diff --git a/action.yml b/action.yml
index 642e1c3..809c1d8 100644
--- a/action.yml
+++ b/action.yml
@@ -29,6 +29,9 @@ runs:
       shell: bash
       env:
         INPUT_PROJECTBASEDIR: ${{ inputs.projectBaseDir }}
+    - name: Vulnerability warning
+      shell: bash
+      run: echo "::warning title=Vulnerability warning::This version of the SonarQube Scanner GitHub Action is no longer supported and contains a security vulnerability. Please update your workflow to use sonarsource/sonarqube-scan-action@v6 for the latest security patches and features. For more information visit https://community.sonarsource.com/gha-v6-update"
     - name: Load Sonar Scanner CLI from cache
       id: sonar-scanner-cli
       uses: actions/cache@v4