diff --git a/.github/workflows/buildtest.yml b/.github/workflows/buildtest.yml
index f290ecc..ef37ac0 100644
--- a/.github/workflows/buildtest.yml
+++ b/.github/workflows/buildtest.yml
@@ -153,7 +153,7 @@ jobs:
     if: github.repository_owner == 'moves-rwth' && always()
     steps:
       - uses: technote-space/workflow-conclusion-action@v3
-      - uses: dawidd6/action-send-mail@v11
+      - uses: dawidd6/action-send-mail@v15
         with:
           server_address: ${{ secrets.STORM_CI_MAIL_SERVER }}
           server_port: 587