diff --git a/.github/workflows/nightly-harness-signals.yml b/.github/workflows/nightly-harness-signals.yml
index 3e0dd72..55bb951 100644
--- a/.github/workflows/nightly-harness-signals.yml
+++ b/.github/workflows/nightly-harness-signals.yml
@@ -96,7 +96,7 @@ jobs:
 
       - name: Upload harness outputs
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: nightly-harness-signals-${{ github.run_id }}
           if-no-files-found: warn
@@ -108,7 +108,7 @@ jobs:
 
       - name: Upload harness logs (on failure)
         if: failure()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: nightly-harness-signals-${{ github.run_id }}-logs
           if-no-files-found: warn
diff --git a/.github/workflows/quality.yml b/.github/workflows/quality.yml
index a132689..dd2784a 100644
--- a/.github/workflows/quality.yml
+++ b/.github/workflows/quality.yml
@@ -109,7 +109,7 @@ jobs:
 
       - name: Upload trace gate report
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: trace_gate_report
           path: trace_gate.report.json