diff --git a/modules/periodic.nix b/modules/periodic.nix
index c54ed44..54484c7 100644
--- a/modules/periodic.nix
+++ b/modules/periodic.nix
@@ -77,4 +77,15 @@ in {
     };
     after = [ "network.target" ];
   };
+
+  # Garbage collect git repositories on a monthly basis
+  systemd.user.services.git-gc = {
+    description = "Garbage collect git repositories";
+    path = [ git fd ];
+    script = ''
+      ${pkgs.fd}/bin/fd -g -H --type directory '.git' /home/coolneng --exec  git -C '{}' gc --aggressive
+    '';
+    serviceConfig.Type = "oneshot";
+    startAt = "*-*-13 17:00:00";
+  };
 }