diff --git a/pkgs/development/libraries/haskell/cgrep/default.nix b/pkgs/development/libraries/haskell/cgrep/default.nix
index 3563abb0a856..e19cac2b2ec3 100644
--- a/pkgs/development/libraries/haskell/cgrep/default.nix
+++ b/pkgs/development/libraries/haskell/cgrep/default.nix
@@ -1,18 +1,18 @@
 # This file was auto-generated by cabal2nix. Please do NOT edit manually!
 
-{ cabal, ansiTerminal, cmdargs, dlist, filepath, regexPosix, safe
-, split, stm, stringsearch, unorderedContainers
+{ cabal, ansiTerminal, cmdargs, dlist, either, filepath, mtl
+, regexPosix, safe, split, stm, stringsearch, unorderedContainers
 }:
 
 cabal.mkDerivation (self: {
   pname = "cgrep";
-  version = "6.4.5";
-  sha256 = "0pp3gfy8dvdbv40vfy3dhqymjp0knnbzv9hmbc18f3s8zpy4lis0";
+  version = "6.4.6";
+  sha256 = "13plsh6411k273qllpkcrkakwxcdmw0p6arj0j3gdqa7bbxii99s";
   isLibrary = false;
   isExecutable = true;
   buildDepends = [
-    ansiTerminal cmdargs dlist filepath regexPosix safe split stm
-    stringsearch unorderedContainers
+    ansiTerminal cmdargs dlist either filepath mtl regexPosix safe
+    split stm stringsearch unorderedContainers
   ];
   meta = {
     homepage = "http://awgn.github.io/cgrep/";