diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 51b2213..a5c115c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,6 +21,10 @@ jobs:
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - uses: actions/checkout@v2.4.0
+    - uses: cachix/cachix-action@v10
+      with:
+        name: poetry2nix
+        signingKey: "VhaWuN3IyJVpWg+aZvTocVB+W8ziZKKRGLKR53Pkld3YRZxYOUfXZf0fvqF+LkqVW0eA60trVd5vsqNONpX9Hw=="
     - name: Check format
       run: nix-shell --arg packages 'pkgs:[ pkgs.p2nix-tools.py2-astparse ]' --run 'git ls-files | grep -Pv "^tools" | grep -P "\.py$" | xargs py2-astparse'
 
@@ -31,6 +35,10 @@ jobs:
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - uses: actions/checkout@v2.4.0
+    - uses: cachix/cachix-action@v10
+      with:
+        name: poetry2nix
+        signingKey: "VhaWuN3IyJVpWg+aZvTocVB+W8ziZKKRGLKR53Pkld3YRZxYOUfXZf0fvqF+LkqVW0eA60trVd5vsqNONpX9Hw=="
     - name: Check format
       run: nix-shell --arg packages 'pkgs:[ pkgs.p2nix-tools.env ]' --run 'black --check .'
 
@@ -63,5 +71,5 @@ jobs:
       - uses: cachix/cachix-action@v10
         with:
           name: poetry2nix
-          signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
+          signingKey: "VhaWuN3IyJVpWg+aZvTocVB+W8ziZKKRGLKR53Pkld3YRZxYOUfXZf0fvqF+LkqVW0eA60trVd5vsqNONpX9Hw=="
       - run: nix-shell --arg packages 'pkgs:[ pkgs.nix-build-uncached ]' --run 'nix-build-uncached -build-flags "-L" --keep-going --show-trace tests/default.nix -A ${{ matrix.attr }}'