diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # postgresql-simple-queue
 
-This module utilize PostgreSQL to implement a durable queue for efficently processing arbitrary payloads which can be represented as JSON.
+This module utilizes PostgreSQL to implement a durable queue for efficently processing arbitrary payloads which can be represented as JSON.
 
 Typically a producer would enqueue a new payload as part of larger database transaction
 
diff --git a/postgresql-simple-queue.cabal b/postgresql-simple-queue.cabal
--- a/postgresql-simple-queue.cabal
+++ b/postgresql-simple-queue.cabal
@@ -1,5 +1,5 @@
 name:                postgresql-simple-queue
-version:             0.5.0.1
+version:             0.5.1.0
 synopsis: A PostgreSQL backed queue
 description:
  This module utilize PostgreSQL to implement a durable queue for efficently processing arbitrary payloads which can be represented as JSON.
diff --git a/src/Database/PostgreSQL/Simple/Queue.hs b/src/Database/PostgreSQL/Simple/Queue.hs
--- a/src/Database/PostgreSQL/Simple/Queue.hs
+++ b/src/Database/PostgreSQL/Simple/Queue.hs
@@ -264,12 +264,12 @@
     shutdown. For a DB API version see 'unlockDB'
 -}
 unlock :: String -> Connection -> PayloadId -> IO ()
-unlock schemaName conn x = runDBTSerializable (unlockDB schemaName x) conn
+unlock schemaName conn x = runDBT  (unlockDB schemaName x) ReadCommitted conn
 
 -- | Transition a 'Payload' to the 'Dequeued' state. his functions runs
 --   'dequeueDB' as a 'Serializable' transaction.
 dequeue :: String -> Connection -> PayloadId -> IO ()
-dequeue schemaName conn x = runDBTSerializable (dequeueDB schemaName x) conn
+dequeue schemaName conn x = runDBT (dequeueDB schemaName x) ReadCommitted conn
 
 {-| Get the number of rows in the 'Enqueued' state. This function runs
     'getCountDB' in a 'ReadCommitted' transaction.