diff --git a/package.json b/package.json
index 3d40f6f..3dae837 100644
--- a/package.json
+++ b/package.json
@@ -36,13 +36,13 @@
     "@fastify/swagger-ui": "^5.2.5",
     "@fastify/type-provider-typebox": "^6.1.0",
     "@scalar/fastify-api-reference": "^1.44.15",
-    "@sinclair/typebox": "^0.34.48",
     "fastify": "^5.7.4",
     "fastify-cli": "^7.4.1",
     "fastify-plugin": "^5.1.0",
     "jsonwebtoken": "^9.0.3",
     "jwks-rsa": "^3.2.2",
-    "openid-client": "^6.8.2"
+    "openid-client": "^6.8.2",
+    "typebox": "^1.0.81"
   },
   "devDependencies": {
     "@commitlint/cli": "^20.4.1",
diff --git a/src/plugins/auth.ts b/src/plugins/auth.ts
index 0426607..4a3f129 100644
--- a/src/plugins/auth.ts
+++ b/src/plugins/auth.ts
@@ -1,12 +1,12 @@
 import { ResponseSchema } from "../utils/schema.js";
 import { UnionOneOf } from "../utils/typebox/union-oneof.js";
-import { Type } from "@sinclair/typebox";
 import { FastifyReply, FastifyRequest } from "fastify";
 import fp from "fastify-plugin";
 import jwt, { JwtHeader, SigningKeyCallback } from "jsonwebtoken";
 import { JwksClient } from "jwks-rsa";
 import * as client from "openid-client";
 import { skipSubjectCheck, WWWAuthenticateChallengeError } from "openid-client";
+import { Type } from "typebox";
 
 export interface AuthPluginOptions {
   /** The discovery URL of the OpenID Connect provider. */
diff --git a/src/plugins/sensible.ts b/src/plugins/sensible.ts
index 7a56c0b..d93c0fa 100644
--- a/src/plugins/sensible.ts
+++ b/src/plugins/sensible.ts
@@ -1,6 +1,6 @@
 import sensible from "@fastify/sensible";
-import { Type } from "@sinclair/typebox";
 import fp from "fastify-plugin";
+import { Type } from "typebox";
 
 export const HttpError = Type.Ref("HttpError");
 
diff --git a/src/routes/auth-example/index.ts b/src/routes/auth-example/index.ts
index 40ea073..2dc6144 100644
--- a/src/routes/auth-example/index.ts
+++ b/src/routes/auth-example/index.ts
@@ -1,8 +1,8 @@
 import { FastifyTypebox } from "../../app.js";
 import { AuthResponseSchema } from "../../plugins/auth.js";
 import { mergeResponse } from "../../utils/schema.js";
-import { Type } from "@sinclair/typebox";
 import { FastifyPluginAsync } from "fastify";
+import { Type } from "typebox";
 
 const authExample: FastifyPluginAsync = async (
   fastify: FastifyTypebox,
diff --git a/src/routes/example/index.ts b/src/routes/example/index.ts
index 712857d..3fd4d48 100644
--- a/src/routes/example/index.ts
+++ b/src/routes/example/index.ts
@@ -1,7 +1,7 @@
 import { FastifyTypebox } from "../../app.js";
 import { HttpError } from "../../plugins/sensible.js";
-import { Type } from "@sinclair/typebox";
 import { FastifyPluginAsync } from "fastify";
+import { Type } from "typebox";
 
 const example: FastifyPluginAsync = async (
   fastify: FastifyTypebox,
diff --git a/src/routes/root.ts b/src/routes/root.ts
index ede5840..68dc6f3 100644
--- a/src/routes/root.ts
+++ b/src/routes/root.ts
@@ -1,6 +1,6 @@
 import { FastifyTypebox } from "../app.js";
-import { Type } from "@sinclair/typebox";
 import { FastifyPluginAsync } from "fastify";
+import { Type } from "typebox";
 
 const root: FastifyPluginAsync = async (
   fastify: FastifyTypebox,
diff --git a/src/utils/schema.ts b/src/utils/schema.ts
index 1356a19..4e1df39 100644
--- a/src/utils/schema.ts
+++ b/src/utils/schema.ts
@@ -1,5 +1,5 @@
 import { UnionOneOf } from "./typebox/union-oneof.js";
-import { TSchema } from "@sinclair/typebox";
+import { TSchema } from "typebox";
 
 export type ResponseSchema = Record<number, TSchema>;
 
diff --git a/src/utils/typebox/union-oneof.ts b/src/utils/typebox/union-oneof.ts
index ebf9ba0..5c0fce0 100644
--- a/src/utils/typebox/union-oneof.ts
+++ b/src/utils/typebox/union-oneof.ts
@@ -2,7 +2,7 @@
 
 /*--------------------------------------------------------------------------
 
-@sinclair/typebox/prototypes
+typebox/prototypes
 
 The MIT License (MIT)
 
@@ -28,25 +28,27 @@ THE SOFTWARE.
 
 ---------------------------------------------------------------------------*/
 
-import { TypeRegistry, Kind, Static, TSchema, SchemaOptions } from '@sinclair/typebox'
-import { Value } from '@sinclair/typebox/value'
+import { TSchema, TSchemaOptions, Static } from 'typebox'
 
 // -------------------------------------------------------------------------------------
 // TUnionOneOf
 // -------------------------------------------------------------------------------------
 export interface TUnionOneOf<T extends TSchema[]> extends TSchema {
-  [Kind]: 'UnionOneOf'
+  '~kind': 'UnionOneOf'
   static: { [K in keyof T]: Static<T[K]> }[number]
   oneOf: T
 }
 // -------------------------------------------------------------------------------------
 // UnionOneOf
 // -------------------------------------------------------------------------------------
-/** `[Experimental]` Creates a Union type with a `oneOf` schema representation */
-export function UnionOneOf<T extends TSchema[]>(oneOf: [...T], options: SchemaOptions = {}) {
-  function UnionOneOfCheck(schema: TUnionOneOf<TSchema[]>, value: unknown) {
-    return 1 === schema.oneOf.reduce((acc: number, schema: any) => (Value.Check(schema, value) ? acc + 1 : acc), 0)
-  }
-  if (!TypeRegistry.Has('UnionOneOf')) TypeRegistry.Set('UnionOneOf', UnionOneOfCheck)
-  return { ...options, [Kind]: 'UnionOneOf', oneOf } as TUnionOneOf<T>
+/** 
+ * `[Experimental]` Creates a Union type with a `oneOf` schema representation 
+ * 
+ * Note: Runtime validation of oneOf is handled by the JSON Schema validator (e.g., Ajv)
+ * which is used by Fastify. The oneOf keyword is a standard JSON Schema keyword that
+ * ensures exactly one of the schemas matches. This implementation doesn't need custom
+ * validation logic as the standard validator handles it.
+ */
+export function UnionOneOf<T extends TSchema[]>(oneOf: [...T], options: TSchemaOptions = {}) {
+  return { ...options, '~kind': 'UnionOneOf', oneOf } as TUnionOneOf<T>
 }
diff --git a/yarn.lock b/yarn.lock
index b4a4479..11640fe 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -789,13 +789,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@sinclair/typebox@npm:^0.34.48":
-  version: 0.34.48
-  resolution: "@sinclair/typebox@npm:0.34.48"
-  checksum: 10c0/e09f26d8ad471a07ee64004eea7c4ec185349a1f61c03e87e71ea33cbe98e97959940076c2e52968a955ffd4c215bf5ba7035e77079511aac7935f25e989e29d
-  languageName: node
-  linkType: hard
-
 "@trivago/prettier-plugin-sort-imports@npm:^6.0.2":
   version: 6.0.2
   resolution: "@trivago/prettier-plugin-sort-imports@npm:6.0.2"
@@ -3830,7 +3823,6 @@ __metadata:
     "@fastify/swagger-ui": "npm:^5.2.5"
     "@fastify/type-provider-typebox": "npm:^6.1.0"
     "@scalar/fastify-api-reference": "npm:^1.44.15"
-    "@sinclair/typebox": "npm:^0.34.48"
     "@trivago/prettier-plugin-sort-imports": "npm:^6.0.2"
     "@types/jsonwebtoken": "npm:^9.0.10"
     "@types/node": "npm:^25.2.2"
@@ -3849,6 +3841,7 @@ __metadata:
     openid-client: "npm:^6.8.2"
     prettier: "npm:^3.8.1"
     prettier-plugin-jsdoc: "npm:^1.8.0"
+    typebox: "npm:^1.0.81"
     typescript: "npm:^5.9.3"
     typescript-eslint: "npm:^8.54.0"
   languageName: unknown
@@ -3964,6 +3957,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typebox@npm:^1.0.81":
+  version: 1.0.81
+  resolution: "typebox@npm:1.0.81"
+  checksum: 10c0/0944c5a5214a8c218d345dbba30de8384fd00fc6ab6c948e67661e8647c42f04530401f8e6238a556860bb1dbcdf1b300407219c66aac237c6ccaeed22d2460c
+  languageName: node
+  linkType: hard
+
 "typescript-eslint@npm:^8.54.0":
   version: 8.54.0
   resolution: "typescript-eslint@npm:8.54.0"