diff --git a/.github/workflows/cd-cdk.yaml b/.github/workflows/cd-cdk.yaml
index f443af2..5ed6726 100644
--- a/.github/workflows/cd-cdk.yaml
+++ b/.github/workflows/cd-cdk.yaml
@@ -77,6 +77,9 @@ jobs:
           python-version: ${{ inputs.python-version }}
 
       - name: Install Node dependencies
+        # Only when a lockfile exists (TS CDK repos). Python CDK repos have no
+        # package.json and use `npx -y cdk`, so skip rather than fail npm ci.
+        if: ${{ hashFiles(format('{0}/package-lock.json', inputs.cdk-dir)) != '' }}
         working-directory: ${{ inputs.cdk-dir }}
         run: npm ci