diff --git a/.gitea/workflows/flake-update.yaml b/.gitea/workflows/flake-update.yaml
index a22e06f..3c73533 100644
--- a/.gitea/workflows/flake-update.yaml
+++ b/.gitea/workflows/flake-update.yaml
@@ -11,7 +11,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: DeterminateSystems/nix-installer-action@main
+      - name: Install Nix
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install linux --no-confirm
+          echo "/nix/var/nix/profiles/default/bin" >> "$GITHUB_PATH"
 
       - name: Update flake inputs
         run: nix flake update