diff --git a/flake.lock b/flake.lock
index 52869ed..3c724cd 100644
--- a/flake.lock
+++ b/flake.lock
@@ -73,16 +73,17 @@
         ]
       },
       "locked": {
-        "lastModified": 1653885703,
-        "narHash": "sha256-4GMn8SQRPUM2bMNeCDYEN4Ur0Bfob18QXwuQMGOdhAk=",
+        "lastModified": 1653236640,
+        "narHash": "sha256-Bcfp3mXCT4rLGH8QFu21SAoOG0zb4CEIH4RI1w1m290=",
         "owner": "nix-community",
         "repo": "emacs-overlay",
-        "rev": "140928a84b535f0566f9fc881de29012e7e9331c",
+        "rev": "6dadf0d6dd983d4fcb5c688e98340e1441a0a74d",
         "type": "github"
       },
       "original": {
         "owner": "nix-community",
         "repo": "emacs-overlay",
+        "rev": "6dadf0d6dd983d4fcb5c688e98340e1441a0a74d",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 626eafb..4cf74d3 100644
--- a/flake.nix
+++ b/flake.nix
@@ -27,7 +27,7 @@
     };
 
     emacs-overlay = {
-      url = "github:nix-community/emacs-overlay";
+      url = "github:nix-community/emacs-overlay?rev=6dadf0d6dd983d4fcb5c688e98340e1441a0a74d";
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
diff --git a/machines/stel-xps/software.nix b/machines/stel-xps/software.nix
index bb007c4..396a74e 100644
--- a/machines/stel-xps/software.nix
+++ b/machines/stel-xps/software.nix
@@ -3,6 +3,7 @@
   environment.systemPackages = with pkgs; [
     brightnessctl
     element-desktop
+    signal-desktop
     teams
     zoom-us
   ];