diff --git a/pkgs/development/libraries/haskell/monad-par/0.3.4.2.nix b/pkgs/development/libraries/haskell/monad-par/0.3.4.3.nix
similarity index 90%
rename from pkgs/development/libraries/haskell/monad-par/0.3.4.2.nix
rename to pkgs/development/libraries/haskell/monad-par/0.3.4.3.nix
index ab875b34c36..22b9d359faf 100644
--- a/pkgs/development/libraries/haskell/monad-par/0.3.4.2.nix
+++ b/pkgs/development/libraries/haskell/monad-par/0.3.4.3.nix
@@ -6,8 +6,8 @@
 
 cabal.mkDerivation (self: {
   pname = "monad-par";
-  version = "0.3.4.2";
-  sha256 = "1k10m4w2g92psahsvcyi98sc31wg5anijp46lbsipi2r2gxxc7bs";
+  version = "0.3.4.3";
+  sha256 = "1yf1s44r2mkqimi26g9y4zxqgs4yizfmigfx9mkfgbqsn2a8sff6";
   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 879e2d61fdb..adc86c6d00c 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1407,8 +1407,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
   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_2 = callPackage ../development/libraries/haskell/monad-par/0.3.4.2.nix {};
-  monadPar = self.monadPar_0_3_4_2;
+  monadPar_0_3_4_3 = callPackage ../development/libraries/haskell/monad-par/0.3.4.3.nix {};
+  monadPar = self.monadPar_0_3_4_3;
 
   monadParExtras = callPackage ../development/libraries/haskell/monad-par-extras {};