diff --git a/patches/133661.patch b/patches/133661.patch
new file mode 100644
index 00000000..2569f7d6
--- /dev/null
+++ b/patches/133661.patch
@@ -0,0 +1,29 @@
+From baca6e6b695df1c517210df363ad6df1f25706e6 Mon Sep 17 00:00:00 2001
+From: Charlotte Van Petegem <charlotte@vanpetegem.me>
+Date: Thu, 12 Aug 2021 21:48:36 +0200
+Subject: [PATCH] mu: 1.6.2 -> 1.6.3
+
+---
+ pkgs/tools/networking/mu/default.nix | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/pkgs/tools/networking/mu/default.nix b/pkgs/tools/networking/mu/default.nix
+index e224cc33a03c6b..468bc127228a76 100644
+--- a/pkgs/tools/networking/mu/default.nix
++++ b/pkgs/tools/networking/mu/default.nix
+@@ -7,13 +7,13 @@
+ 
+ stdenv.mkDerivation rec {
+   pname = "mu";
+-  version = "1.6.2";
++  version = "1.6.3";
+ 
+   src = fetchFromGitHub {
+     owner  = "djcb";
+     repo   = "mu";
+     rev    = version;
+-    sha256 = "EYERtDYIf0aw9nMLFZPGZ5s1i+erSq9H3tP29KwCAgQ=";
++    sha256 = "hmP2bcoBWMd2GZBE8XtJ5QePpWnkJV5pu69aDmL5V4g=";
+   };
+ 
+   postPatch = lib.optionalString (batchSize != null) ''