diff --git a/flake.lock b/flake.lock
index c0cf7bf9..a483828c 100644
--- a/flake.lock
+++ b/flake.lock
@@ -92,11 +92,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1630850248,
-        "narHash": "sha256-OzJi6Olf7mSVhGt3W7qOMVP5Qk1lH60zlHeCcITzfv0=",
+        "lastModified": 1630938467,
+        "narHash": "sha256-GiSjPKDmFJPaM10lMWhwOrZViAB2kLX6NsHjRSZ/vWE=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "23d5823337f4502dfa17e192d8c53a47cabcb6b4",
+        "rev": "efcfe3676268c789e78a22b20a94c00227d20bc8",
         "type": "github"
       },
       "original": {
diff --git a/patches/136864.patch b/patches/136864.patch
deleted file mode 100644
index c1c11a6b..00000000
--- a/patches/136864.patch
+++ /dev/null
@@ -1,29 +0,0 @@
-From d4a0f34cceacfea469355550379f0bae8e9e6fbc Mon Sep 17 00:00:00 2001
-From: Charlotte Van Petegem <charlotte@vanpetegem.me>
-Date: Mon, 6 Sep 2021 09:43:15 +0200
-Subject: [PATCH] mu: 1.6.5 -> 1.6.6
-
----
- 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 db8f9bdb9d1a52..4b9efdc24a6011 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 = "1.6.5";
-+  version = "1.6.6";
- 
-   src = fetchFromGitHub {
-     owner  = "djcb";
-     repo   = "mu";
-     rev    = version;
--    sha256 = "ZHEUJiEJzQzSwWgY07dDflY5GRiD1We435htY/7IOdQ=";
-+    sha256 = "64TfXPz1NCGKnozI9j+yog+hln1rA/qpzCLvPNSvH+c=";
-   };
- 
-   postPatch = lib.optionalString (batchSize != null) ''