diff --git a/drb-c2-core/app/routers/nodes.py b/drb-c2-core/app/routers/nodes.py
index ed9e965..3707366 100644
--- a/drb-c2-core/app/routers/nodes.py
+++ b/drb-c2-core/app/routers/nodes.py
@@ -97,10 +97,40 @@ async def request_node_update(node_id: str, _: dict = Depends(require_admin_toke
     if not node:
         raise HTTPException(404, f"Node '{node_id}' not found.")
     requested_at = datetime.now(timezone.utc).isoformat()
+    mqtt_sent = await _flag_update(node_id, requested_at)
+    return {"ok": True, "update_requested_at": requested_at, "mqtt_sent": mqtt_sent}
+
+
+async def _flag_update(node_id: str, requested_at: str) -> bool:
     await fstore.doc_update("nodes", node_id, {"update_requested_at": requested_at})
     mqtt_sent = mqtt_handler.send_command(node_id, {"action": "node_update"})
     logger.info(f"Update requested for {node_id!r} at {requested_at} (mqtt_sent={mqtt_sent})")
-    return {"ok": True, "update_requested_at": requested_at, "mqtt_sent": mqtt_sent}
+    return mqtt_sent
+
+
+@router.post("/request-update-all")
+async def request_update_all_nodes(_: dict = Depends(require_admin_token)):
+    """Fleet-wide "Update Node": the same two-channel request as
+    request_node_update, for every approved node. Pending/rejected nodes are
+    skipped — a rejected node must not be nudged (server-26#195), and a pending
+    one has no key to check in with."""
+    requested_at = datetime.now(timezone.utc).isoformat()
+    nodes = await fstore.collection_list("nodes")
+    requested, mqtt_sent, skipped = [], [], []
+    for n in nodes:
+        nid = n.get("node_id")
+        if not nid:
+            continue
+        if n.get("approval_status") != "approved":
+            skipped.append(nid)
+            continue
+        requested.append(nid)
+        if await _flag_update(nid, requested_at):
+            mqtt_sent.append(nid)
+    logger.info(f"Fleet update requested at {requested_at}: {len(requested)} nodes, "
+                f"{len(mqtt_sent)} via MQTT, {len(skipped)} skipped")
+    return {"ok": True, "update_requested_at": requested_at, "requested": requested,
+            "mqtt_sent": mqtt_sent, "skipped": skipped}
 
 
 @router.delete("/{node_id}", status_code=204)
diff --git a/drb-c2-core/tests/test_node_update_all.py b/drb-c2-core/tests/test_node_update_all.py
new file mode 100644
index 0000000..b16eb09
--- /dev/null
+++ b/drb-c2-core/tests/test_node_update_all.py
@@ -0,0 +1,56 @@
+"""
+POST /nodes/request-update-all — the fleet-wide "Update Node": flags every
+approved node (HTTPS) and nudges it over MQTT; pending/rejected nodes are skipped.
+"""
+from unittest.mock import AsyncMock, MagicMock, patch
+
+from fastapi.testclient import TestClient
+
+from app.main import app
+from app.internal.auth import require_admin_token, require_service_or_firebase_token
+from app.routers import nodes
+
+client = TestClient(app)
+
+
+def setup_function():
+    app.dependency_overrides[require_admin_token] = lambda: {"admin": True}
+    app.dependency_overrides[require_service_or_firebase_token] = lambda: {"admin": True}
+
+
+def teardown_function():
+    app.dependency_overrides.pop(require_admin_token, None)
+    app.dependency_overrides.pop(require_service_or_firebase_token, None)
+
+
+def test_update_all_flags_only_approved_nodes():
+    fleet = [
+        {"node_id": "a", "approval_status": "approved"},
+        {"node_id": "b", "approval_status": "approved"},
+        {"node_id": "p", "approval_status": "pending"},
+        {"node_id": "r", "approval_status": "rejected"},
+    ]
+    doc_update = AsyncMock()
+    send = MagicMock(side_effect=lambda nid, cmd: nid == "a")
+    with patch.object(nodes.fstore, "collection_list", AsyncMock(return_value=fleet)), \
+         patch.object(nodes.fstore, "doc_update", doc_update), \
+         patch.object(nodes.mqtt_handler, "send_command", send):
+        r = client.post("/nodes/request-update-all")
+
+    assert r.status_code == 200
+    body = r.json()
+    assert body["requested"] == ["a", "b"]
+    assert body["mqtt_sent"] == ["a"]
+    assert sorted(body["skipped"]) == ["p", "r"]
+    flagged = {c.args[1] for c in doc_update.await_args_list}
+    assert flagged == {"a", "b"}
+    for c in doc_update.await_args_list:
+        assert c.args[2] == {"update_requested_at": body["update_requested_at"]}
+    assert {c.args[0] for c in send.call_args_list} == {"a", "b"}
+    assert all(c.args[1] == {"action": "node_update"} for c in send.call_args_list)
+
+
+def test_update_all_requires_admin():
+    app.dependency_overrides.pop(require_admin_token, None)
+    r = client.post("/nodes/request-update-all")
+    assert r.status_code in (401, 403)
diff --git a/drb-frontend/app/nodes/page.tsx b/drb-frontend/app/nodes/page.tsx
index 7215834..c72a3d7 100644
--- a/drb-frontend/app/nodes/page.tsx
+++ b/drb-frontend/app/nodes/page.tsx
@@ -7,6 +7,7 @@ import { useSystems } from "@/lib/useSystems";
 import { NodeCard } from "@/components/NodeCard";
 import { NodeConfigModal } from "@/components/NodeConfigModal";
 import { useAuth } from "@/components/AuthProvider";
+import { c2api } from "@/lib/c2api";
 import type { NodeRecord } from "@/lib/types";
 
 export default function NodesPage() {
@@ -20,6 +21,32 @@ export default function NodesPage() {
   }, [authLoading, isAdmin, isOperator, router]);
 
   const [configNode, setConfigNode] = useState<NodeRecord | null>(null);
+  const [updatingAll, setUpdatingAll] = useState(false);
+
+  async function handleUpdateAll() {
+    if (
+      !confirm(
+        "Update every approved node? Each one pulls the latest release it tracks and recreates its " +
+          "containers (radio capture pauses for about a minute per node). Online nodes start within " +
+          "seconds; offline nodes pick it up on their next check-in (up to ~15 minutes).",
+      )
+    )
+      return;
+    setUpdatingAll(true);
+    try {
+      const r = await c2api.requestUpdateAllNodes();
+      const offline = r.requested.filter((n) => !r.mqtt_sent.includes(n));
+      alert(
+        `Update requested for ${r.requested.length} node(s).` +
+          (offline.length ? ` Not reachable over MQTT right now (will update on next check-in): ${offline.join(", ")}.` : "") +
+          (r.skipped.length ? ` Skipped (not approved): ${r.skipped.join(", ")}.` : ""),
+      );
+    } catch (err) {
+      alert(err instanceof Error ? err.message : "Update request failed.");
+    } finally {
+      setUpdatingAll(false);
+    }
+  }
 
   // Every hook must run before this guard. React tracks hooks by call order,
   // so returning early on the first render and then reaching a useState on the
@@ -32,7 +59,18 @@ export default function NodesPage() {
 
   return (
     <div className="space-y-6">
-      <h1 className="text-xl font-bold text-white font-mono">Nodes</h1>
+      <div className="flex items-center justify-between gap-4">
+        <h1 className="text-xl font-bold text-white font-mono">Nodes</h1>
+        {isAdmin && (
+          <button
+            onClick={handleUpdateAll}
+            disabled={updatingAll}
+            className="px-4 py-2 bg-gray-800 hover:bg-gray-700 text-gray-300 rounded-lg text-sm font-mono transition-colors disabled:opacity-50"
+          >
+            {updatingAll ? "Requesting…" : "Update All Nodes"}
+          </button>
+        )}
+      </div>
 
       {pending.length > 0 && (
         <div className="space-y-2">
diff --git a/drb-frontend/lib/c2api.ts b/drb-frontend/lib/c2api.ts
index bfb3067..7b38f5f 100644
--- a/drb-frontend/lib/c2api.ts
+++ b/drb-frontend/lib/c2api.ts
@@ -114,6 +114,12 @@ export const c2api = {
       `/nodes/${id}/request-update`,
       { method: "POST" },
     ),
+  /** Fleet-wide Update Node: every approved node; pending/rejected are skipped. */
+  requestUpdateAllNodes: () =>
+    request<{ ok: boolean; update_requested_at: string; requested: string[]; mqtt_sent: string[]; skipped: string[] }>(
+      `/nodes/request-update-all`,
+      { method: "POST" },
+    ),
   rejectNode: (id: string) =>
     request(`/nodes/${id}/reject`, { method: "POST" }),