diff --git a/rebuild-nix-system.sh b/rebuild-nix-system.sh
index 5a5bd98..3b99b19 100755
--- a/rebuild-nix-system.sh
+++ b/rebuild-nix-system.sh
@@ -6,7 +6,7 @@ nix flake check
 # Rebuild the system
 sudo nixos-rebuild switch --flake ./#default
 
-# Clean up old generations older than 90 days
-sudo nix-collect-garbage --delete-older-than 90d 
+# Clean up old generations older than 180 days
+sudo nix-collect-garbage --delete-older-than 180d