diff --git a/Database/MongoDB/Admin.hs b/Database/MongoDB/Admin.hs
index 88933cf..cc16013 100644
--- a/Database/MongoDB/Admin.hs
+++ b/Database/MongoDB/Admin.hs
@@ -31,9 +31,10 @@ import Database.MongoDB.Internal.Protocol (pwHash, pwKey)
 import Database.MongoDB.Connection (Host, showHostPort)
 import Database.MongoDB.Query
 import Data.Bson
-import Data.UString (pack, append, intercalate)
 import Control.Monad.Reader
-import qualified Data.HashTable as T
+import Data.Text (Text)
+import qualified Data.Text as T
+import qualified Data.HashTable as H
 import Data.IORef
 import qualified Data.Set as S
 import System.IO.Unsafe (unsafePerformIO)
@@ -68,7 +69,7 @@ dropCollection coll = do
 	resetIndexCache
 	r <- runCommand ["drop" =: coll]
 	if true1 "ok" r then return True else do
-		if at "errmsg" r == ("ns not found" :: UString) then return False else
+		if at "errmsg" r == ("ns not found" :: Text) then return False else
 			fail $ "dropCollection failed: " ++ show r
 
 validateCollection :: (MonadIO' m) => Collection -> Action m Document
@@ -77,7 +78,7 @@ validateCollection coll = runCommand ["validate" =: coll]
 
 -- ** Index
 
-type IndexName = UString
+type IndexName = Text
 
 data Index = Index {
 	iColl :: Collection,
@@ -100,8 +101,8 @@ index :: Collection -> Order -> Index
 index coll keys = Index coll keys (genName keys) False False
 
 genName :: Order -> IndexName
-genName keys = intercalate "_" (map f keys)  where
-	f (k := v) = k `append` "_" `append` pack (show v)
+genName keys = T.intercalate "_" (map f keys)  where
+	f (k := v) = k `T.append` "_" `T.append` T.pack (show v)
 
 ensureIndex :: (MonadIO' m) => Index -> Action m ()
 -- ^ Create index if we did not already create one. May be called repeatedly with practically no performance hit, because we remember if we already called this for the same index (although this memory gets wiped out every 15 minutes, in case another client drops the index and we want to create it again).
@@ -132,11 +133,11 @@ dropIndexes :: (MonadIO' m) => Collection -> Action m Document
 -- ^ Drop all indexes on this collection
 dropIndexes coll = do
 	resetIndexCache
-	runCommand ["deleteIndexes" =: coll, "index" =: ("*" :: UString)]
+	runCommand ["deleteIndexes" =: coll, "index" =: ("*" :: Text)]
 
 -- *** Index cache
 
-type DbIndexCache = T.HashTable Database IndexCache
+type DbIndexCache = H.HashTable Database IndexCache
 -- ^ Cache the indexes we create so repeatedly calling ensureIndex only hits database the first time. Clear cache every once in a while so if someone else deletes index we will recreate it on ensureIndex.
 
 type IndexCache = IORef (S.Set (Collection, IndexName))
@@ -144,27 +145,27 @@ type IndexCache = IORef (S.Set (Collection, IndexName))
 dbIndexCache :: DbIndexCache
 -- ^ initialize cache and fork thread that clears it every 15 minutes
 dbIndexCache = unsafePerformIO $ do
-	table <- T.new (==) (T.hashString . unpack)
+	table <- H.new (==) (H.hashString . T.unpack)
 	_ <- forkIO . forever $ threadDelay 900000000 >> clearDbIndexCache
 	return table
 {-# NOINLINE dbIndexCache #-}
 
 clearDbIndexCache :: IO ()
 clearDbIndexCache = do
-	keys <- map fst <$> T.toList dbIndexCache
-	mapM_ (T.delete dbIndexCache) keys
+	keys <- map fst <$> H.toList dbIndexCache
+	mapM_ (H.delete dbIndexCache) keys
 
 fetchIndexCache :: (MonadIO m) => Action m IndexCache
 -- ^ Get index cache for current database
 fetchIndexCache = do
 	db <- thisDatabase
 	liftIO $ do
-		mc <- T.lookup dbIndexCache db
+		mc <- H.lookup dbIndexCache db
 		maybe (newIdxCache db) return mc
  where
 	newIdxCache db = do
 		idx <- newIORef S.empty
-		T.insert dbIndexCache db idx
+		H.insert dbIndexCache db idx
 		return idx
 
 resetIndexCache :: (MonadIO m) => Action m ()
@@ -223,7 +224,7 @@ repairDatabase db = useDb db $ runCommand ["repairDatabase" =: (1 :: Int)]
 serverBuildInfo :: (MonadIO' m) => Action m Document
 serverBuildInfo = useDb admin $ runCommand ["buildinfo" =: (1 :: Int)]
 
-serverVersion :: (MonadIO' m) => Action m UString
+serverVersion :: (MonadIO' m) => Action m Text
 serverVersion = at "version" <$> serverBuildInfo
 
 -- * Diagnostics
@@ -248,7 +249,7 @@ totalSize coll = do
 	xs <- mapM isize =<< getIndexes coll
 	return (foldl (+) x xs)
  where
-	isize idx = at "storageSize" <$> collectionStats (coll `append` ".$" `append` at "name" idx)
+	isize idx = at "storageSize" <$> collectionStats (coll `T.append` ".$" `T.append` at "name" idx)
 
 -- ** Profiling
 
diff --git a/Database/MongoDB/Connection.hs b/Database/MongoDB/Connection.hs
index bd7f330..bb761a8 100644
--- a/Database/MongoDB/Connection.hs
+++ b/Database/MongoDB/Connection.hs
@@ -26,7 +26,8 @@ import Control.Monad.Error (ErrorT(..), lift, throwError)
 import Control.Concurrent.MVar.Lifted
 import Control.Monad (forM_)
 import Control.Applicative ((<$>))
-import Data.UString (UString, unpack)
+import Data.Text (Text)
+import qualified Data.Text as T
 import Data.Bson as D (Document, lookup, at, (=:))
 import Database.MongoDB.Query (access, slaveOk, Failure(ConnectionFailure), Command, runCommand)
 import Database.MongoDB.Internal.Util (untilSuccess, liftIOE, runIOE, updateAssocs, shuffle, mergesortM)
@@ -105,12 +106,12 @@ connect' timeoutSecs (Host hostname port) = do
 
 -- * Replica Set
 
-type ReplicaSetName = UString
+type ReplicaSetName = Text
 
 -- | Maintains a connection (created on demand) to each server in the named replica set
 data ReplicaSet = ReplicaSet ReplicaSetName (MVar [(Host, Maybe Pipe)]) Secs
 
-replSetName :: ReplicaSet -> UString
+replSetName :: ReplicaSet -> Text
 -- ^ name of connected replica set
 replSetName (ReplicaSet rsName _ _) = rsName
 
@@ -136,7 +137,7 @@ primary rs@(ReplicaSet rsName _ _) = do
 	mHost <- statedPrimary <$> updateMembers rs
 	case mHost of
 		Just host' -> connection rs Nothing host'
-		Nothing -> throwError $ userError $ "replica set " ++ unpack rsName ++ " has no primary"
+		Nothing -> throwError $ userError $ "replica set " ++ T.unpack rsName ++ " has no primary"
 
 secondaryOk :: ReplicaSet -> IOE Pipe
 -- ^ Return connection to a random secondary, or primary if no secondaries available.
@@ -186,8 +187,8 @@ fetchReplicaInfo rs@(ReplicaSet rsName _ _) (host', mPipe) = do
 	pipe <- connection rs mPipe host'
 	info <- adminCommand ["isMaster" =: (1 :: Int)] pipe
 	case D.lookup "setName" info of
-		Nothing -> throwError $ userError $ show host' ++ " not a member of any replica set, including " ++ unpack rsName ++ ": " ++ show info
-		Just setName | setName /= rsName -> throwError $ userError $ show host' ++ " not a member of replica set " ++ unpack rsName ++ ": " ++ show info
+		Nothing -> throwError $ userError $ show host' ++ " not a member of any replica set, including " ++ T.unpack rsName ++ ": " ++ show info
+		Just setName | setName /= rsName -> throwError $ userError $ show host' ++ " not a member of replica set " ++ T.unpack rsName ++ ": " ++ show info
 		Just _ -> return (host', info)
 
 connection :: ReplicaSet -> Maybe Pipe -> Host -> IOE Pipe
diff --git a/Database/MongoDB/Internal/Protocol.hs b/Database/MongoDB/Internal/Protocol.hs
index 6872f81..67c493c 100644
--- a/Database/MongoDB/Internal/Protocol.hs
+++ b/Database/MongoDB/Internal/Protocol.hs
@@ -25,7 +25,7 @@ import Data.ByteString.Lazy as B (length, hPut)
 import System.IO.Pipeline (IOE, Pipeline, newPipeline, IOStream(..))
 import qualified System.IO.Pipeline as P (send, call)
 import System.IO (Handle, hClose)
-import Data.Bson (Document, UString)
+import Data.Bson (Document)
 import Data.Bson.Binary
 import Data.Binary.Put
 import Data.Binary.Get
@@ -33,8 +33,10 @@ import Data.Int
 import Data.Bits
 import Data.IORef
 import System.IO.Unsafe (unsafePerformIO)
+import Data.Text (Text)
 import qualified Crypto.Hash.MD5 as MD5 (hash)
-import Data.UString as U (pack, append, toByteString)
+import qualified Data.Text as T
+import qualified Data.Text.Encoding as TE
 import Control.Exception as E (try)
 import Control.Monad.Error
 import System.IO (hFlush)
@@ -95,7 +97,7 @@ readMessage handle = ErrorT $ E.try readResp  where
 		runGet getReply <$> hGetN handle len
 	decodeSize = subtract 4 . runGet getInt32
 
-type FullCollection = UString
+type FullCollection = Text
 -- ^ Database name and collection name with period (.) in between. Eg. \"myDb.myCollection\"
 
 -- ** Header
@@ -319,15 +321,15 @@ rBit AwaitCapable = 3
 
 -- * Authentication
 
-type Username = UString
-type Password = UString
-type Nonce = UString
+type Username = Text
+type Password = Text
+type Nonce = Text
 
-pwHash :: Username -> Password -> UString
-pwHash u p = pack . byteStringHex . MD5.hash . toByteString $ u `U.append` ":mongo:" `U.append` p
+pwHash :: Username -> Password -> Text
+pwHash u p = T.pack . byteStringHex . MD5.hash . TE.encodeUtf8 $ u `T.append` ":mongo:" `T.append` p
 
-pwKey :: Nonce -> Username -> Password -> UString
-pwKey n u p = pack . byteStringHex . MD5.hash . toByteString . U.append n . U.append u $ pwHash u p
+pwKey :: Nonce -> Username -> Password -> Text
+pwKey n u p = T.pack . byteStringHex . MD5.hash . TE.encodeUtf8 . T.append n . T.append u $ pwHash u p
 
 
 {- Authors: Tony Hannan <tony@10gen.com>
diff --git a/Database/MongoDB/Internal/Util.hs b/Database/MongoDB/Internal/Util.hs
index 6524e11..c8e6eea 100644
--- a/Database/MongoDB/Internal/Util.hs
+++ b/Database/MongoDB/Internal/Util.hs
@@ -8,7 +8,6 @@ module Database.MongoDB.Internal.Util where
 
 import Control.Applicative (Applicative(..), (<$>))
 import Network (PortID(..))
-import Data.UString as U (cons, append)
 import Data.Bits (Bits, (.|.))
 import Data.Bson
 import Data.ByteString.Lazy as S (ByteString, length, append, hGet)
@@ -17,7 +16,9 @@ import System.IO.Error (mkIOError, eofErrorType)
 import Control.Exception (assert)
 import Control.Monad.Error
 import Control.Arrow (left)
+import Data.Text (Text)
 import qualified Data.ByteString as BS (ByteString, unpack)
+import qualified Data.Text as T
 import Data.Word (Word8)
 import Numeric (showHex)
 import System.Random.Shuffle (shuffle')
@@ -96,9 +97,9 @@ bitOr :: (Bits a) => [a] -> a
 -- ^ bit-or all numbers together
 bitOr = foldl (.|.) 0
 
-(<.>) :: UString -> UString -> UString
+(<.>) :: Text -> Text -> Text
 -- ^ Concat first and second together with period in between. Eg. @\"hello\" \<.\> \"world\" = \"hello.world\"@
-a <.> b = U.append a (cons '.' b)
+a <.> b = T.append a (T.cons '.' b)
 
 true1 :: Label -> Document -> Bool
 -- ^ Is field's value a 1 or True (MongoDB use both Int and Bools for truth values). Error if field not in document or field not a Num or Bool.
diff --git a/Database/MongoDB/Query.hs b/Database/MongoDB/Query.hs
index 00043cc..3a933a8 100644
--- a/Database/MongoDB/Query.hs
+++ b/Database/MongoDB/Query.hs
@@ -39,7 +39,8 @@ module Database.MongoDB.Query (
 ) where
 
 import Prelude as X hiding (lookup)
-import Data.UString as U (UString, dropWhile, any, tail)
+import Data.Text (Text)
+import qualified Data.Text as T
 import Data.Bson (Document, at, valueAt, lookup, look, Field(..), (=:), (=?), Label, Value(String,Doc), Javascript, genObjectId)
 import Database.MongoDB.Internal.Protocol (Pipe, Notice(..), Request(GetMore, qOptions, qFullCollection, qSkip, qBatchSize, qSelector, qProjector), Reply(..), QueryOption(..), ResponseFlag(..), InsertOption(..), UpdateOption(..), DeleteOption(..), CursorId, FullCollection, Username, Password, pwKey)
 import qualified Database.MongoDB.Internal.Protocol as P (send, call, Request(Query))
@@ -184,7 +185,7 @@ instance (MonadDB m, Monoid w) => MonadDB (RWST r w s m) where
 
 -- * Database
 
-type Database = UString
+type Database = Text
 
 allDatabases :: (MonadIO' m) => Action m [Database]
 -- ^ List all databases residing on server
@@ -208,7 +209,7 @@ auth usr pss = do
 
 -- * Collection
 
-type Collection = UString
+type Collection = Text
 -- ^ Collection name (not prefixed with database)
 
 allCollections :: (MonadIO m, MonadBaseControl IO m, Functor m) => Action m [Collection]
@@ -218,8 +219,8 @@ allCollections = do
 	docs <- rest =<< find (query [] "system.namespaces") {sort = ["name" =: (1 :: Int)]}
 	return . filter (not . isSpecial db) . map dropDbPrefix $ map (at "name") docs
  where
- 	dropDbPrefix = U.tail . U.dropWhile (/= '.')
- 	isSpecial db col = U.any (== '$') col && db <.> col /= "local.oplog.$main"
+ 	dropDbPrefix = T.tail . T.dropWhile (/= '.')
+ 	isSpecial db col = T.any (== '$') col && db <.> col /= "local.oplog.$main"
 
 -- * Selection
 
@@ -670,7 +671,7 @@ runCommand :: (MonadIO' m) => Command -> Action m Document
 runCommand c = maybe err id <$> findOne (query c "$cmd") where
 	err = error $ "Nothing returned for command: " ++ show c
 
-runCommand1 :: (MonadIO' m) => UString -> Action m Document
+runCommand1 :: (MonadIO' m) => Text -> Action m Document
 -- ^ @runCommand1 foo = runCommand [foo =: 1]@
 runCommand1 c = runCommand [c =: (1 :: Int)]
 
diff --git a/mongoDB.cabal b/mongoDB.cabal
index eefc7d2..ae23b37 100644
--- a/mongoDB.cabal
+++ b/mongoDB.cabal
@@ -10,7 +10,8 @@ build-depends:
     array -any,
     base <5,
     binary -any,
-    bson -any,
+    bson-text -any,
+    text,
     bytestring -any,
     containers -any,
     mtl >= 2,