diff --git a/.changeset/bright-balloons-talk.md b/.changeset/bright-balloons-talk.md
new file mode 100644
index 00000000000..a771614e79c
--- /dev/null
+++ b/.changeset/bright-balloons-talk.md
@@ -0,0 +1,5 @@
+---
+'@firebase/auth': major
+---
+
+Changed the type of ParsedToken value from any to unknown
diff --git a/common/api-review/auth.api.md b/common/api-review/auth.api.md
index 96a175f28f9..70aad0a4712 100644
--- a/common/api-review/auth.api.md
+++ b/common/api-review/auth.api.md
@@ -550,7 +550,7 @@ export function parseActionCodeURL(link: string): ActionCodeURL | null;
 
 // @public
 export interface ParsedToken {
-    [key: string]: any;
+    [key: string]: unknown;
     'auth_time'?: string;
     'exp'?: string;
     'firebase'?: {
diff --git a/packages/auth/package.json b/packages/auth/package.json
index e28095dca69..f036b1eeb99 100644
--- a/packages/auth/package.json
+++ b/packages/auth/package.json
@@ -122,14 +122,14 @@
     "@firebase/app": "0.9.13",
     "@rollup/plugin-json": "4.1.0",
     "@rollup/plugin-strip": "2.1.0",
+    "@types/express": "4.17.17",
     "chromedriver": "98.0.1",
     "rollup": "2.79.1",
     "rollup-plugin-sourcemaps": "0.6.3",
     "rollup-plugin-typescript2": "0.31.2",
     "selenium-webdriver": "4.8.0",
-    "typescript": "4.7.4",
-    "@types/express": "4.17.17",
-    "totp-generator": "0.0.14"
+    "totp-generator": "0.0.14",
+    "typescript": "4.7.4"
   },
   "repository": {
     "directory": "packages/auth",
diff --git a/packages/auth/src/core/user/id_token_result.test.ts b/packages/auth/src/core/user/id_token_result.test.ts
index ee635e8053a..92cf6b4c232 100644
--- a/packages/auth/src/core/user/id_token_result.test.ts
+++ b/packages/auth/src/core/user/id_token_result.test.ts
@@ -20,6 +20,7 @@ import chaiAsPromised from 'chai-as-promised';
 import * as sinon from 'sinon';
 
 import { ProviderId } from '../../model/enums';
+import { ParsedToken } from '../../model/public_types';
 import { FirebaseError } from '@firebase/util';
 
 import { makeJWT } from '../../../test/helpers/jwt';
@@ -139,4 +140,15 @@ describe('core/user/id_token_result', () => {
       'Firebase: An internal AuthError has occurred. (auth/internal-error).'
     );
   });
+
+  it('Parses custom claims with multiple types', () => {
+    const token: ParsedToken = {
+      'string_claim': 'foo',
+      'object_claim': { key1: 'value1' },
+      'boolean_claim': true
+    };
+    expect(token.boolean_claim as boolean).to.equal(true);
+    expect(token.string_claim as string).to.equal('foo');
+    expect((token.object_claim as { key1: string }).key1).to.equal('value1');
+  });
 });
diff --git a/packages/auth/src/model/public_types.ts b/packages/auth/src/model/public_types.ts
index 30f202a1b8e..bc2b2569936 100644
--- a/packages/auth/src/model/public_types.ts
+++ b/packages/auth/src/model/public_types.ts
@@ -106,7 +106,7 @@ export interface ParsedToken {
     'identities'?: Record<string, string>;
   };
   /** Map of any additional custom claims. */
-  [key: string]: any;
+  [key: string]: unknown;
 }
 
 /**