diff --git a/pkgs/development/libraries/haskell/kan-extensions/default.nix b/pkgs/development/libraries/haskell/kan-extensions/default.nix
index 5f9aadd69697..c0ffaed799d3 100644
--- a/pkgs/development/libraries/haskell/kan-extensions/default.nix
+++ b/pkgs/development/libraries/haskell/kan-extensions/default.nix
@@ -1,16 +1,16 @@
 # This file was auto-generated by cabal2nix. Please do NOT edit manually!
 
 { cabal, adjunctions, comonad, contravariant, distributive, free
-, mtl, pointed, semigroupoids, speculation, transformers
+, mtl, pointed, semigroupoids, transformers
 }:
 
 cabal.mkDerivation (self: {
   pname = "kan-extensions";
-  version = "4.0.3";
-  sha256 = "05zqlxm6i66d996jcpjhnmij28a4zwc0l0nc9cyxamfwmyd9754b";
+  version = "4.1";
+  sha256 = "1dg9q6rahgvsnsnd76r6a3harrllq3pzz9250cakgqip4n02dji1";
   buildDepends = [
     adjunctions comonad contravariant distributive free mtl pointed
-    semigroupoids speculation transformers
+    semigroupoids transformers
   ];
   meta = {
     homepage = "http://github.com/ekmett/kan-extensions/";