diff --git a/.forgejo/workflows/deploy-dgnum.yaml b/.forgejo/workflows/deploy-dgnum.yaml
index 0d99678..3c8a68c 100644
--- a/.forgejo/workflows/deploy-dgnum.yaml
+++ b/.forgejo/workflows/deploy-dgnum.yaml
@@ -17,7 +17,10 @@ jobs:
 
       - name: Build website
         run: |
-          cd dgnum.eu && nix --extra-experimental-features nix-command build
+          cd dgnum.eu
+          nix --extra-experimental-features nix-command \
+              --extra-experimental-features flakes \
+              build
 
       - name: Clone dgnum.eu
         uses: actions/checkout@v3