diff --git a/pkgs/tools/networking/mu/default.nix b/pkgs/tools/networking/mu/default.nix
index 0544b6d1ec1..8c09f1e430f 100644
--- a/pkgs/tools/networking/mu/default.nix
+++ b/pkgs/tools/networking/mu/default.nix
@@ -14,13 +14,13 @@
 
 stdenv.mkDerivation rec {
   pname = "mu";
-  version = "1.8.11";
+  version = "1.8.13";
 
   src = fetchFromGitHub {
     owner = "djcb";
     repo = "mu";
     rev = "v${version}";
-    hash = "sha256-IEfwAAUqEGtN4vww0pfW7iuIY/U3eqzC+MJsqtossCw=";
+    hash = "sha256-uXrJOBF3X8UF1ktTfAoYgzc0QBLvyzzGQVJVfs8tjng=";
   };
 
   postPatch = ''