diff --git a/.builds/freun-dev.yml b/.builds/freun-dev.yml
index 9cbba44..7550470 100644
--- a/.builds/freun-dev.yml
+++ b/.builds/freun-dev.yml
@@ -1,9 +1,14 @@
 image: nixos/unstable
+secrets:
+  - b6e73fc2-2ca4-4bb5-a3e6-6b868276e0ec
 environment:
   NIX_CONFIG: |
     experimental-features = nix-command flakes
-    extra-platforms = aarch64
+    builders = ssh://builder@freun.dev aarch64-linux /home/build/.ssh/b6e73fc2-2ca4-4bb5-a3e6-6b868276e0ec 8 - - - c3NoLWVkMjU1MTkgQUFBQUMzTnphQzFsWkRJMU5URTVBQUFBSUV2Q1NqSWppcG9nMVhmOW1QYzY4M3I1VlNHU2pWYzh2MVVaZzVWcmJieE0gcm9vdEBmcmV1bi1kZXYK
+    builders-use-substitutes = true
+
 tasks:
   - build: |
+      ls -la ~/.ssh
       cd NixOS
       nix build --dry-run '.#nixosConfigurations.freun-dev.config.system.build.toplevel'