diff --git a/.github/workflows/model-eval.yml b/.github/workflows/model-eval.yml
index a1f599c..042ec28 100644
--- a/.github/workflows/model-eval.yml
+++ b/.github/workflows/model-eval.yml
@@ -147,7 +147,7 @@ jobs:
                   lines.append(f"  - {key}: `{metrics[key]}`")
           summary.write_text("\n".join(lines) + "\n", encoding="utf-8")
           PY
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         if: always()
         with:
           name: model-evaluation-report
diff --git a/.github/workflows/quality.yml b/.github/workflows/quality.yml
index 458fdc4..5d4ea63 100644
--- a/.github/workflows/quality.yml
+++ b/.github/workflows/quality.yml
@@ -70,7 +70,7 @@ jobs:
       - run: python -m unittest discover -s tests -q
       - run: python scripts/benchmark_agent.py --tier 2 --gate
       - run: python docs/demo/run_all.py
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         if: always()
         with:
           name: integration-reports
diff --git a/.github/workflows/semantic-weekly.yml b/.github/workflows/semantic-weekly.yml
index a308c2a..1251830 100644
--- a/.github/workflows/semantic-weekly.yml
+++ b/.github/workflows/semantic-weekly.yml
@@ -67,7 +67,7 @@ jobs:
           PY
       - name: Upload semantic audit report
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: semantic-weekly-report
           path: semantic-weekly-report.json