diff --git a/.github/workflows/check-lock.yml b/.github/workflows/check-lock.yml
index 34de871e..d7812412 100644
--- a/.github/workflows/check-lock.yml
+++ b/.github/workflows/check-lock.yml
@@ -23,8 +23,8 @@ jobs:
         uses: samueldr/lix-gha-installer-action@7b7f14d320d6aacfb65bd1ef761566b3b69e474c # v2026-02-22
         with:
           extra_nix_config: |
-            substituters = https://extersia.cachix.org
-            trusted-public-keys = extersia.cachix.org-1:ZHy9765xrhn4lDKGTzWWykHC+B091oTqNxClgc78MQU=
+            substituters = https://cache.nixos.org/ https://extersia.cachix.org
+            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= extersia.cachix.org-1:ZHy9765xrhn4lDKGTzWWykHC+B091oTqNxClgc78MQU=
 
       - name: Check flake.lock
         run: nix run github:extersia-org/pkgs#locker