diff --git a/src/examples/server/jsonResponseStreamableHttp.ts b/src/examples/server/jsonResponseStreamableHttp.ts
index 224955c46..552f94e1b 100644
--- a/src/examples/server/jsonResponseStreamableHttp.ts
+++ b/src/examples/server/jsonResponseStreamableHttp.ts
@@ -2,7 +2,7 @@ import { Request, Response } from 'express';
 import { randomUUID } from 'node:crypto';
 import { McpServer } from '../../server/mcp.js';
 import { StreamableHTTPServerTransport } from '../../server/streamableHttp.js';
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 import { CallToolResult, isInitializeRequest } from '../../types.js';
 import { createMcpExpressApp } from '../../server/express.js';
 
diff --git a/src/examples/server/mcpServerOutputSchema.ts b/src/examples/server/mcpServerOutputSchema.ts
index 7ef9f6227..0d15ad989 100644
--- a/src/examples/server/mcpServerOutputSchema.ts
+++ b/src/examples/server/mcpServerOutputSchema.ts
@@ -6,7 +6,7 @@
 
 import { McpServer } from '../../server/mcp.js';
 import { StdioServerTransport } from '../../server/stdio.js';
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 
 const server = new McpServer({
     name: 'mcp-output-schema-high-level-example',
diff --git a/src/examples/server/simpleSseServer.ts b/src/examples/server/simpleSseServer.ts
index 1cd10cd2d..1e7f2b7dc 100644
--- a/src/examples/server/simpleSseServer.ts
+++ b/src/examples/server/simpleSseServer.ts
@@ -1,7 +1,7 @@
 import { Request, Response } from 'express';
 import { McpServer } from '../../server/mcp.js';
 import { SSEServerTransport } from '../../server/sse.js';
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 import { CallToolResult } from '../../types.js';
 import { createMcpExpressApp } from '../../server/express.js';
 
diff --git a/src/examples/server/simpleStatelessStreamableHttp.ts b/src/examples/server/simpleStatelessStreamableHttp.ts
index 748d82fda..0379d2992 100644
--- a/src/examples/server/simpleStatelessStreamableHttp.ts
+++ b/src/examples/server/simpleStatelessStreamableHttp.ts
@@ -1,7 +1,7 @@
 import { Request, Response } from 'express';
 import { McpServer } from '../../server/mcp.js';
 import { StreamableHTTPServerTransport } from '../../server/streamableHttp.js';
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 import { CallToolResult, GetPromptResult, ReadResourceResult } from '../../types.js';
 import { createMcpExpressApp } from '../../server/express.js';
 
diff --git a/src/examples/server/simpleStreamableHttp.ts b/src/examples/server/simpleStreamableHttp.ts
index ca1363198..6b521e244 100644
--- a/src/examples/server/simpleStreamableHttp.ts
+++ b/src/examples/server/simpleStreamableHttp.ts
@@ -1,6 +1,6 @@
 import { Request, Response } from 'express';
 import { randomUUID } from 'node:crypto';
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 import { McpServer } from '../../server/mcp.js';
 import { StreamableHTTPServerTransport } from '../../server/streamableHttp.js';
 import { getOAuthProtectedResourceMetadataUrl, mcpAuthMetadataRouter } from '../../server/auth/router.js';
diff --git a/src/examples/server/sseAndStreamableHttpCompatibleServer.ts b/src/examples/server/sseAndStreamableHttpCompatibleServer.ts
index 5c91b7e33..349e57c02 100644
--- a/src/examples/server/sseAndStreamableHttpCompatibleServer.ts
+++ b/src/examples/server/sseAndStreamableHttpCompatibleServer.ts
@@ -3,7 +3,7 @@ import { randomUUID } from 'node:crypto';
 import { McpServer } from '../../server/mcp.js';
 import { StreamableHTTPServerTransport } from '../../server/streamableHttp.js';
 import { SSEServerTransport } from '../../server/sse.js';
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 import { CallToolResult, isInitializeRequest } from '../../types.js';
 import { InMemoryEventStore } from '../shared/inMemoryEventStore.js';
 import { createMcpExpressApp } from '../../server/express.js';
diff --git a/src/examples/server/toolWithSampleServer.ts b/src/examples/server/toolWithSampleServer.ts
index e6d733598..ef105c5b6 100644
--- a/src/examples/server/toolWithSampleServer.ts
+++ b/src/examples/server/toolWithSampleServer.ts
@@ -2,7 +2,7 @@
 
 import { McpServer } from '../../server/mcp.js';
 import { StdioServerTransport } from '../../server/stdio.js';
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 
 const mcpServer = new McpServer({
     name: 'tools-with-sample-server',
diff --git a/src/server/auth/handlers/authorize.ts b/src/server/auth/handlers/authorize.ts
index dcb6c03ec..a4155e376 100644
--- a/src/server/auth/handlers/authorize.ts
+++ b/src/server/auth/handlers/authorize.ts
@@ -1,5 +1,5 @@
 import { RequestHandler } from 'express';
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 import express from 'express';
 import { OAuthServerProvider } from '../provider.js';
 import { rateLimit, Options as RateLimitOptions } from 'express-rate-limit';
diff --git a/src/server/auth/handlers/token.ts b/src/server/auth/handlers/token.ts
index 4cc4e8ab8..af9f9614d 100644
--- a/src/server/auth/handlers/token.ts
+++ b/src/server/auth/handlers/token.ts
@@ -1,4 +1,4 @@
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 import express, { RequestHandler } from 'express';
 import { OAuthServerProvider } from '../provider.js';
 import cors from 'cors';
diff --git a/src/server/auth/middleware/clientAuth.ts b/src/server/auth/middleware/clientAuth.ts
index 6cc6a1923..ecef12774 100644
--- a/src/server/auth/middleware/clientAuth.ts
+++ b/src/server/auth/middleware/clientAuth.ts
@@ -1,4 +1,4 @@
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 import { RequestHandler } from 'express';
 import { OAuthRegisteredClientsStore } from '../clients.js';
 import { OAuthClientInformationFull } from '../../../shared/auth.js';
diff --git a/src/shared/auth.ts b/src/shared/auth.ts
index c546c8608..cc790d53f 100644
--- a/src/shared/auth.ts
+++ b/src/shared/auth.ts
@@ -1,4 +1,4 @@
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 
 /**
  * Reusable URL validation that disallows javascript: scheme
diff --git a/src/shared/protocol-transport-handling.test.ts b/src/shared/protocol-transport-handling.test.ts
index a2473f7f8..d76c18fe2 100644
--- a/src/shared/protocol-transport-handling.test.ts
+++ b/src/shared/protocol-transport-handling.test.ts
@@ -2,7 +2,7 @@ import { describe, expect, test, beforeEach } from 'vitest';
 import { Protocol } from './protocol.js';
 import { Transport } from './transport.js';
 import { Request, Notification, Result, JSONRPCMessage } from '../types.js';
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 
 // Mock Transport class
 class MockTransport implements Transport {
diff --git a/src/types.ts b/src/types.ts
index 49a1c4b6d..69fa7a773 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,4 +1,4 @@
-import * as z from 'zod/v4';
+import z from 'zod/v4';
 import { AuthInfo } from './server/auth/types.js';
 
 export const LATEST_PROTOCOL_VERSION = '2025-11-25';