diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index f53df30..3fdc083 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -16,6 +16,8 @@ jobs:
       - uses: DeterminateSystems/nix-installer-action@main
         with:
           determinate: true
+          extra-conf: |
+            sandbox = false
       - uses: DeterminateSystems/flakehub-cache-action@main
       - run: nix run nixpkgs#action-validator -- -v ./.github/workflows/workflow.yml
       - run: nix run nixpkgs#nodePackages.prettier -- --check .