diff --git a/pkgs/development/libraries/haskell/monad-par/0.3.4.5.nix b/pkgs/development/libraries/haskell/monad-par/0.3.4.6.nix
similarity index 90%
rename from pkgs/development/libraries/haskell/monad-par/0.3.4.5.nix
rename to pkgs/development/libraries/haskell/monad-par/0.3.4.6.nix
index 58cbb522fa2..911d984a88c 100644
--- a/pkgs/development/libraries/haskell/monad-par/0.3.4.5.nix
+++ b/pkgs/development/libraries/haskell/monad-par/0.3.4.6.nix
@@ -6,8 +6,8 @@
 
 cabal.mkDerivation (self: {
   pname = "monad-par";
-  version = "0.3.4.5";
-  sha256 = "0xwjx3l9ssyxaa49v8kz7ic54va1qy6dqa1z5gvww7a5gw1ll81p";
+  version = "0.3.4.6";
+  sha256 = "1k345fpq31jg0mvfk8ap03wscnx8dvlp65gr567vai9ym1ahk6zy";
   buildDepends = [
     abstractDeque abstractPar deepseq monadParExtras mtl mwcRandom
     parallel
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 9747583549d..af8eb5ea7df 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1536,8 +1536,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
   monadLogger = callPackage ../development/libraries/haskell/monad-logger {};
 
   monadPar_0_1_0_3 = callPackage ../development/libraries/haskell/monad-par/0.1.0.3.nix {};
-  monadPar_0_3_4_5 = callPackage ../development/libraries/haskell/monad-par/0.3.4.5.nix {};
-  monadPar = self.monadPar_0_3_4_5;
+  monadPar_0_3_4_6 = callPackage ../development/libraries/haskell/monad-par/0.3.4.6.nix {};
+  monadPar = self.monadPar_0_3_4_6;
 
   monadParExtras = callPackage ../development/libraries/haskell/monad-par-extras {};