diff --git a/pkgs/development/libraries/haskell/cgrep/default.nix b/pkgs/development/libraries/haskell/cgrep/default.nix
index a49697bccf9d..91f7920fceaf 100644
--- a/pkgs/development/libraries/haskell/cgrep/default.nix
+++ b/pkgs/development/libraries/haskell/cgrep/default.nix
@@ -6,8 +6,8 @@
 
 cabal.mkDerivation (self: {
   pname = "cgrep";
-  version = "6.4.8";
-  sha256 = "0xz2kzrvxxaa67x21dckv7l01s7jhmak7ka0rp8qygx6zjf836wy";
+  version = "6.4.9";
+  sha256 = "1g5np8r5h8hxgyxr3m7595xh7fiq1b8h9w6vm0ly81949lbwclga";
   isLibrary = false;
   isExecutable = true;
   buildDepends = [