diff --git a/pkgs/development/libraries/haskell/llvm-general-pure/3.4.1.0.nix b/pkgs/development/libraries/haskell/llvm-general-pure/3.4.2.1.nix
similarity index 86%
rename from pkgs/development/libraries/haskell/llvm-general-pure/3.4.1.0.nix
rename to pkgs/development/libraries/haskell/llvm-general-pure/3.4.2.1.nix
index 200d8d00b446..460de2de5d42 100644
--- a/pkgs/development/libraries/haskell/llvm-general-pure/3.4.1.0.nix
+++ b/pkgs/development/libraries/haskell/llvm-general-pure/3.4.2.1.nix
@@ -4,8 +4,8 @@
 
 cabal.mkDerivation (self: {
   pname = "llvm-general-pure";
-  version = "3.4.1.0";
-  sha256 = "0cjzqw9k6x8akbgx4rdigvhjhfv9zlq40p789invdc514qmxhr6q";
+  version = "3.4.2.1";
+  sha256 = "0wdx8zk1r7s3chryvwpm8hc73xvhklbmxd998zpvimv4ywil2f67";
   buildDepends = [ mtl parsec setenv transformers ];
   testDepends = [
     HUnit mtl QuickCheck testFramework testFrameworkHunit
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 15ba3d011616..0226294ced1f 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1641,8 +1641,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
   llvmGeneral = self.llvmGeneral_3_4_1_0;
 
   llvmGeneralPure_3_3_8_2 = callPackage ../development/libraries/haskell/llvm-general-pure/3.3.8.2.nix { };
-  llvmGeneralPure_3_4_1_0 = callPackage ../development/libraries/haskell/llvm-general-pure/3.4.1.0.nix {};
-  llvmGeneralPure = self.llvmGeneralPure_3_4_1_0;
+  llvmGeneralPure_3_4_2_1 = callPackage ../development/libraries/haskell/llvm-general-pure/3.4.2.1.nix {};
+  llvmGeneralPure = self.llvmGeneralPure_3_4_2_1;
 
   lrucache = callPackage ../development/libraries/haskell/lrucache {};