diff --git a/Database/Persist/Postgresql.hs b/Database/Persist/Postgresql.hs
--- a/Database/Persist/Postgresql.hs
+++ b/Database/Persist/Postgresql.hs
@@ -60,6 +60,7 @@
 
 import Data.Text (Text)
 import Data.Aeson
+import Data.Aeson.Types (modifyFailure)
 import Control.Monad (forM, mzero)
 import Data.Acquire (Acquire, mkAcquire, with)
 import System.Environment (getEnvironment)
@@ -870,7 +871,8 @@
     } deriving Show
 
 instance FromJSON PostgresConf where
-    parseJSON = withObject "PostgresConf" $ \o -> do
+    parseJSON v = modifyFailure ("Persistent: error loadomg PostgreSQL conf: " ++) $
+      flip (withObject "PostgresConf") v $ \o -> do
         database <- o .: "database"
         host     <- o .: "host"
         port     <- o .:? "port" .!= 5432
diff --git a/persistent-postgresql.cabal b/persistent-postgresql.cabal
--- a/persistent-postgresql.cabal
+++ b/persistent-postgresql.cabal
@@ -1,5 +1,5 @@
 name:            persistent-postgresql
-version:         2.1.5
+version:         2.1.5.1
 license:         MIT
 license-file:    LICENSE
 author:          Felipe Lessa, Michael Snoyman <michael@snoyman.com>
@@ -26,7 +26,7 @@
                    , monad-control         >= 0.2
                    , blaze-builder
                    , time                  >= 1.1
-                   , aeson                 >= 0.5
+                   , aeson                 >= 0.6.2
                    , conduit               >= 0.5.3
                    , resourcet             >= 1.1
                    , monad-logger          >= 0.3.4