diff --git a/README.md b/README.md
index e5e5034..d3a9807 100644
--- a/README.md
+++ b/README.md
@@ -132,6 +132,7 @@ After saving the server, restart the app before testing `who_am_i` or `list_apps
 - `count_devices`
 - `list_issues`
 - `get_issue`
+- `update_issue_status`
 - `get_issue_stats`
 - `get_issue_device_stats`
 - `get_issue_devices`
diff --git a/src/__tests__/client.test.ts b/src/__tests__/client.test.ts
index c2cdb6f..68af6b1 100644
--- a/src/__tests__/client.test.ts
+++ b/src/__tests__/client.test.ts
@@ -55,6 +55,16 @@ describe("BugfenderClient", () => {
       expect(init.method).toBe("POST");
       expect(init.body).toBe(JSON.stringify({ key: "value" }));
     });
+
+    it("makes PUT requests with JSON body", async () => {
+      fetchSpy.mockResolvedValueOnce(jsonResponse({ ok: true }));
+      const client = makeClient();
+      await client.put("/app/app-1/issues-aggregation/hash-1", { status: 3 });
+      const [url, init] = fetchSpy.mock.calls[0];
+      expect(url).toBe("https://api.test/app/app-1/issues-aggregation/hash-1");
+      expect(init.method).toBe("PUT");
+      expect(init.body).toBe(JSON.stringify({ status: 3 }));
+    });
   });
 
   describe("buildHeaders", () => {
diff --git a/src/client.ts b/src/client.ts
index 59437e1..698a452 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -42,6 +42,17 @@ export class BugfenderClient {
     );
   }
 
+  async put<T>(path: string, body?: unknown, requireAuth = true): Promise<T> {
+    return this.request<T>(
+      path,
+      {
+        method: "PUT",
+        body: body ? JSON.stringify(body) : undefined,
+      },
+      requireAuth,
+    );
+  }
+
   private async request<T>(path: string, init: RequestInit, requireAuth: boolean): Promise<T> {
     if (requireAuth && !this.apiToken && !this.refreshToken) {
       throw new BugfenderApiError("Missing Bugfender token", 401, null);
diff --git a/src/tools/issues.ts b/src/tools/issues.ts
index b5edbe9..bcd9b26 100644
--- a/src/tools/issues.ts
+++ b/src/tools/issues.ts
@@ -12,6 +12,30 @@ const issueTypeByName: Record<string, string> = {
   "user feedback": "2",
 };
 
+const issueStatusByName: Record<string, number> = {
+  new: 0,
+  open: 1,
+  in_progress: 2,
+  resolved: 3,
+  closed: 4,
+  muted: 5,
+  invalid: 6,
+};
+
+function normalizeIssueStatus(value: string): number {
+  const trimmed = value.trim().toLowerCase();
+  if (/^\d+$/.test(trimmed)) {
+    return Number(trimmed);
+  }
+
+  const status = issueStatusByName[trimmed];
+  if (status === undefined) {
+    throw new Error(`Invalid issue status: ${value}. Use one of: ${Object.keys(issueStatusByName).join(", ")}`);
+  }
+
+  return status;
+}
+
 function normalizeIssueType(value?: string): string | undefined {
   if (!value) {
     return undefined;
@@ -111,6 +135,25 @@ export function registerIssueTools(server: McpServer, context: ServerContext): v
       ),
   );
 
+  server.tool(
+    "update_issue_status",
+    "Updates the status of an issue group (issues aggregation). Use this to mark issues as resolved, closed, in progress, etc.",
+    {
+      app_id: z.string().describe("The public app ID (e.g. 5X3c4veRGV) from list_apps"),
+      issue_id: z.string().describe("The issue group hash from list_issues or get_issue"),
+      status: z
+        .string()
+        .describe("New status: new, open, in_progress, resolved, closed, muted, or invalid"),
+    },
+    ({ app_id, issue_id, status }) =>
+      handleTool(context, async () => {
+        await context.client.put(`/app/${app_id}/issues-aggregation/${issue_id}`, {
+          status: normalizeIssueStatus(status),
+        });
+        return ok({ app_id, issue_id, status: status.trim().toLowerCase() });
+      }),
+  );
+
   server.tool(
     "get_feedback",
     {