diff --git a/pkgs/development/libraries/haskell/extensible-effects/default.nix b/pkgs/development/libraries/haskell/extensible-effects/default.nix
index 2bae81325ae..310e0f37dd0 100644
--- a/pkgs/development/libraries/haskell/extensible-effects/default.nix
+++ b/pkgs/development/libraries/haskell/extensible-effects/default.nix
@@ -1,14 +1,17 @@
 # This file was auto-generated by cabal2nix. Please do NOT edit manually!
 
-{ cabal, HUnit, QuickCheck, testFramework, testFrameworkHunit
-, testFrameworkQuickcheck2, transformers, transformersBase
+{ cabal, free, HUnit, kanExtensions, QuickCheck, testFramework
+, testFrameworkHunit, testFrameworkQuickcheck2, transformers
+, transformersBase
 }:
 
 cabal.mkDerivation (self: {
   pname = "extensible-effects";
-  version = "1.7.1.2";
-  sha256 = "1mvyiqlga6al81j4b4rg9yl46ml5s0hnx1g2hyvqljzr12njmajv";
-  buildDepends = [ transformers transformersBase ];
+  version = "1.8.1.0";
+  sha256 = "0ssnb1c63lnal6k8f1v36scwqr8m430gq0ssss7r8ndqcbpnlc64";
+  buildDepends = [
+    free kanExtensions transformers transformersBase
+  ];
   testDepends = [
     HUnit QuickCheck testFramework testFrameworkHunit
     testFrameworkQuickcheck2