diff --git a/flake.lock b/flake.lock
index 39a7c250..99ed718e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -42,11 +42,11 @@
     },
     "emacs-overlay": {
       "locked": {
-        "lastModified": 1627374720,
-        "narHash": "sha256-c5LpdjbhA+7mz2JDs8ObrMV38pydAavpMCE6qCG3ktY=",
+        "lastModified": 1627407312,
+        "narHash": "sha256-gb6LEEa4adXR5pzuj1vU/x/Vc1DH2S4ZjrcsWA/Xp8s=",
         "owner": "nix-community",
         "repo": "emacs-overlay",
-        "rev": "fafc66d018902666d53f20d1a04e1a824cdfcbb0",
+        "rev": "054abca26f9cf416701c880792b564019d528566",
         "type": "github"
       },
       "original": {
@@ -77,11 +77,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1627312560,
-        "narHash": "sha256-h2mpDJIu/rd4nZX4i5U1AFA/3MGXrmFRFy04FDxnvhE=",
+        "lastModified": 1627422633,
+        "narHash": "sha256-9UvA3wn0xap6WLjhE7+90JwCD+PNj630qt721XRC3TQ=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "f6f6990fc811454cb3082ba3662b711488fd0554",
+        "rev": "ae8cb242f2e450c525274732af58b3050399f5bd",
         "type": "github"
       },
       "original": {
@@ -92,11 +92,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1627128856,
-        "narHash": "sha256-yw3lA8zyNFhj309lmxvNByEEymRT1rRy5oE+jEPnsP4=",
+        "lastModified": 1627391865,
+        "narHash": "sha256-tPoWBO9Nzu3wuX37WcnctzL6LoDCErJLnfLGqqmXCm4=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "dd14e5d78e90a2ccd6007e569820de9b4861a6c2",
+        "rev": "8ecc61c91a596df7d3293603a9c2384190c1b89a",
         "type": "github"
       },
       "original": {
diff --git a/modules/base/emacs/default.nix b/modules/base/emacs/default.nix
index 195bd825..f1b6e333 100644
--- a/modules/base/emacs/default.nix
+++ b/modules/base/emacs/default.nix
@@ -25,19 +25,6 @@
   };
 
   config = {
-    nixpkgs.overlays = [
-      (self: super: {
-        mu = super.mu.overrideAttrs (old: {
-          version = "1.5.13";
-          src = self.fetchFromGitHub {
-            owner = "djcb";
-            repo = "mu";
-            rev = "6d67e146fecb5aa512a7eff4b8044225af0dc5ce";
-            sha256 = "0ip7nd7z2l60a3dc1aic34hpab4alb0rmxlk9778nz3v88735iik";
-          };
-        });
-      })
-    ];
     chvp.base.zfs.homeLinks = [
       { path = ".emacs.d"; type = "cache"; }
     ];
diff --git a/patches/131745.patch b/patches/131745.patch
new file mode 100644
index 00000000..f80db615
--- /dev/null
+++ b/patches/131745.patch
@@ -0,0 +1,29 @@
+From 2d1dbaa617424f17f8daa7ec4a25ab3489afdd95 Mon Sep 17 00:00:00 2001
+From: Charlotte Van Petegem <charlotte@vanpetegem.me>
+Date: Wed, 28 Jul 2021 00:58:59 +0200
+Subject: [PATCH] mu: 1.4.15 -> 1.6.0
+
+---
+ 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 4553063929fdf7..da7ef58f199442 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 = "1.4.15";
++  version = "1.6.0";
+ 
+   src = fetchFromGitHub {
+     owner  = "djcb";
+     repo   = "mu";
+     rev    = version;
+-    sha256 = "sha256-VIUA0W+AmEbvGWatv4maBGILvUTGhBgO3iQtjIc3vG8=";
++    sha256 = "d2REyoSbznMhqV4PNntvg8uQmU66Bsi4OwH2Gj7gQ10=";
+   };
+ 
+   postPatch = lib.optionalString (batchSize != null) ''