diff --git a/src/sequentialthinking/__tests__/server-version.test.ts b/src/sequentialthinking/__tests__/server-version.test.ts
new file mode 100644
index 0000000000..c7d7f5cb39
--- /dev/null
+++ b/src/sequentialthinking/__tests__/server-version.test.ts
@@ -0,0 +1,57 @@
+import { describe, it, expect } from 'vitest';
+import { createRequire } from 'node:module';
+import { existsSync } from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath, pathToFileURL } from 'node:url';
+import { Client } from '@modelcontextprotocol/sdk/client/index.js';
+import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';
+import { resolvePackageVersion, SERVER_VERSION } from '../version.js';
+
+const packageJson = createRequire(import.meta.url)('../package.json') as { version: string };
+const packageRoot = path.join(path.dirname(fileURLToPath(import.meta.url)), '..');
+const distVersionPath = path.join(packageRoot, 'dist', 'version.js');
+const distIndexPath = path.join(packageRoot, 'dist', 'index.js');
+
+describe('server version', () => {
+  it('uses package.json version instead of a hardcoded string', () => {
+    expect(SERVER_VERSION).toBe(packageJson.version);
+    expect(resolvePackageVersion()).toBe(packageJson.version);
+    expect(SERVER_VERSION).not.toBe('0.2.0');
+  });
+
+  // CI runs `npm test` before the dedicated build job. `npm ci` usually
+  // materializes dist/ via prepare, but that is not guaranteed (e.g. local
+  // `rm -rf dist && npm test`, or install with --ignore-scripts).
+  it.skipIf(!existsSync(distVersionPath))(
+    'resolves package.json from the dist layout after build',
+    async () => {
+      const distModule = (await import(pathToFileURL(distVersionPath).href)) as {
+        SERVER_VERSION: string;
+      };
+      expect(distModule.SERVER_VERSION).toBe(packageJson.version);
+    },
+  );
+
+  it.skipIf(!existsSync(distIndexPath))(
+    'stdio initialize reports package.json version in serverInfo',
+    async () => {
+      const transport = new StdioClientTransport({
+        command: process.execPath,
+        args: [distIndexPath],
+        cwd: packageRoot,
+        stderr: 'pipe',
+      });
+      const client = new Client({ name: 'version-smoke', version: '0.0.0' });
+
+      try {
+        await client.connect(transport);
+        const serverInfo = client.getServerVersion();
+        expect(serverInfo?.name).toBe('sequential-thinking-server');
+        expect(serverInfo?.version).toBe(packageJson.version);
+        expect(serverInfo?.version).not.toBe('0.2.0');
+      } finally {
+        await client.close();
+      }
+    },
+  );
+});
diff --git a/src/sequentialthinking/index.ts b/src/sequentialthinking/index.ts
index 217845bb3d..54c42df199 100644
--- a/src/sequentialthinking/index.ts
+++ b/src/sequentialthinking/index.ts
@@ -4,6 +4,7 @@ import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
 import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import { z } from "zod";
 import { SequentialThinkingServer } from './lib.js';
+import { SERVER_VERSION } from './version.js';
 
 /** Safe boolean coercion that correctly handles string "false" */
 const coercedBoolean = z.preprocess((val) => {
@@ -17,7 +18,7 @@ const coercedBoolean = z.preprocess((val) => {
 
 const server = new McpServer({
   name: "sequential-thinking-server",
-  version: "0.2.0",
+  version: SERVER_VERSION,
 });
 
 const thinkingServer = new SequentialThinkingServer();
diff --git a/src/sequentialthinking/version.ts b/src/sequentialthinking/version.ts
new file mode 100644
index 0000000000..1ab7d8f2fd
--- /dev/null
+++ b/src/sequentialthinking/version.ts
@@ -0,0 +1,33 @@
+import { createRequire } from 'node:module';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+/**
+ * Resolve this package's version from package.json.
+ *
+ * Works both from source (`src/sequentialthinking/`) and from the published
+ * layout (`dist/`), where package.json lives one directory up.
+ */
+export function resolvePackageVersion(): string {
+  const require = createRequire(import.meta.url);
+  const moduleDir = path.dirname(fileURLToPath(import.meta.url));
+  const candidates = [
+    path.join(moduleDir, 'package.json'),
+    path.join(moduleDir, '..', 'package.json'),
+  ];
+
+  for (const candidate of candidates) {
+    try {
+      const pkg = require(candidate) as { version?: string };
+      if (pkg.version) {
+        return pkg.version;
+      }
+    } catch {
+      // Try the next candidate when running from dist/ or source.
+    }
+  }
+
+  throw new Error('Could not locate package.json for server version');
+}
+
+export const SERVER_VERSION = resolvePackageVersion();