diff --git a/pkgs/development/libraries/haskell/warp/default.nix b/pkgs/development/libraries/haskell/warp/default.nix
index c67ea5c25e0..75ccd0e6f5d 100644
--- a/pkgs/development/libraries/haskell/warp/default.nix
+++ b/pkgs/development/libraries/haskell/warp/default.nix
@@ -1,4 +1,4 @@
-{ cabal, blazeBuilder, blazeBuilderConduit, caseInsensitive
+{ cabal, async, blazeBuilder, blazeBuilderConduit, caseInsensitive
 , conduit, conduitExtra, doctest, hashable, hspec, HTTP, httpDate
 , httpTypes, HUnit, liftedBase, network, networkConduit, QuickCheck
 , simpleSendfile, streamingCommons, text, time, transformers
@@ -7,8 +7,8 @@
 
 cabal.mkDerivation (self: {
   pname = "warp";
-  version = "2.1.3.3";
-  sha256 = "1dbarrjb6y4cbc1dc265b008b6d5qziqnikdbnbdlrwfzr97cz23";
+  version = "2.1.4";
+  sha256 = "090xbjqwj8wzxiaal2jdsk7dbqv07c1cw32w7v8xxi2dkvv6nwbb";
   buildDepends = [
     blazeBuilder blazeBuilderConduit caseInsensitive conduit
     conduitExtra hashable httpDate httpTypes liftedBase network
@@ -16,7 +16,7 @@ cabal.mkDerivation (self: {
     unixCompat void wai
   ];
   testDepends = [
-    blazeBuilder blazeBuilderConduit caseInsensitive conduit
+    async blazeBuilder blazeBuilderConduit caseInsensitive conduit
     conduitExtra doctest hashable hspec HTTP httpDate httpTypes HUnit
     liftedBase network networkConduit QuickCheck simpleSendfile
     streamingCommons text time transformers unixCompat void wai