diff --git a/pkgs/tools/networking/mu/default.nix b/pkgs/tools/networking/mu/default.nix
index 2104768e3b9f..3710cffb9908 100644
--- a/pkgs/tools/networking/mu/default.nix
+++ b/pkgs/tools/networking/mu/default.nix
@@ -3,12 +3,12 @@
 , gtk3, webkit, libsoup, icu, withMug ? false /* doesn't build with current gtk3 */ }:
 
 stdenv.mkDerivation rec {
-  version = "0.9.12";
+  version = "0.9.13";
   name = "mu-${version}";
 
   src = fetchurl {
     url = "https://github.com/djcb/mu/archive/v${version}.tar.gz";
-    sha256 = "1bxryacmas2llj68m2dv8dr1vwx8f5k2i2azh69jajkpqx7i4wdq";
+    sha256 = "0wj33pma8xgjvn2akk7khzbycwn4c9sshxvzdph9dnpy7gyqxj51";
   };
 
   buildInputs =