diff --git a/changelog.d/5-internal/downgrade-http2 b/changelog.d/5-internal/downgrade-http2
new file mode 100644
index 0000000000..2e7e8cf2e5
--- /dev/null
+++ b/changelog.d/5-internal/downgrade-http2
@@ -0,0 +1 @@
+Depend on http2 fork instead of version 4.0.0
diff --git a/libs/wai-utilities/src/Network/Wai/Utilities/MockServer.hs b/libs/wai-utilities/src/Network/Wai/Utilities/MockServer.hs
index 09863954bd..157fbf51d2 100644
--- a/libs/wai-utilities/src/Network/Wai/Utilities/MockServer.hs
+++ b/libs/wai-utilities/src/Network/Wai/Utilities/MockServer.hs
@@ -21,12 +21,10 @@ module Network.Wai.Utilities.MockServer where
 
 import qualified Control.Concurrent.Async as Async
 import Control.Exception (throw)
-import qualified Control.Exception as E
 import Control.Monad.Catch
 import Control.Monad.Codensity
 import Data.Streaming.Network (bindRandomPortTCP)
 import Imports
-import qualified Network.HTTP2.Client as HTTP2
 import qualified Network.Wai as Wai
 import qualified Network.Wai.Handler.Warp as Warp
 import qualified Network.Wai.Handler.WarpTLS as Warp
@@ -46,10 +44,10 @@ withMockServer app = Codensity $ \k ->
     (liftIO . fst)
     (k . fromIntegral . snd)
 
+-- FUTUREWORK: Ignore HTTP2.ConnectionIsClosed after upgrading to more recent
+-- http2 library.
 ignoreHTTP2NonError :: Maybe Wai.Request -> SomeException -> IO ()
-ignoreHTTP2NonError mr e
-  | Just HTTP2.ConnectionIsClosed <- E.fromException e = pure ()
-  | otherwise = Warp.defaultOnException mr e
+ignoreHTTP2NonError = Warp.defaultOnException
 
 -- | Start a mock warp server on a random port, serving the given Wai application.
 --
diff --git a/libs/wire-api-federation/src/Wire/API/Federation/Error.hs b/libs/wire-api-federation/src/Wire/API/Federation/Error.hs
index 1f6f297e80..6cc12cdeda 100644
--- a/libs/wire-api-federation/src/Wire/API/Federation/Error.hs
+++ b/libs/wire-api-federation/src/Wire/API/Federation/Error.hs
@@ -84,7 +84,7 @@ import qualified Data.Text.Lazy as LT
 import Imports
 import Network.HTTP.Types.Status
 import qualified Network.HTTP.Types.Status as HTTP
-import qualified Network.HTTP2.Client as HTTP2
+import qualified Network.HTTP2.Frame as HTTP2
 import qualified Network.Wai.Utilities.Error as Wai
 import OpenSSL.Session (SomeSSLException)
 import Servant.Client
diff --git a/nix/haskell-pins.nix b/nix/haskell-pins.nix
index fbefc74c8c..83577a7ae2 100644
--- a/nix/haskell-pins.nix
+++ b/nix/haskell-pins.nix
@@ -119,6 +119,13 @@ let
         http-conduit = "http-conduit";
       };
     };
+    http2 = {
+      src = fetchgit {
+        url = "https://github.com/wireapp/http2";
+        rev = "aa3501ad58e1abbd196781fac25a84f41ec2a787";
+        sha256 = "09h86fkk8p7szq08x0iszaq16mhbylxivfc0apvj58d98wl8l6lq";
+      };
+    };
     hspec-wai = {
       src = fetchgit {
         url = "https://github.com/wireapp/hspec-wai";
@@ -213,10 +220,6 @@ let
       version = "0.11.7.5";
       sha256 = "sha256-CfH1YJSGuF4O1aUfdJwUZKRrVzv5nSPhwoI7mf9ewEg=";
     };
-    http2 = {
-      version = "4.0.0";
-      sha256 = "sha256-9rBhklwuuKZXWH4yV4tb7Sp5chR9AmBAMRBztDjx0uI=";
-    };
   };
   # Name -> Source -> Maybe Subpath -> Drv
   mkGitDrv = name: src: subpath: