diff --git a/pkgs/development/libraries/haskell/syb/0.4.1.nix b/pkgs/development/libraries/haskell/syb/0.4.2.nix
similarity index 83%
rename from pkgs/development/libraries/haskell/syb/0.4.1.nix
rename to pkgs/development/libraries/haskell/syb/0.4.2.nix
index 38c4f2cae3f..fd67f63ced5 100644
--- a/pkgs/development/libraries/haskell/syb/0.4.1.nix
+++ b/pkgs/development/libraries/haskell/syb/0.4.2.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "syb";
-  version = "0.4.1";
-  sha256 = "1lkh4rrqdzvb8kyry07x2z88v478hrw5cp8wmhjgpg0ck8ywncma";
+  version = "0.4.2";
+  sha256 = "1gvyw2gbccip24wpp9xi6qgwvg4m5cijhzz1v51wvyamqv4p2b8l";
   testDepends = [ HUnit mtl ];
   doCheck = self.stdenv.lib.versionOlder self.ghc.version "7.9";
   meta = {
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index a2bd99a7ca9..6a818c637d7 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -2029,8 +2029,8 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
   syb_0_3_6_2 = callPackage ../development/libraries/haskell/syb/0.3.6.2.nix {};
   syb_0_3_7 = callPackage ../development/libraries/haskell/syb/0.3.7.nix {};
   syb_0_4_0 = callPackage ../development/libraries/haskell/syb/0.4.0.nix {};
-  syb_0_4_1 = callPackage ../development/libraries/haskell/syb/0.4.1.nix {};
-  syb = self.syb_0_4_1;
+  syb_0_4_2 = callPackage ../development/libraries/haskell/syb/0.4.2.nix {};
+  syb = self.syb_0_4_2;
 
   sybWithClass = callPackage ../development/libraries/haskell/syb/syb-with-class.nix {};