diff --git a/pkgs/development/libraries/haskell/permutation/default.nix b/pkgs/development/libraries/haskell/permutation/default.nix
index 4f38dfcaa12f..f44ab16f5637 100644
--- a/pkgs/development/libraries/haskell/permutation/default.nix
+++ b/pkgs/development/libraries/haskell/permutation/default.nix
@@ -2,11 +2,11 @@
 
 cabal.mkDerivation (self: {
   pname = "permutation";
-  version = "0.4.1";
-  sha256 = "0fgw4ivs8sa18fyphwr3mzp2v7ha2nz2yf3a7jmz9ymqdf2xws97";
+  version = "0.5.0.4";
+  sha256 = "0kl5yw1as2y8yf2ac2f6v7g8k7mzjqw5fdh18a6m3jfhjw9rcqf7";
   doCheck = false;
   meta = {
-    homepage = "http://stat.stanford.edu/~patperry/code/permutation";
+    homepage = "https://github.com/spacekitteh/permutation";
     description = "A library for permutations and combinations";
     license = self.stdenv.lib.licenses.bsd3;
     platforms = self.ghc.meta.platforms;