diff --git a/pkgs/development/libraries/haskell/warp/default.nix b/pkgs/development/libraries/haskell/warp/default.nix
index 6a54909d6d41..b0c3c7205b3a 100644
--- a/pkgs/development/libraries/haskell/warp/default.nix
+++ b/pkgs/development/libraries/haskell/warp/default.nix
@@ -1,16 +1,16 @@
 { cabal, blazeBuilder, blazeBuilderConduit, caseInsensitive
-, conduit, httpTypes, liftedBase, network, networkConduit
+, conduit, hashable, httpTypes, liftedBase, network, networkConduit
 , simpleSendfile, transformers, unixCompat, void, wai
 }:
 
 cabal.mkDerivation (self: {
   pname = "warp";
-  version = "1.3.1.1";
-  sha256 = "1y0p36nh43wilk110dxpvsws6blrjpik4w9aqj5i1r97wn7xg9ax";
+  version = "1.3.1.2";
+  sha256 = "11y1dwzvfhr4fhlh5j2ydwj4d3r92qm55rn9xwbfxmr0vmvm78b5";
   buildDepends = [
-    blazeBuilder blazeBuilderConduit caseInsensitive conduit httpTypes
-    liftedBase network networkConduit simpleSendfile transformers
-    unixCompat void wai
+    blazeBuilder blazeBuilderConduit caseInsensitive conduit hashable
+    httpTypes liftedBase network networkConduit simpleSendfile
+    transformers unixCompat void wai
   ];
   meta = {
     homepage = "http://github.com/yesodweb/wai";