diff --git a/.github/workflows/publish-happ.yaml b/.github/workflows/publish-happ.yaml
index ec88ff51..0a2f4b25 100644
--- a/.github/workflows/publish-happ.yaml
+++ b/.github/workflows/publish-happ.yaml
@@ -20,11 +20,11 @@ jobs:
         uses: ./.github/actions/extend-space
 
       - name: Install nix
-        uses: cachix/install-nix-action@v18
+        uses: cachix/install-nix-action@v20
         with:
           install_url: https://releases.nixos.org/nix/nix-2.23.0/install
 
-      - uses: cachix/cachix-action@v12
+      - uses: cachix/cachix-action@v15
         with:
           name: holochain-ci