diff --git a/.gitignore b/.gitignore
index 094ee2b3..fb2480d4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 .stack-work/
 stack*.lock
+dist-newstyle
\ No newline at end of file
diff --git a/http2-client.cabal b/http2-client.cabal
index 2c2217e4..7df05c16 100644
--- a/http2-client.cabal
+++ b/http2-client.cabal
@@ -22,19 +22,20 @@ library
                      , Network.HTTP2.Client.RawConnection
   other-modules:       Network.HTTP2.Client.Channels
                      , Network.HTTP2.Client.Dispatch
-  build-depends:       base >= 4.7 && < 4.20
+  build-depends:       base >= 4.7 && < 4.21
                      , async >= 2.1 && < 2.3
                      , bytestring >= 0.11 && < 0.13
+                     , case-insensitive >= 1.2 && < 1.3
                      , containers >= 0.5 && < 0.8
                      , deepseq >= 1.4 && < 1.6
-                     , http2 >= 4.1 && < 6
+                     , http2 >= 4.1 && < 5.3
                      , lifted-async >= 0.10 && < 0.11
                      , lifted-base >= 0.2 && < 0.3
                      , mtl >= 2.2 && < 2.4
-                     , network >= 2.6 && < 3.2
+                     , network >= 2.6 && < 3.3
                      , stm >= 2.4 && < 2.8
                      , time >= 1.8 && < 1.15
-                     , tls >= 1.8.0 && < 2.0.3
+                     , tls >= 1.8.0 && < 2.2
                      , transformers-base >= 0.4 && < 0.5
   default-language:    Haskell2010
 
diff --git a/src/Network/HTTP2/Client.hs b/src/Network/HTTP2/Client.hs
index 0e4b8893..55d5d2d7 100644
--- a/src/Network/HTTP2/Client.hs
+++ b/src/Network/HTTP2/Client.hs
@@ -2,6 +2,7 @@
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PackageImports #-}
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE RecordWildCards #-}
 
@@ -61,8 +62,10 @@ import Control.Concurrent.MVar.Lifted (newEmptyMVar, newMVar, putMVar, takeMVar,
 import Control.Exception.Lifted (SomeException, bracket, catch, throwIO)
 import Control.Monad (forM_, forever, void, when)
 import Control.Monad.IO.Class (liftIO)
+import Data.Bifunctor (first)
 import Data.ByteString (ByteString)
 import qualified Data.ByteString as ByteString
+import qualified Data.CaseInsensitive as CI
 import Data.Foldable (foldl')
 import Data.IORef.Lifted (atomicModifyIORef', newIORef, readIORef)
 import Data.Maybe (fromMaybe)
@@ -78,7 +81,12 @@ import Network.HTTP2.Client.FrameConnection
 
 #if MIN_VERSION_http2(5,0,0)
 import "http2" Network.HTTP2.Client (Settings, maxFrameSize, initialWindowSize, maxConcurrentStreams, headerTableSize, enablePush, maxHeaderListSize)
+#if !MIN_VERSION_http2(5,2,0)
+pattern SettingsTokenHeaderTableSize :: SettingsKey
+pattern SettingsTokenHeaderTableSize = SettingsHeaderTableSize
 #endif
+#endif
+
 
 {- | Offers credit-based flow-control.
 
@@ -260,7 +268,7 @@ data StreamThread = CST
 -- | Record holding functions one can call while in an HTTP2 client stream.
 data Http2Stream = Http2Stream
     { _headers ::
-        HPACK.HeaderList ->
+        HeaderList ->
         (FrameFlags -> FrameFlags) ->
         ClientIO StreamThread
     -- ^ Starts the stream with HTTP headers. Flags modifier can use
@@ -285,7 +293,7 @@ data Http2Stream = Http2Stream
 
 Trailers should be the last thing sent over a stream.
 -}
-trailers :: Http2Stream -> HPACK.HeaderList -> (FrameFlags -> FrameFlags) -> ClientIO ()
+trailers :: Http2Stream -> HeaderList -> (FrameFlags -> FrameFlags) -> ClientIO ()
 trailers stream hdrs flagmod = void $ _headers stream hdrs flagmod
 
 {- | Handler upon receiving a PUSH_PROMISE from the server.
@@ -687,7 +695,7 @@ dispatchControlFramesStep windowUpdatesChan controlFrame@(fh, payload) control@(
                     maybe
                         (return ())
                         (_applySettings _dispatchControlHpackEncoder)
-                        (lookup SettingsHeaderTableSize settsList)
+                        (lookup SettingsTokenHeaderTableSize settsList)
                 _dispatchControlAckSettings
             | otherwise -> do
                 handler <- lookupAndReleaseSetSettingsHandler control
@@ -756,7 +764,7 @@ dispatchHPACKFramesStep ::
     DispatchHPACK ->
     HPACKStepResult
 dispatchHPACKFramesStep (fh, fp) (DispatchHPACK{..}) =
-    let (decision, pattern) = case fp of
+    let (decision, pattern') = case fp of
             PushPromiseFrame ppSid hbf -> do
                 (OpenPushPromise sid ppSid, Right hbf)
             HeadersFrame _ hbf ->
@@ -766,11 +774,19 @@ dispatchHPACKFramesStep (fh, fp) (DispatchHPACK{..}) =
                 (ForwardHeader sid, Left err)
             _ ->
                 error "wrong TypeId"
-     in go fh decision pattern
+     in go fh decision pattern'
   where
     sid :: StreamId
     sid = HTTP2.streamId fh
 
+#if MIN_VERSION_http2(5,2,0)
+    compat :: [Header] -> HeaderList
+    compat = fmap $ first CI.original
+#else
+    compat :: HeaderList -> HeaderList
+    compat = id
+#endif
+
     go :: FrameHeader -> HPACKLoopDecision -> Either ErrorCode ByteString -> HPACKStepResult
     go curFh decision (Right buffer) =
         if not $ HTTP2.testEndHeader (HTTP2.flags curFh)
@@ -794,9 +810,9 @@ dispatchHPACKFramesStep (fh, fp) (DispatchHPACK{..}) =
                     )
             else case decision of
                 ForwardHeader sId ->
-                    FinishedWithHeaders curFh sId (decodeHeader _dispatchHPACKDynamicTable buffer)
+                    FinishedWithHeaders curFh sId $ fmap compat $ decodeHeader _dispatchHPACKDynamicTable buffer
                 OpenPushPromise parentSid newSid ->
-                    FinishedWithPushPromise curFh parentSid newSid (decodeHeader _dispatchHPACKDynamicTable buffer)
+                    FinishedWithPushPromise curFh parentSid newSid $ fmap compat $ decodeHeader _dispatchHPACKDynamicTable buffer
     go curFh _ (Left err) =
         FailedHeaders curFh sid err
 
@@ -1032,13 +1048,13 @@ compat_updateSettings :: Settings -> SettingsList -> Settings
 #if MIN_VERSION_http2(5,0,0)
 compat_updateSettings settings kvs = foldl' update settings kvs
   where
-    update def (SettingsHeaderTableSize,x)      = def { headerTableSize = x }
+    update def (SettingsTokenHeaderTableSize,x) = def { headerTableSize = x }
     -- fixme: x should be 0 or 1
     update def (SettingsEnablePush,x)           = def { enablePush = x > 0 }
     update def (SettingsMaxConcurrentStreams,x) = def { maxConcurrentStreams = Just x }
     update def (SettingsInitialWindowSize,x)    = def { initialWindowSize = x }
     update def (SettingsMaxFrameSize,x)         = def { maxFrameSize = x }
-    update def (SettingsMaxHeaderListSize,x)   = def { maxHeaderListSize = Just x }
+    update def (SettingsMaxHeaderListSize,x)    = def { maxHeaderListSize = Just x }
     update def _                                = def
 
 #else
diff --git a/src/Network/HTTP2/Client/Dispatch.hs b/src/Network/HTTP2/Client/Dispatch.hs
index 1593b34a..0b5a1c57 100644
--- a/src/Network/HTTP2/Client/Dispatch.hs
+++ b/src/Network/HTTP2/Client/Dispatch.hs
@@ -9,6 +9,7 @@ import Control.Exception (throwIO)
 import Control.Monad.Base (MonadBase, liftBase)
 import Data.ByteString (ByteString)
 import qualified Data.ByteString.Internal as ByteString
+import qualified Data.CaseInsensitive as CI
 import Data.IORef.Lifted (IORef, atomicModifyIORef', newIORef, readIORef)
 import Data.IntMap (IntMap)
 import qualified Data.IntMap as IntMap
@@ -17,13 +18,15 @@ import Foreign.Marshal.Alloc (finalizerFree, mallocBytes)
 import GHC.Exception (Exception)
 import Network.HPACK as HPACK
 import qualified Network.HPACK.Token as HPACK
+import Network.HTTP2.Client.Channels
+import Network.HTTP2.Client.Exceptions
 import Network.HTTP2.Frame as HTTP2
 #if MIN_VERSION_http2(5,0,0)
 import "http2" Network.HTTP2.Client (Settings, defaultSettings)
+#if MIN_VERSION_http2(5,2,0)
+type HeaderList = [(ByteString, ByteString)]
+#endif
 #endif
-
-import Network.HTTP2.Client.Channels
-import Network.HTTP2.Client.Exceptions
 
 type DispatchChan = FramesChan FrameDecodeError
 
diff --git a/src/Network/HTTP2/Client/Helpers.hs b/src/Network/HTTP2/Client/Helpers.hs
index 575fe260..56584b02 100644
--- a/src/Network/HTTP2/Client/Helpers.hs
+++ b/src/Network/HTTP2/Client/Helpers.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 
 -- | A toolbox with high-level functions to interact with an established HTTP2
@@ -11,7 +12,7 @@ module Network.HTTP2.Client.Helpers (
   -- * Sending and receiving HTTP body
     upload
   , waitStream
-  , fromStreamResult 
+  , fromStreamResult
   , StreamResult
   , StreamResponse
   -- * Diagnostics
@@ -23,12 +24,16 @@ module Network.HTTP2.Client.Helpers (
 import           Data.Time.Clock (UTCTime, getCurrentTime)
 import qualified Network.HTTP2.Frame as HTTP2
 import qualified Network.HPACK as HPACK
+#if !MIN_VERSION_http2(5,2,0)
+import           Network.HPACK as HPACK (HeaderList)
+#endif
 import           Data.ByteString (ByteString)
 import qualified Data.ByteString as ByteString
 import           Control.Concurrent.Lifted (threadDelay)
 import           Control.Concurrent.Async.Lifted (race)
 
 import Network.HTTP2.Client
+import Network.HTTP2.Client.Dispatch
 import Network.HTTP2.Client.Exceptions
 
 -- | Opaque type to express an action which timed out.
@@ -57,10 +62,10 @@ ping conn timeout msg = do
 -- | Result containing the unpacked headers and all frames received in on a
 -- stream. See 'StreamResponse' and 'fromStreamResult' to get a higher-level
 -- utility.
-type StreamResult = (Either HTTP2.ErrorCode HPACK.HeaderList, [Either HTTP2.ErrorCode ByteString], Maybe HPACK.HeaderList)
+type StreamResult = (Either HTTP2.ErrorCode HeaderList, [Either HTTP2.ErrorCode ByteString], Maybe HeaderList)
 
 -- | An HTTP2 response, once fully received, is made of headers and a payload.
-type StreamResponse = (HPACK.HeaderList, ByteString, Maybe HPACK.HeaderList)
+type StreamResponse = (HeaderList, ByteString, Maybe HeaderList)
 
 -- | Uploads a whole HTTP body at a time.
 --