diff --git a/pkgs/development/libraries/haskell/cereal/default.nix b/pkgs/development/libraries/haskell/cereal/default.nix
index a28ea11c511..4770d5216e2 100644
--- a/pkgs/development/libraries/haskell/cereal/default.nix
+++ b/pkgs/development/libraries/haskell/cereal/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "cereal";
-  version = "0.3.5.2";
-  sha256 = "0yjxvhagsm552idfrs6d9lzlz6x5878xj1vfg0zxf8w1kixgghil";
+  version = "0.4.0.0";
+  sha256 = "0q6lrfa2p70mh3d08mbj89anc3p9ycy6wyyiycj5pm62kcimv7rj";
   meta = {
     description = "A binary serialization library";
     license = self.stdenv.lib.licenses.bsd3;