diff --git a/.changeset/rich-birds-raise.md b/.changeset/rich-birds-raise.md
new file mode 100644
index 00000000..eb832c19
--- /dev/null
+++ b/.changeset/rich-birds-raise.md
@@ -0,0 +1,5 @@
+---
+'@hono/zod-openapi': patch
+---
+
+fix path param format `:id` to `{id}`
diff --git a/packages/zod-openapi/src/index.ts b/packages/zod-openapi/src/index.ts
index 8b2ea78f..3570772a 100644
--- a/packages/zod-openapi/src/index.ts
+++ b/packages/zod-openapi/src/index.ts
@@ -129,6 +129,10 @@ type Hook<T, E extends Env, P extends string, O> = (
   c: Context<E, P>
 ) => TypedResponse<O> | Promise<TypedResponse<T>> | void
 
+type ConvertPathType<T extends string> = T extends `${infer _}/{${infer Param}}${infer _}`
+  ? `/:${Param}`
+  : T
+
 export class OpenAPIHono<E extends Env = Env, S = {}, BasePath extends string = '/'> extends Hono<
   E,
   S,
@@ -143,12 +147,13 @@ export class OpenAPIHono<E extends Env = Env, S = {}, BasePath extends string =
 
   openapi = <
     R extends RouteConfig,
-    I extends Input = InputTypeParam<R> & InputTypeQuery<R> & InputTypeForm<R> & InputTypeJson<R>
+    I extends Input = InputTypeParam<R> & InputTypeQuery<R> & InputTypeForm<R> & InputTypeJson<R>,
+    P extends string = ConvertPathType<R['path']>
   >(
     route: R,
-    handler: Handler<E, R['path'], I, OutputType<R>>,
-    hook?: Hook<I, E, R['path'], OutputType<R>>
-  ): Hono<E, Schema<R['method'], R['path'], I['in'], OutputType<R>>, BasePath> => {
+    handler: Handler<E, P, I, OutputType<R>>,
+    hook?: Hook<I, E, P, OutputType<R>>
+  ): Hono<E, Schema<R['method'], P, I['in'], OutputType<R>>, BasePath> => {
     this.#registry.registerPath(route)
 
     const validators: MiddlewareHandler[] = []
@@ -187,7 +192,7 @@ export class OpenAPIHono<E extends Env = Env, S = {}, BasePath extends string =
       }
     }
 
-    this.on([route.method], route.path, ...validators, handler)
+    this.on([route.method], route.path.replace(/\/{(.+)}/, '/:$1'), ...validators, handler)
     return this
   }
 
diff --git a/packages/zod-openapi/test/index.test.ts b/packages/zod-openapi/test/index.test.ts
index f56beb91..b3c0539f 100644
--- a/packages/zod-openapi/test/index.test.ts
+++ b/packages/zod-openapi/test/index.test.ts
@@ -22,8 +22,8 @@ describe('Basic - params', () => {
 
   const UserSchema = z
     .object({
-      id: z.number().openapi({
-        example: 123,
+      id: z.string().openapi({
+        example: '123',
       }),
       name: z.string().openapi({
         example: 'John Doe',
@@ -44,7 +44,7 @@ describe('Basic - params', () => {
 
   const route = createRoute({
     method: 'get',
-    path: '/users/:id',
+    path: '/users/{id}',
     request: {
       params: ParamsSchema,
     },
@@ -75,7 +75,7 @@ describe('Basic - params', () => {
     (c) => {
       const { id } = c.req.valid('param')
       return c.jsonT({
-        id: Number(id),
+        id,
         age: 20,
         name: 'Ultra-man',
       })
@@ -105,7 +105,7 @@ describe('Basic - params', () => {
     const res = await app.request('/users/123')
     expect(res.status).toBe(200)
     expect(await res.json()).toEqual({
-      id: 123,
+      id: '123',
       age: 20,
       name: 'Ultra-man',
     })
@@ -128,7 +128,7 @@ describe('Basic - params', () => {
           User: {
             type: 'object',
             properties: {
-              id: { type: 'number', example: 123 },
+              id: { type: 'string', example: '123' },
               name: { type: 'string', example: 'John Doe' },
               age: { type: 'number', example: 42 },
             },
@@ -143,7 +143,7 @@ describe('Basic - params', () => {
         parameters: {},
       },
       paths: {
-        '/users/:id': {
+        '/users/{id}': {
           get: {
             parameters: [
               {