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-rw-r--r--pkgs/development/libraries/haskell/either/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/libraries/haskell/either/default.nix b/pkgs/development/libraries/haskell/either/default.nix
index 67c1962cbe9c..93dfd043c907 100644
--- a/pkgs/development/libraries/haskell/either/default.nix
+++ b/pkgs/development/libraries/haskell/either/default.nix
@@ -3,8 +3,8 @@
 
 cabal.mkDerivation (self: {
   pname = "either";
-  version = "3.4.1";
-  sha256 = "1cq4glqhxz9k8fxf0dc8b6hcxxfn4yci6h7wmfkmkfq5ca61ax1b";
+  version = "4.0";
+  sha256 = "07axaq43cqyglndr5az7ns4mvkjmybq6z8s32l1jxc5x7532scwr";
   buildDepends = [
     MonadRandom mtl semigroupoids semigroups transformers
   ];