diff --git a/.changeset/lazy-ducks-fix.md b/.changeset/lazy-ducks-fix.md
new file mode 100644
index 0000000..708c9e9
--- /dev/null
+++ b/.changeset/lazy-ducks-fix.md
@@ -0,0 +1,5 @@
+---
+"@animo-id/oauth2": patch
+---
+
+feat: add refresh_token grant type
diff --git a/packages/oauth2/src/Oauth2Client.ts b/packages/oauth2/src/Oauth2Client.ts
index 9752900..614aeba 100644
--- a/packages/oauth2/src/Oauth2Client.ts
+++ b/packages/oauth2/src/Oauth2Client.ts
@@ -2,8 +2,10 @@ import { objectToQueryParams } from '@animo-id/oauth2-utils'
 import {
   type RetrieveAuthorizationCodeAccessTokenOptions,
   type RetrievePreAuthorizedCodeAccessTokenOptions,
+  type RetrieveRefreshTokenAccessTokenOptions,
   retrieveAuthorizationCodeAccessToken,
   retrievePreAuthorizedCodeAccessToken,
+  retrieveRefreshTokenAccessToken,
 } from './access-token/retrieve-access-token'
 import {
   type SendAuthorizationChallengeRequestOptions,
@@ -186,6 +188,25 @@ export class Oauth2Client {
     return result
   }
 
+  public async retrieveRefreshTokenAccessToken({
+    authorizationServerMetadata,
+    additionalRequestPayload,
+    refreshToken,
+    resource,
+    dpop,
+  }: Omit<RetrieveRefreshTokenAccessTokenOptions, 'callbacks'>) {
+    const result = await retrieveRefreshTokenAccessToken({
+      authorizationServerMetadata,
+      refreshToken,
+      additionalRequestPayload,
+      resource,
+      callbacks: this.options.callbacks,
+      dpop,
+    })
+
+    return result
+  }
+
   public async resourceRequest(options: ResourceRequestOptions) {
     return resourceRequest(options)
   }
diff --git a/packages/oauth2/src/access-token/retrieve-access-token.ts b/packages/oauth2/src/access-token/retrieve-access-token.ts
index 1f0ac49..59cc32f 100644
--- a/packages/oauth2/src/access-token/retrieve-access-token.ts
+++ b/packages/oauth2/src/access-token/retrieve-access-token.ts
@@ -7,7 +7,11 @@ import { type RequestDpopOptions, createDpopJwt, extractDpopNonceFromHeaders } f
 import { shouldRetryTokenRequestWithDPoPNonce } from '../dpop/dpop-retry'
 import { Oauth2ClientErrorResponseError } from '../error/Oauth2ClientErrorResponseError'
 import type { AuthorizationServerMetadata } from '../metadata/authorization-server/v-authorization-server-metadata'
-import { authorizationCodeGrantIdentifier, preAuthorizedCodeGrantIdentifier } from '../v-grant-type'
+import {
+  authorizationCodeGrantIdentifier,
+  preAuthorizedCodeGrantIdentifier,
+  refreshTokenGrantIdentifier,
+} from '../v-grant-type'
 import {
   type AccessTokenRequest,
   type AccessTokenResponse,
@@ -126,6 +130,39 @@ export async function retrieveAuthorizationCodeAccessToken(
   return accessTokenResponse
 }
 
+export interface RetrieveRefreshTokenAccessTokenOptions extends RetrieveAccessTokenBaseOptions {
+  /**
+   * The refresh token
+   */
+  refreshToken: string
+
+  /**
+   * Additional payload to include in the access token request. Items will be encoded and sent
+   * using x-www-form-urlencoded format. Nested items (JSON) will be stringified and url encoded.
+   */
+  additionalRequestPayload?: Record<string, unknown>
+}
+
+export async function retrieveRefreshTokenAccessToken(
+  options: RetrieveRefreshTokenAccessTokenOptions
+): Promise<RetrieveAccessTokenReturn> {
+  const request = {
+    grant_type: refreshTokenGrantIdentifier,
+    refresh_token: options.refreshToken,
+    resource: options.resource,
+    ...options.additionalRequestPayload,
+  } satisfies AccessTokenRequest
+
+  const accessTokenResponse = await retrieveAccessTokenWithDpopRetry({
+    authorizationServerMetadata: options.authorizationServerMetadata,
+    request,
+    dpop: options.dpop,
+    callbacks: options.callbacks,
+  })
+
+  return accessTokenResponse
+}
+
 interface RetrieveAccessTokenOptions extends RetrieveAccessTokenBaseOptions {
   /**
    * The access token request body
diff --git a/packages/oauth2/src/access-token/v-access-token.ts b/packages/oauth2/src/access-token/v-access-token.ts
index bafbd25..3a8dbb9 100644
--- a/packages/oauth2/src/access-token/v-access-token.ts
+++ b/packages/oauth2/src/access-token/v-access-token.ts
@@ -2,7 +2,11 @@ import * as v from 'valibot'
 
 import { vHttpsUrl } from '@animo-id/oauth2-utils'
 import { vOauth2ErrorResponse } from '../common/v-oauth2-error'
-import { vAuthorizationCodeGrantIdentifier, vPreAuthorizedCodeGrantIdentifier } from '../v-grant-type'
+import {
+  vAuthorizationCodeGrantIdentifier,
+  vPreAuthorizedCodeGrantIdentifier,
+  vRefreshTokenGrantIdentifier,
+} from '../v-grant-type'
 
 export const vAccessTokenRequest = v.intersect([
   v.looseObject({
@@ -13,12 +17,16 @@ export const vAccessTokenRequest = v.intersect([
     code: v.optional(v.string()),
     redirect_uri: v.optional(v.pipe(v.string(), v.url())),
 
+    // Refresh token grant
+    refresh_token: v.optional(v.string()),
+
     resource: v.optional(vHttpsUrl),
     code_verifier: v.optional(v.string()),
 
     grant_type: v.union([
       vPreAuthorizedCodeGrantIdentifier,
       vAuthorizationCodeGrantIdentifier,
+      vRefreshTokenGrantIdentifier,
       // string makes the previous ones unessary, but it does help with error messages
       v.string(),
     ]),
@@ -53,6 +61,8 @@ export const vAccessTokenResponse = v.looseObject({
   scope: v.optional(v.string()),
   state: v.optional(v.string()),
 
+  refresh_token: v.optional(v.string()),
+
   // Oid4vci specific parameters
   c_nonce: v.optional(v.string()),
   c_nonce_expires_in: v.optional(v.pipe(v.number(), v.integer())),
diff --git a/packages/oauth2/src/index.ts b/packages/oauth2/src/index.ts
index cb9de1a..9eb454e 100644
--- a/packages/oauth2/src/index.ts
+++ b/packages/oauth2/src/index.ts
@@ -120,4 +120,7 @@ export {
   type PreAuthorizedCodeGrantIdentifier,
   vPreAuthorizedCodeGrantIdentifier,
   preAuthorizedCodeGrantIdentifier,
+  type RefreshTokenGrantIdentifier,
+  vRefreshTokenGrantIdentifier,
+  refreshTokenGrantIdentifier,
 } from './v-grant-type'
diff --git a/packages/oauth2/src/v-grant-type.ts b/packages/oauth2/src/v-grant-type.ts
index 312de16..b48514b 100644
--- a/packages/oauth2/src/v-grant-type.ts
+++ b/packages/oauth2/src/v-grant-type.ts
@@ -7,3 +7,7 @@ export type PreAuthorizedCodeGrantIdentifier = v.InferOutput<typeof vPreAuthoriz
 export const vAuthorizationCodeGrantIdentifier = v.literal('authorization_code')
 export const authorizationCodeGrantIdentifier = vAuthorizationCodeGrantIdentifier.literal
 export type AuthorizationCodeGrantIdentifier = v.InferOutput<typeof vAuthorizationCodeGrantIdentifier>
+
+export const vRefreshTokenGrantIdentifier = v.literal('refresh_token')
+export const refreshTokenGrantIdentifier = vRefreshTokenGrantIdentifier.literal
+export type RefreshTokenGrantIdentifier = v.InferOutput<typeof vRefreshTokenGrantIdentifier>