diff --git a/yesod-auth/Yesod/Auth.hs b/yesod-auth/Yesod/Auth.hs
index 535137b4..3a0cb4af 100644
--- a/yesod-auth/Yesod/Auth.hs
+++ b/yesod-auth/Yesod/Auth.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE ViewPatterns #-}
 {-# LANGUAGE ConstraintKinds #-}
 {-# LANGUAGE DefaultSignatures #-}
 {-# LANGUAGE QuasiQuotes, TypeFamilies, TemplateHaskell #-}
@@ -160,6 +161,18 @@ class (Yesod master, PathPiece (AuthId master), RenderMessage master FormMessage
     -- Since 1.2.0
     maybeAuthId :: HandlerT master IO (Maybe (AuthId master))
 
+#if MIN_VERSION_persistent(2, 0, 0)
+    default maybeAuthId
+        :: ( YesodAuth master
+           , PersistEntityBackend val ~ YesodPersistBackend master
+           , Key val ~ AuthId master
+           , PersistStore (PersistEntityBackend val)
+           , PersistEntity val
+           , YesodPersist master
+           , Typeable val
+           )
+        => HandlerT master IO (Maybe (AuthId master))
+#else
     default maybeAuthId
         :: ( YesodAuth master
            , PersistMonadBackend (b (HandlerT master IO)) ~ PersistEntityBackend val
@@ -171,6 +184,7 @@ class (Yesod master, PathPiece (AuthId master), RenderMessage master FormMessage
            , Typeable val
            )
         => HandlerT master IO (Maybe (AuthId master))
+#endif
     maybeAuthId = defaultMaybeAuthId
 
     -- | Called on login error for HTTP requests. By default, calls
@@ -192,6 +206,18 @@ credsKey = "_ID"
 -- 'maybeAuthIdRaw' for more information.
 --
 -- Since 1.1.2
+#if MIN_VERSION_persistent(2, 0, 0)
+defaultMaybeAuthId
+          :: ( YesodAuth master
+             , b ~ YesodPersistBackend master
+             , b ~ PersistEntityBackend val
+             , Key val ~ AuthId master
+             , PersistStore b
+             , PersistEntity val
+             , YesodPersist master
+             , Typeable val
+             ) => HandlerT master IO (Maybe (AuthId master))
+#else
 defaultMaybeAuthId
           :: ( YesodAuth master
              , PersistMonadBackend (b (HandlerT master IO)) ~ PersistEntityBackend val
@@ -202,6 +228,7 @@ defaultMaybeAuthId
              , YesodPersist master
              , Typeable val
              ) => HandlerT master IO (Maybe (AuthId master))
+#endif
 defaultMaybeAuthId = do
     ms <- lookupSession credsKey
     case ms of
@@ -211,6 +238,17 @@ defaultMaybeAuthId = do
                 Nothing -> return Nothing
                 Just aid -> fmap (fmap entityKey) $ cachedAuth aid
 
+#if MIN_VERSION_persistent(2, 0, 0)
+cachedAuth :: ( YesodAuth master
+             , b ~ YesodPersistBackend master
+             , b ~ PersistEntityBackend val
+             , Key val ~ AuthId master
+             , PersistStore b
+             , PersistEntity val
+             , YesodPersist master
+             , Typeable val
+             ) => AuthId master -> HandlerT master IO (Maybe (Entity val))
+#else
 cachedAuth :: ( YesodAuth master
              , PersistMonadBackend (b (HandlerT master IO)) ~ PersistEntityBackend val
              , b ~ YesodPersistBackend master
@@ -220,6 +258,7 @@ cachedAuth :: ( YesodAuth master
              , YesodPersist master
              , Typeable val
              ) => AuthId master -> HandlerT master IO (Maybe (Entity val))
+#endif
 cachedAuth aid = runMaybeT $ do
     a <- MaybeT $ fmap unCachedMaybeAuth
                 $ cached
@@ -372,6 +411,17 @@ handlePluginR plugin pieces = do
 -- assumes that you are using a Persistent database.
 --
 -- Since 1.1.0
+#if MIN_VERSION_persistent(2, 0, 0)
+maybeAuth :: ( YesodAuth master
+             , b ~ YesodPersistBackend master
+             , b ~ PersistEntityBackend val
+             , Key val ~ AuthId master
+             , PersistStore b
+             , PersistEntity val
+             , YesodPersist master
+             , Typeable val
+             ) => HandlerT master IO (Maybe (Entity val))
+#else
 maybeAuth :: ( YesodAuth master
              , PersistMonadBackend (b (HandlerT master IO)) ~ PersistEntityBackend val
              , b ~ YesodPersistBackend master
@@ -381,6 +431,7 @@ maybeAuth :: ( YesodAuth master
              , YesodPersist master
              , Typeable val
              ) => HandlerT master IO (Maybe (Entity val))
+#endif
 maybeAuth = runMaybeT $ do
     aid <- MaybeT maybeAuthId
     MaybeT $ cachedAuth aid
@@ -394,6 +445,18 @@ newtype CachedMaybeAuth val = CachedMaybeAuth { unCachedMaybeAuth :: Maybe val }
 -- full informatin on a given user.
 --
 -- Since 1.2.0
+#if MIN_VERSION_persistent(2, 0, 0)
+type YesodAuthPersist master =
+    ( YesodAuth master
+    , YesodPersistBackend master
+        ~ PersistEntityBackend (AuthEntity master)
+    , Key (AuthEntity master) ~ AuthId master
+    , PersistStore (YesodPersistBackend master)
+    , PersistEntity (AuthEntity master)
+    , YesodPersist master
+    , Typeable (AuthEntity master)
+    )
+#else
 type YesodAuthPersist master =
     ( YesodAuth master
     , PersistMonadBackend (YesodPersistBackend master (HandlerT master IO))
@@ -404,6 +467,7 @@ type YesodAuthPersist master =
     , YesodPersist master
     , Typeable (AuthEntity master)
     )
+#endif
 
 -- | If the @AuthId@ for a given site is a persistent ID, this will give the
 -- value for that entity. E.g.:
@@ -413,6 +477,10 @@ type YesodAuthPersist master =
 --
 -- Since 1.2.0
 type AuthEntity master = KeyEntity (AuthId master)
+#if MIN_VERSION_persistent(2, 0, 0)
+type family KeyEntity key
+type instance KeyEntity (Key x) = x
+#endif
 
 -- | Similar to 'maybeAuthId', but redirects to a login page if user is not
 -- authenticated.
diff --git a/yesod-auth/yesod-auth.cabal b/yesod-auth/yesod-auth.cabal
index cf8b2476..a5a40dd3 100644
--- a/yesod-auth/yesod-auth.cabal
+++ b/yesod-auth/yesod-auth.cabal
@@ -45,8 +45,8 @@ library
                    , unordered-containers
                    , yesod-form              >= 1.3       && < 1.4
                    , transformers            >= 0.2.2
-                   , persistent              >= 1.2       && < 1.4
-                   , persistent-template     >= 1.2       && < 1.4
+                   , persistent              >= 1.2       && < 2.1
+                   , persistent-template     >= 1.2       && < 2.1
                    , http-conduit            >= 1.5
                    , aeson                   >= 0.7
                    , lifted-base             >= 0.1
diff --git a/yesod-form/Yesod/Form/Fields.hs b/yesod-form/Yesod/Form/Fields.hs
index f3861238..00f748b4 100644
--- a/yesod-form/Yesod/Form/Fields.hs
+++ b/yesod-form/Yesod/Form/Fields.hs
@@ -75,7 +75,11 @@ import Data.Maybe (listToMaybe, fromMaybe)
 import qualified Blaze.ByteString.Builder.Html.Utf8 as B
 import Blaze.ByteString.Builder (writeByteString, toLazyByteString)
 import Blaze.ByteString.Builder.Internal.Write (fromWriteList)
+#if MIN_VERSION_persistent(2, 0, 0)
+import Database.Persist (PersistEntityBackend)
+#else
 import Database.Persist (PersistMonadBackend, PersistEntityBackend)
+#endif
 
 import Text.Blaze.Html.Renderer.String (renderHtml)
 import qualified Data.ByteString as S
@@ -555,12 +559,21 @@ optionsPairs opts = do
 optionsEnum :: (MonadHandler m, Show a, Enum a, Bounded a) => m (OptionList a)
 optionsEnum = optionsPairs $ map (\x -> (pack $ show x, x)) [minBound..maxBound]
 
+#if MIN_VERSION_persistent(2, 0, 0)
+optionsPersist :: ( YesodPersist site, PersistEntity a
+                  , PersistQuery (PersistEntityBackend a)
+                  , PathPiece (Key a)
+                  , RenderMessage site msg
+                  , YesodPersistBackend site ~ PersistEntityBackend a
+                  )
+#else
 optionsPersist :: ( YesodPersist site, PersistEntity a
                   , PersistQuery (YesodPersistBackend site (HandlerT site IO))
                   , PathPiece (Key a)
                   , PersistEntityBackend a ~ PersistMonadBackend (YesodPersistBackend site (HandlerT site IO))
                   , RenderMessage site msg
                   )
+#endif
                => [Filter a]
                -> [SelectOpt a]
                -> (a -> msg)
@@ -578,13 +591,24 @@ optionsPersist filts ords toDisplay = fmap mkOptionList $ do
 -- the entire @Entity@.
 --
 -- Since 1.3.2
+#if MIN_VERSION_persistent(2, 0, 0)
+optionsPersistKey
+  :: (YesodPersist site
+     , PersistEntity a
+     , PersistQuery (PersistEntityBackend a)
+     , PathPiece (Key a)
+     , RenderMessage site msg
+     , YesodPersistBackend site ~ PersistEntityBackend a
+     )
+#else
 optionsPersistKey
   :: (YesodPersist site
      , PersistEntity a
      , PersistQuery (YesodPersistBackend site (HandlerT site IO))
      , PathPiece (Key a)
      , RenderMessage site msg
-     , PersistEntityBackend a ~ PersistMonadBackend (YesodPersistBackend site (HandlerT site IO)))
+     , PersistEntityBackend a ~ PersistMonadBackend (YesodDB site))
+#endif
   => [Filter a]
   -> [SelectOpt a]
   -> (a -> msg)
diff --git a/yesod-form/yesod-form.cabal b/yesod-form/yesod-form.cabal
index 668e3c1a..ec6cd546 100644
--- a/yesod-form/yesod-form.cabal
+++ b/yesod-form/yesod-form.cabal
@@ -25,7 +25,7 @@ library
                    , shakespeare
                    , shakespeare-css       >= 1.0
                    , shakespeare-js        >= 1.0.2
-                   , persistent            >= 1.2      && < 1.4
+                   , persistent            >= 1.2      && < 2.1
                    , template-haskell
                    , transformers          >= 0.2.2
                    , data-default
diff --git a/yesod-persistent/Yesod/Persist/Core.hs b/yesod-persistent/Yesod/Persist/Core.hs
index 1a338f3f..7f9b6b05 100644
--- a/yesod-persistent/Yesod/Persist/Core.hs
+++ b/yesod-persistent/Yesod/Persist/Core.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE RankNTypes #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
@@ -19,8 +20,10 @@ module Yesod.Persist.Core
     ) where
 
 import Database.Persist
+#if !MIN_VERSION_persistent(2, 0, 0)
 import Database.Persist.Sql (SqlPersistT, unSqlPersistT)
-import Control.Monad.Trans.Reader (runReaderT)
+#endif
+import Control.Monad.Trans.Reader (ReaderT, runReaderT)
 
 import Yesod.Core
 import Data.Conduit
@@ -31,11 +34,25 @@ import Control.Exception (throwIO)
 import Yesod.Core.Types (HandlerContents (HCError))
 import qualified Database.Persist.Sql as SQL
 
-type YesodDB site = YesodPersistBackend site (HandlerT site IO)
+#if MIN_VERSION_persistent(2, 0, 0)
+unSqlPersistT :: a -> a
+unSqlPersistT = id
+#endif
 
+#if MIN_VERSION_persistent(2, 0, 0)
+type YesodDB site = ReaderT (YesodPersistBackend site) (HandlerT site IO)
+#else
+type YesodDB site = YesodPersistBackend site (HandlerT site IO)
+#endif
+
+#if MIN_VERSION_persistent(2, 0, 0)
+class Monad (YesodDB site) => YesodPersist site where
+    type YesodPersistBackend site
+#else
 class Monad (YesodPersistBackend site (HandlerT site IO)) => YesodPersist site where
     type YesodPersistBackend site :: (* -> *) -> * -> *
-    runDB :: YesodPersistBackend site (HandlerT site IO) a -> HandlerT site IO a
+#endif
+    runDB :: YesodDB site a -> HandlerT site IO a
 
 -- | Helper for creating 'runDB'.
 --
@@ -71,13 +88,17 @@ class YesodPersist site => YesodPersistRunner site where
     getDBRunner :: HandlerT site IO (DBRunner site, HandlerT site IO ())
 
 newtype DBRunner site = DBRunner
-    { runDBRunner :: forall a. YesodPersistBackend site (HandlerT site IO) a -> HandlerT site IO a
+    { runDBRunner :: forall a. YesodDB site a -> HandlerT site IO a
     }
 
 -- | Helper for implementing 'getDBRunner'.
 --
 -- Since 1.2.0
+#if MIN_VERSION_persistent(2, 0, 0)
+defaultGetDBRunner :: YesodPersistBackend site ~ SQL.SqlBackend
+#else
 defaultGetDBRunner :: YesodPersistBackend site ~ SqlPersistT
+#endif
                    => (site -> Pool SQL.Connection)
                    -> HandlerT site IO (DBRunner site, HandlerT site IO ())
 defaultGetDBRunner getPool = do
@@ -106,7 +127,7 @@ defaultGetDBRunner getPool = do
 --
 -- Since 1.2.0
 runDBSource :: YesodPersistRunner site
-            => Source (YesodPersistBackend site (HandlerT site IO)) a
+            => Source (YesodDB site) a
             -> Source (HandlerT site IO) a
 runDBSource src = do
     (dbrunner, cleanup) <- lift getDBRunner
@@ -116,11 +137,16 @@ runDBSource src = do
 -- | Extends 'respondSource' to create a streaming database response body.
 respondSourceDB :: YesodPersistRunner site
                 => ContentType
-                -> Source (YesodPersistBackend site (HandlerT site IO)) (Flush Builder)
+                -> Source (YesodDB site) (Flush Builder)
                 -> HandlerT site IO TypedContent
 respondSourceDB ctype = respondSource ctype . runDBSource
 
 -- | Get the given entity by ID, or return a 404 not found if it doesn't exist.
+#if MIN_VERSION_persistent(2, 0, 0)
+get404 :: (MonadIO m, PersistStore (PersistEntityBackend val), PersistEntity val)
+       => Key val
+       -> ReaderT (PersistEntityBackend val) m val
+#else
 get404 :: ( PersistStore (t m)
           , PersistEntity val
           , Monad (t m)
@@ -129,6 +155,7 @@ get404 :: ( PersistStore (t m)
           , PersistMonadBackend (t m) ~ PersistEntityBackend val
           )
        => Key val -> t m val
+#endif
 get404 key = do
     mres <- get key
     case mres of
@@ -137,6 +164,11 @@ get404 key = do
 
 -- | Get the given entity by unique key, or return a 404 not found if it doesn't
 --   exist.
+#if MIN_VERSION_persistent(2, 0, 0)
+getBy404 :: (PersistUnique (PersistEntityBackend val), PersistEntity val, MonadIO m)
+         => Unique val
+         -> ReaderT (PersistEntityBackend val) m (Entity val)
+#else
 getBy404 :: ( PersistUnique (t m)
             , PersistEntity val
             , m ~ HandlerT site IO
@@ -145,6 +177,7 @@ getBy404 :: ( PersistUnique (t m)
             , PersistEntityBackend val ~ PersistMonadBackend (t m)
             )
          => Unique val -> t m (Entity val)
+#endif
 getBy404 key = do
     mres <- getBy key
     case mres of
@@ -156,8 +189,10 @@ getBy404 key = do
 notFound' :: MonadIO m => m a
 notFound' = liftIO $ throwIO $ HCError NotFound
 
+#if !MIN_VERSION_persistent(2, 0, 0)
 instance MonadHandler m => MonadHandler (SqlPersistT m) where
     type HandlerSite (SqlPersistT m) = HandlerSite m
     liftHandlerT = lift . liftHandlerT
 instance MonadWidget m => MonadWidget (SqlPersistT m) where
     liftWidgetT = lift . liftWidgetT
+#endif
diff --git a/yesod-persistent/test/Yesod/PersistSpec.hs b/yesod-persistent/test/Yesod/PersistSpec.hs
index bf29910c..58cdb2c4 100644
--- a/yesod-persistent/test/Yesod/PersistSpec.hs
+++ b/yesod-persistent/test/Yesod/PersistSpec.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE OverloadedStrings, TemplateHaskell, QuasiQuotes, TypeFamilies #-}
 {-# LANGUAGE EmptyDataDecls, FlexibleContexts, GADTs #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 module Yesod.PersistSpec where
 
 import Test.Hspec
@@ -27,7 +28,7 @@ mkYesod "App" [parseRoutes|
 
 instance Yesod App
 instance YesodPersist App where
-    type YesodPersistBackend App = SqlPersistT
+    type YesodPersistBackend App = SqlBackend
     runDB = defaultRunDB appConfig appPool
 instance YesodPersistRunner App where
     getDBRunner = defaultGetDBRunner appPool
diff --git a/yesod-persistent/yesod-persistent.cabal b/yesod-persistent/yesod-persistent.cabal
index b44499b6..a6ce68f7 100644
--- a/yesod-persistent/yesod-persistent.cabal
+++ b/yesod-persistent/yesod-persistent.cabal
@@ -15,8 +15,8 @@ description:     Some helpers for using Persistent from Yesod.
 library
     build-depends:   base                      >= 4        && < 5
                    , yesod-core                >= 1.2.2    && < 1.3
-                   , persistent                >= 1.2      && < 1.4
-                   , persistent-template       >= 1.2      && < 1.4
+                   , persistent                >= 1.2      && < 2.1
+                   , persistent-template       >= 1.2      && < 2.1
                    , transformers              >= 0.2.2
                    , blaze-builder
                    , conduit