diff --git a/nix/london/configuration.nix b/nix/london/configuration.nix
index a8442bb..dfc0e23 100644
--- a/nix/london/configuration.nix
+++ b/nix/london/configuration.nix
@@ -71,6 +71,7 @@
   i18n.defaultLocale = "en_GB.utf8";
 
   services = {
+    fwupd.enable = true;
     syncthing = {
       enable = true;
       overrideDevices = false;
diff --git a/nix/london/gsimmer.nix b/nix/london/gsimmer.nix
index 90aa1e0..39b9aee 100644
--- a/nix/london/gsimmer.nix
+++ b/nix/london/gsimmer.nix
@@ -16,7 +16,7 @@
         [
           (import (builtins.fetchTarball {
             url = "https://github.com/nix-community/emacs-overlay/archive/master.tar.gz";
-            sha256 = "17y4i3p35qbw4xq7fybs60d2ym3brqzpv9mgsb55ma1rfc08m1jc";
+            sha256 = "1jn0gw1a0dffvqizy15yni6qnsr94k48zl7b2vqfvfr409nxsyaw";
           })) discordOverlay];
   };
   home = {