diff --git a/nix/overlays/haskell-packages.nix b/nix/overlays/haskell-packages.nix
index 8404602d9a..64f06696b9 100644
--- a/nix/overlays/haskell-packages.nix
+++ b/nix/overlays/haskell-packages.nix
@@ -154,7 +154,7 @@ let
           {
             pkg = "witherable";
             ver = "0.4.2";
-            sha256 = "sha256-Um13PQNyfe2ZOe+/TZoWotoyPcmj4tXYNGFqHHK63js=";
+            sha256 = "sha256-M5KOI2qKqf4qdfKUwQ2h+3pF5PfPhtz0dozPUAZVRL0=";
           }
           { });