diff --git a/pkgs/development/libraries/haskell/bert/default.nix b/pkgs/development/libraries/haskell/bert/default.nix
index 2857a21a8d9..e2d482b364e 100644
--- a/pkgs/development/libraries/haskell/bert/default.nix
+++ b/pkgs/development/libraries/haskell/bert/default.nix
@@ -5,8 +5,8 @@
 
 cabal.mkDerivation (self: {
   pname = "bert";
-  version = "1.2.2";
-  sha256 = "1dlq9fl5d2adprcybs4d4cyhj9q2c1l4kcc6vnnyhbyn201gxgpn";
+  version = "1.2.2.1";
+  sha256 = "1x23grykamyclx6a5jzyqwp3hwr2ma61zvmz89f3cj06sa49cgs0";
   buildDepends = [
     binary binaryConduit conduit mtl network networkConduit parsec time
     void