diff --git a/nix/london/gsimmer.nix b/nix/london/gsimmer.nix
index 8ab6868..3304edb 100644
--- a/nix/london/gsimmer.nix
+++ b/nix/london/gsimmer.nix
@@ -22,7 +22,7 @@
     in [
       (import (builtins.fetchTarball {
         url = "https://github.com/nix-community/emacs-overlay/archive/master.tar.gz";
-        sha256 = "1dqmw3v3w8grqyc492hadxswvj0dfw4w2mbb4nmfcmnanr5i3ys3";
+        sha256 = "0yy91pryh8pbq2sz07nzjb11s5ghrn9773v0vsh475an4g4p9933";
       }))
       discordOverlay
     ];
diff --git a/nix/london/hardware-configuration.nix b/nix/london/hardware-configuration.nix
index e87fb44..cae1739 100644
--- a/nix/london/hardware-configuration.nix
+++ b/nix/london/hardware-configuration.nix
@@ -30,7 +30,7 @@
   fileSystems."/tmp" = {
     device = "tmpfs";
     fsType = "tmpfs";
-    options = [ "size=1G" "mode=777" ]; # mode=755 so only root can write to those files
+    options = [ "size=4G" "mode=777" ]; # mode=755 so only root can write to those files
   };
 
   swapDevices = [