diff --git a/pkgs/development/libraries/haskell/ansi-wl-pprint/default.nix b/pkgs/development/libraries/haskell/ansi-wl-pprint/default.nix
index 468b35136a33..5730588ab9e4 100755
--- a/pkgs/development/libraries/haskell/ansi-wl-pprint/default.nix
+++ b/pkgs/development/libraries/haskell/ansi-wl-pprint/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "ansi-wl-pprint";
-  version = "0.6.3";
-  sha256 = "1cpkfn1ld0sjysksdsxxwwy1b17s4smmzk8y88y9mb81vgwlalkl";
+  version = "0.6.4";
+  sha256 = "0zrhzkmc5ki6q9ac5l16lhnyf9z2raj78gj9n0a7530rcv4ak3k0";
   isLibrary = true;
   isExecutable = true;
   buildDepends = [ ansiTerminal ];