diff --git a/Makefile b/Makefile
index 01241a6..ce06418 100644
--- a/Makefile
+++ b/Makefile
@@ -23,6 +23,10 @@ add-pre-commit-hook:
 	chmod +x .git/hooks/pre-commit
 
 
+.PHONY: cleanup
+cleanup:
+	sudo nix-store --optimise && sudo nix-collect-garbage -d
+
 .PHONY: test
 test:
 	echo "Find nix files"
diff --git a/README.md b/README.md
index b2633ea..f4111b1 100644
--- a/README.md
+++ b/README.md
@@ -149,6 +149,7 @@ cp -r ~/nixos-cesium/config/* /etc/nixos/
 # Remember to activate vm-guest.nix or vm-host.nix in configuration.nix
 
 nix-channel --add https://github.com/nix-community/home-manager/archive/release-25.11.tar.gz home-manager
+nix-channel --add https://nixos.org/channels/nixos-unstable nixos-unstable
 nix-channel --update
 
 # Konfiguration anwenden
diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index 7e2a11b..0a929ef 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -21,5 +21,14 @@
   system.stateVersion = "25.11";
 
   nixpkgs.config.allowUnfree = true;
+  nixpkgs.overlays = [
+    (final: prev: {
+      rustdesk-flutter =
+        let
+          unstable = import <nixos-unstable> { config = prev.config; };
+        in
+        unstable.rustdesk-flutter;
+    })
+  ];
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
 }