diff --git a/.github/workflows/test-nix.yml b/.github/workflows/test-nix.yml
index 8afc474..d45ab2b 100644
--- a/.github/workflows/test-nix.yml
+++ b/.github/workflows/test-nix.yml
@@ -27,8 +27,8 @@ jobs:
           CACHIX_AUTH_TOKEN: "${{ secrets.CACHIX_TOKEN_HOLOCHAIN_OPEN_DEV }}"
         run: |
           cd ./nix/fixtures/module-repo
-          nix build -L .#my_zome
-          cachix push holochain-open-dev $(nix path-info .#my_zome)
+          nix flake update
+          cachix watch-exec holochain-open-dev -- nix build -L .#my_zome
           sha256sum result
 
   macos-just-get-from-cache:
@@ -56,6 +56,7 @@ jobs:
       - name: Build zomes
         run: |
           cd ./nix/fixtures/module-repo
+          nix flake update
           nix build -L .#my_zome
           sha256sum result