diff --git a/pkgs/development/libraries/haskell/attoparsec/0.11.1.0.nix b/pkgs/development/libraries/haskell/attoparsec/0.11.2.1.nix
similarity index 86%
rename from pkgs/development/libraries/haskell/attoparsec/0.11.1.0.nix
rename to pkgs/development/libraries/haskell/attoparsec/0.11.2.1.nix
index bd7bdc745b2..2a2117a1a05 100644
--- a/pkgs/development/libraries/haskell/attoparsec/0.11.1.0.nix
+++ b/pkgs/development/libraries/haskell/attoparsec/0.11.2.1.nix
@@ -4,8 +4,8 @@
 
 cabal.mkDerivation (self: {
   pname = "attoparsec";
-  version = "0.11.1.0";
-  sha256 = "09mks6lbzmqmdz6s10lvdklmc0mydd1sk5hphhnybp3yr4pvh7jc";
+  version = "0.11.2.1";
+  sha256 = "1grvmhxiqn02wbng0wd9zqc4c51wrbxar1b26agc3p9i09ngbs1w";
   buildDepends = [ deepseq scientific text ];
   testDepends = [
     QuickCheck testFramework testFrameworkQuickcheck2 text
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 81c0a99e4a0..846c24204b8 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -142,7 +142,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
   haskellPlatformArgs_future = self : {
     inherit (self) cabal ghc;
     async        = self.async_2_0_1_5;
-    attoparsec   = self.attoparsec_0_11_1_0;
+    attoparsec   = self.attoparsec_0_11_2_1;
     caseInsensitive = self.caseInsensitive_1_1_0_3;
     cgi          = self.cgi_3001_1_8_5;
     fgl          = self.fgl_5_4_2_4;
@@ -593,7 +593,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
   attoLisp = callPackage ../development/libraries/haskell/atto-lisp {};
 
   attoparsec_0_10_4_0 = callPackage ../development/libraries/haskell/attoparsec/0.10.4.0.nix {};
-  attoparsec_0_11_1_0 = callPackage ../development/libraries/haskell/attoparsec/0.11.1.0.nix {};
+  attoparsec_0_11_2_1 = callPackage ../development/libraries/haskell/attoparsec/0.11.2.1.nix {};
   attoparsec = self.attoparsec_0_10_4_0;
 
   attoparsecBinary = callPackage ../development/libraries/haskell/attoparsec-binary {};