diff --git a/.github/workflows/docker-hub.yml b/.github/workflows/docker-hub.yml
index 935742d1..9321a1ee 100644
--- a/.github/workflows/docker-hub.yml
+++ b/.github/workflows/docker-hub.yml
@@ -134,5 +134,5 @@ jobs:
         name: Call argocd github webhook
         run: |
           data='{"ref": "'$GITHUB_REF'","repository": {"html_url":"'$GITHUB_SERVER_URL'/${{ secrets.DEPLOYMENT_REPO_URL }}"}}'
-          sig=$(echo -n ${data} | openssl dgst -sha1 -hmac "${{ secrets.ARGOCD_PREPROD_WEBHOOK_SECRET }}" | awk '{print "X-Hub-Signature: sha1="$2}')
+          sig=$(echo -n ${data} | openssl dgst -sha256 -hmac "${{ secrets.ARGOCD_PREPROD_WEBHOOK_SECRET }}" | awk '{print "X-Hub-Signature-256: sha256="$2}')
           curl -X POST -H 'X-GitHub-Event:push' -H "Content-Type: application/json" -H "${sig}" --data "${data}" ${{ vars.ARGOCD_PREPROD_WEBHOOK_URL }}
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