diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index d2ae76e..8f933e5 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -36,7 +36,9 @@
           fetch-depth: 0
       - uses: DeterminateSystems/nix-installer-action@main
         with:
+          determinate: false
           extra-conf: |
+            access-tokens = ${{ env.GITHUB_ACCESS_TOKEN_STR }}
             extra-substituters = https://nix-cache.fossi-foundation.org
             extra-trusted-public-keys = nix-cache.fossi-foundation.org:3+K59iFwXqKsL7BNu6Guy0v+uTlwsxYQxjspXzqLYQs=
       - name: Install Magic, Ciel, GHR