diff --git a/configuration.nix b/configuration.nix
index f90017e..23ecef4 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -157,6 +157,12 @@
     binaryCachePublicKeys = [
       "alarsyo.cachix.org-1:A6BmcaJek5+ZDWWv3fPteHhPm6U8liS9CbDbmegPfmk="
     ];
+
+    gc = {
+      automatic = true;
+      dates = "03:15";
+      options = "--delete-older-than 30d";
+    };
   };
 }