diff --git a/modules/base/system.nix b/modules/base/system.nix
index 245db95..3fc10fb 100644
--- a/modules/base/system.nix
+++ b/modules/base/system.nix
@@ -8,7 +8,7 @@
     gc = {
       automatic = true;
       dates = "weekly";
-      options = "--delete-older-than=30d";
+      options = "--delete-older-than=90d";
     };
     settings = {
       auto-optimise-store = true;