diff --git a/base.nix b/base.nix
index a021db9..6f93591 100644
--- a/base.nix
+++ b/base.nix
@@ -20,4 +20,9 @@
   environment.variables.EDITOR = "vim";
 
   programs.appimage.binfmt = true;
+
+  nix.gc = {
+    automatic = true;
+    options = "--delete-older-than 30d";
+  };
 }