) = do
+    liftIO $ PG.begin c
+    x <- g (f conn)
+    case x of
+      Left _ -> liftIO $ PG.rollback c
+      Right _ -> liftIO $ PG.commit c
+    return x
+
 instance ExtractConnection Postgresql Postgresql where
   extractConn f conn = f conn
 
diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,3 +1,6 @@
+0.8.0.2
+* Remove upper bound for aeson
+
 0.8.0.1
 * Bump aeson to 1.2
 
diff --git a/groundhog-postgresql.cabal b/groundhog-postgresql.cabal
--- a/groundhog-postgresql.cabal
+++ b/groundhog-postgresql.cabal
@@ -1,5 +1,5 @@
 name:            groundhog-postgresql
-version:         0.8.0.1
+version:         0.8.0.2
 license:         BSD3
 license-file:    LICENSE
 author:          Boris Lykah <lykahb@gmail.com>
@@ -16,7 +16,7 @@
 
 library
     build-depends:   base                     >= 4         && < 5
-                   , aeson                    >= 0.8       && < 1.3
+                   , aeson                    >= 0.8
                    , postgresql-simple        >= 0.3       && < 0.6
                    , postgresql-libpq         >= 0.6.1
                    , bytestring               >= 0.9