diff --git a/.github/workflows/coana-analysis.yml b/.github/workflows/coana-analysis.yml
index 6bf3c3f..90bfa06 100644
--- a/.github/workflows/coana-analysis.yml
+++ b/.github/workflows/coana-analysis.yml
@@ -2,24 +2,27 @@ name: Coana Vulnerability Analysis
 
 on:
   schedule:
-    # every day at 12 AM
-    - cron: "0 0 * * *"
+    - cron: "0 3 * * *" # every day at 3 AM
   workflow_dispatch:
     inputs:
       tags:
         description: "Manually run vulnerability analysis"
+      # Required by the return-dispatch action
+      distinct_id:
 
 jobs:
   coana-vulnerability-analysis:
     runs-on: ubuntu-latest
-    timeout-minutes: 60
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+
       - name: Run Coana CLI
         id: coana-cli
-        run: |
-          npx @coana-tech/cli run . \
-            --api-key ${{ secrets.COANA_API_KEY }} \
-            --repo-url https://github.com/${{github.repository}}
+        uses: docker://coana/coana:latest
+        with:
+          args: |
+            coana run . \
+              --api-key ${{ secrets.COANA_API_KEY }} \
+              --repo-url https://github.com/${{github.repository}}
diff --git a/.github/workflows/coana-guardrail.yml b/.github/workflows/coana-guardrail.yml
index 9850039..6f4139a 100644
--- a/.github/workflows/coana-guardrail.yml
+++ b/.github/workflows/coana-guardrail.yml
@@ -5,19 +5,22 @@ on: pull_request
 jobs:
   guardrail:
     runs-on: ubuntu-latest
-    timeout-minutes: 15
-    steps:
-      - name: Get changed files
-        id: changed-files
-        uses: tj-actions/changed-files@v44
-        with:
-          separator: " "
 
+    steps:
       - name: Checkout the ${{github.base_ref}} branch
         uses: actions/checkout@v4
         with:
           ref: ${{github.base_ref}} # checkout the base branch (usually master/main).
 
+      - name: Fetch the PR branch
+        run: |
+          git fetch origin ${{ github.head_ref }}:${{ github.head_ref }} --depth=1
+
+      - name: Get list of changed files relative to the main/master branch
+        id: changed-files
+        run: |
+          echo "all_changed_files=$(git diff --name-only ${{ github.base_ref }} ${{ github.head_ref }} | tr '\n' ' ')" >> $GITHUB_OUTPUT
+
       - name: Use Node.js 20.x
         uses: actions/setup-node@v4
         with:
@@ -32,7 +35,11 @@ jobs:
             --changed-files ${{ steps.changed-files.outputs.all_changed_files }} \
             --lightweight-reachability \
 
-      # Reset file permissions changed by Coana CLI.
+      # Reset file permissions.
+      # This is necessary because the Coana CLI may add
+      # new files with root ownership since it's using docker.
+      # These files will not be deleted by the clean step in checkout
+      # if the permissions are not reset.
       - name: Reset file permissions
         run: sudo chown -R $USER:$USER .