diff --git a/.gitea/workflows/run-agent.yml b/.gitea/workflows/run-agent.yml
index 8a2c4e22..3845b71b 100644
--- a/.gitea/workflows/run-agent.yml
+++ b/.gitea/workflows/run-agent.yml
@@ -111,9 +111,11 @@ jobs:
             --max-runtime="$MAX_RUNTIME_SECONDS" \
             --output-dir=agent_run_output
 
+      # Gitea Actions 는 아티팩트 v3 프로토콜만 지원한다. upload-artifact@v4 는
+      # @actions/artifact v2 API 를 써서 Gitea(GHES 로 식별됨)에서 거부되므로 v3 사용.
       - name: Upload run artifacts
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: agent-run-${{ github.run_number }}
           path: agent_run_output/