diff --git a/.changeset/spotty-pillows-applaud.md b/.changeset/spotty-pillows-applaud.md
new file mode 100644
index 00000000000..d951adf1d5c
--- /dev/null
+++ b/.changeset/spotty-pillows-applaud.md
@@ -0,0 +1,5 @@
+---
+"@firebase/auth": patch
+---
+
+Update custom claim type of `ParsedToken` to be `any`
diff --git a/common/api-review/auth.api.md b/common/api-review/auth.api.md
index 47fc7ec5417..045b64bcf19 100644
--- a/common/api-review/auth.api.md
+++ b/common/api-review/auth.api.md
@@ -538,7 +538,7 @@ export function parseActionCodeURL(link: string): ActionCodeURL | null;
 
 // @public
 export interface ParsedToken {
-    [key: string]: string | object | undefined;
+    [key: string]: any;
     'auth_time'?: string;
     'exp'?: string;
     'firebase'?: {
diff --git a/packages/auth/src/model/public_types.ts b/packages/auth/src/model/public_types.ts
index ea6dc857962..fdef53e6850 100644
--- a/packages/auth/src/model/public_types.ts
+++ b/packages/auth/src/model/public_types.ts
@@ -15,6 +15,8 @@
  * limitations under the License.
  */
 
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
 import { FirebaseApp } from '@firebase/app';
 import {
   CompleteFn,
@@ -104,7 +106,7 @@ export interface ParsedToken {
     'identities'?: Record<string, string>;
   };
   /** Map of any additional custom claims. */
-  [key: string]: string | object | undefined;
+  [key: string]: any;
 }
 
 /**