diff --git a/home/common/default.nix b/home/common/default.nix
index e615050..64f8148 100644
--- a/home/common/default.nix
+++ b/home/common/default.nix
@@ -53,5 +53,9 @@
       experimental-features = ["nix-command" "flakes"];
       warn-dirty = false;
     };
+    gc = {
+      automatic = true;
+      options = "--delete-older-than 30d";
+    };
   };
 }