diff --git a/.github/workflows/agents-autofix-loop.yml b/.github/workflows/agents-autofix-loop.yml
index 23a34327..e24cc312 100644
--- a/.github/workflows/agents-autofix-loop.yml
+++ b/.github/workflows/agents-autofix-loop.yml
@@ -492,7 +492,7 @@ jobs:
           PY
 
       - name: Upload metrics artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: agents-autofix-metrics
           path: autofix-metrics.ndjson
diff --git a/.github/workflows/agents-keepalive-loop.yml b/.github/workflows/agents-keepalive-loop.yml
index 6dcebe88..e63c93ea 100644
--- a/.github/workflows/agents-keepalive-loop.yml
+++ b/.github/workflows/agents-keepalive-loop.yml
@@ -419,7 +419,7 @@ jobs:
           echo "$metrics_json" >> keepalive-metrics.ndjson
 
       - name: Upload keepalive metrics artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: keepalive-metrics
           path: keepalive-metrics.ndjson
diff --git a/.github/workflows/maint-coverage-guard.yml b/.github/workflows/maint-coverage-guard.yml
index bb033bc0..a993ec03 100644
--- a/.github/workflows/maint-coverage-guard.yml
+++ b/.github/workflows/maint-coverage-guard.yml
@@ -79,7 +79,7 @@ jobs:
 
       - name: Download coverage trend artifact
         if: ${{ steps.discover.outputs.run_id }}
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         continue-on-error: true
         with:
           name: gate-coverage-trend
@@ -89,7 +89,7 @@ jobs:
 
       - name: Download coverage artifact
         if: ${{ steps.discover.outputs.run_id }}
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         continue-on-error: true
         with:
           pattern: gate-coverage-*