diff --git a/src/next/api.ts b/src/next/api.ts
index 29d0daac..60357425 100644
--- a/src/next/api.ts
+++ b/src/next/api.ts
@@ -3,7 +3,7 @@ import {NextApiRequest, NextApiResponse} from 'next';
 import {CustomTokens, VerifiedTokens} from '../auth/custom-token/index.js';
 import {getFirebaseAuth} from '../auth/index.js';
 import {AuthCookies} from './cookies/AuthCookies.js';
-import {SetAuthCookiesOptions} from './cookies/index.js';
+import {CookiesObject, SetAuthCookiesOptions} from './cookies/index.js';
 import {ObjectCookiesProvider} from './cookies/parser/ObjectCookiesProvider.js';
 import {getCookiesTokens} from './tokens.js';
 
@@ -23,9 +23,7 @@ export async function refreshApiResponseCookies(
 }
 
 export async function appendAuthCookiesApi(
-  cookies: Partial<{
-    [key: string]: string;
-  }>,
+  cookies: CookiesObject,
   response: NextApiResponse,
   tokens: CustomTokens,
   options: SetAuthCookiesOptions
@@ -39,9 +37,7 @@ export async function appendAuthCookiesApi(
 }
 
 export async function refreshApiCookies(
-  cookies: Partial<{
-    [key: string]: string;
-  }>,
+  cookies: CookiesObject,
   headers: IncomingHttpHeaders,
   options: SetAuthCookiesOptions
 ): Promise<VerifiedTokens> {
diff --git a/src/next/cookies/index.ts b/src/next/cookies/index.ts
index a62c10d2..100fd1be 100644
--- a/src/next/cookies/index.ts
+++ b/src/next/cookies/index.ts
@@ -178,9 +178,7 @@ export function removeAuthCookies(
 }
 
 export async function verifyApiCookies(
-  cookies: Partial<{
-    [key: string]: string;
-  }>,
+  cookies: CookiesObject,
   headers: IncomingHttpHeaders,
   options: SetAuthCookiesOptions
 ): Promise<VerifiedTokens> {
diff --git a/src/next/cookies/parser/CookieParserFactory.ts b/src/next/cookies/parser/CookieParserFactory.ts
index 909f832c..4649594f 100644
--- a/src/next/cookies/parser/CookieParserFactory.ts
+++ b/src/next/cookies/parser/CookieParserFactory.ts
@@ -3,6 +3,7 @@ import type {RequestCookies} from 'next/dist/server/web/spec-extension/cookies';
 import {InvalidTokenError, InvalidTokenReason} from '../../../auth/error.js';
 import {debug} from '../../../debug/index.js';
 import {GetCookiesTokensOptions} from '../../tokens.js';
+import {CookiesObject} from '../index.js';
 import {CookiesProvider} from './CookiesProvider.js';
 import {MultipleCookiesParser} from './MultipleCookiesParser.js';
 import {ObjectCookiesProvider} from './ObjectCookiesProvider.js';
@@ -105,10 +106,7 @@ export class CookieParserFactory {
     return CookieParserFactory.fromProvider(provider, options);
   }
 
-  static fromObject(
-    cookies: Partial<{[K in string]: string}>,
-    options: GetCookiesTokensOptions
-  ) {
+  static fromObject(cookies: CookiesObject, options: GetCookiesTokensOptions) {
     const provider = new ObjectCookiesProvider(cookies);
 
     return CookieParserFactory.fromProvider(provider, options);
diff --git a/src/next/cookies/parser/ObjectCookiesProvider.ts b/src/next/cookies/parser/ObjectCookiesProvider.ts
index fa76f714..6182f34c 100644
--- a/src/next/cookies/parser/ObjectCookiesProvider.ts
+++ b/src/next/cookies/parser/ObjectCookiesProvider.ts
@@ -1,5 +1,7 @@
+import {CookiesObject} from '../index.js';
+
 export class ObjectCookiesProvider {
-  constructor(private cookies: Partial<{[K in string]: string}>) {}
+  constructor(private cookies: CookiesObject) {}
 
   get(key: string) {
     return this.cookies[key];
diff --git a/src/next/tokens.ts b/src/next/tokens.ts
index def62dd3..d7ca23c2 100644
--- a/src/next/tokens.ts
+++ b/src/next/tokens.ts
@@ -167,7 +167,7 @@ export async function getTokens(
 }
 
 export async function getCookiesTokens(
-  cookies: Partial<{[K in string]: string}>,
+  cookies: CookiesObject,
   options: GetCookiesTokensOptions
 ): Promise<CustomTokens> {
   const parser = CookieParserFactory.fromObject(cookies, options);