diff --git a/.github/actions/install-nix-action/action.yaml b/.github/actions/install-nix-action/action.yaml
index 28103f589..c0c039e3f 100644
--- a/.github/actions/install-nix-action/action.yaml
+++ b/.github/actions/install-nix-action/action.yaml
@@ -9,7 +9,7 @@ inputs:
   install_url:
     description: "URL of the Nix installer"
     required: false
-    default: "https://releases.nixos.org/nix/nix-2.30.1/install"
+    default: "https://releases.nixos.org/nix/nix-2.29.1/install"
   github_token:
     description: "Github token"
     required: true
@@ -19,7 +19,7 @@ runs:
     - name: "Download nix install artifact from master"
       shell: bash
       id: download-nix-installer
-      if: ${{ inputs.dogfood }}
+      if: inputs.dogfood == 'true'
       run: |
         RUN_ID=$(gh run list --repo "$DOGFOOD_REPO" --workflow ci.yml --branch master --status success --json databaseId --jq ".[0].databaseId")
 
@@ -45,6 +45,6 @@ runs:
     - uses: cachix/install-nix-action@c134e4c9e34bac6cab09cf239815f9339aaaf84e # v31.5.1
       with:
         # Ternary operator in GHA: https://www.github.com/actions/runner/issues/409#issuecomment-752775072
-        install_url: ${{ inputs.dogfood && format('{0}/install', steps.download-nix-installer.outputs.installer-path) || inputs.install_url }}
-        install_options: ${{ inputs.dogfood && format('--tarball-url-prefix {0}', steps.download-nix-installer.outputs.installer-path) || '' }}
+        install_url: ${{ inputs.dogfood == 'true' && format('{0}/install', steps.download-nix-installer.outputs.installer-path) || inputs.install_url }}
+        install_options: ${{ inputs.dogfood == 'true' && format('--tarball-url-prefix {0}', steps.download-nix-installer.outputs.installer-path) || '' }}
         extra_nix_config: ${{ inputs.extra_nix_config }}