diff --git a/packages/jwt/.gitignore b/packages/jwt/.gitignore
index 526da158..ac1d378f 100644
--- a/packages/jwt/.gitignore
+++ b/packages/jwt/.gitignore
@@ -4,4 +4,7 @@
 .dart_tool/
 .packages
 build/
-pubspec.lock
\ No newline at end of file
+pubspec.lock
+
+# Test related files
+coverage/
diff --git a/packages/jwt/lib/src/jwt.dart b/packages/jwt/lib/src/jwt.dart
index 5e098858..97b1d88e 100644
--- a/packages/jwt/lib/src/jwt.dart
+++ b/packages/jwt/lib/src/jwt.dart
@@ -149,9 +149,13 @@ void _verifyPayload(JwtPayload payload, String issuer, String audience) {
     throw const JwtVerificationFailure('Token issued at a future time.');
   }
 
-  final authTime = DateTime.fromMillisecondsSinceEpoch(payload.authTime * 1000);
-  if (authTime.isAfter(now)) {
-    throw const JwtVerificationFailure('Authenticated at a future time.');
+  if (payload.authTime != null) {
+    final authTime = DateTime.fromMillisecondsSinceEpoch(
+      payload.authTime! * 1000,
+    );
+    if (authTime.isAfter(now)) {
+      throw const JwtVerificationFailure('Authenticated at a future time.');
+    }
   }
 
   if (payload.aud != audience) {
diff --git a/packages/jwt/lib/src/models/jwt_payload.dart b/packages/jwt/lib/src/models/jwt_payload.dart
index 469e2050..850226b7 100644
--- a/packages/jwt/lib/src/models/jwt_payload.dart
+++ b/packages/jwt/lib/src/models/jwt_payload.dart
@@ -14,7 +14,7 @@ class JwtPayload {
     required this.aud,
     required this.iss,
     required this.sub,
-    required this.authTime,
+    this.authTime,
   });
 
   /// Decode a [JwtPayload] from a `Map<String, dynamic>`.
@@ -38,5 +38,5 @@ class JwtPayload {
   final String sub;
 
   /// Time when authentication occurred.
-  final int authTime;
+  final int? authTime;
 }
diff --git a/packages/jwt/lib/src/models/jwt_payload.g.dart b/packages/jwt/lib/src/models/jwt_payload.g.dart
index b2cc38bf..98dd8ef9 100644
--- a/packages/jwt/lib/src/models/jwt_payload.g.dart
+++ b/packages/jwt/lib/src/models/jwt_payload.g.dart
@@ -18,7 +18,7 @@ JwtPayload _$JwtPayloadFromJson(Map<String, dynamic> json) => $checkedCreate(
           aud: $checkedConvert('aud', (v) => v as String),
           iss: $checkedConvert('iss', (v) => v as String),
           sub: $checkedConvert('sub', (v) => v as String),
-          authTime: $checkedConvert('auth_time', (v) => v as int),
+          authTime: $checkedConvert('auth_time', (v) => v as int?),
         );
         return val;
       },
diff --git a/packages/jwt/test/src/jwt_test.dart b/packages/jwt/test/src/jwt_test.dart
index 152eaeee..76a96e51 100644
--- a/packages/jwt/test/src/jwt_test.dart
+++ b/packages/jwt/test/src/jwt_test.dart
@@ -10,6 +10,8 @@ import 'package:test/test.dart';
 void main() {
   const token =
       '''eyJhbGciOiJSUzI1NiIsImtpZCI6ImMxMGM5MGJhNGMzNjYzNTE2ZTA3MDdkMGU5YTg5NDgxMDYyODUxNTgiLCJ0eXAiOiJKV1QifQ.eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2dsZS5jb20vbXktYXBwIiwiYXVkIjoibXktYXBwIiwiYXV0aF90aW1lIjoxNjQzNjg0MjY2LCJ1c2VyX2lkIjoiRzR1MzdXdk90dmVWR0pRb1pCWGpxcHVWazZWMiIsInN1YiI6Ikc0dTM3V3ZPdHZlVkdKUW9aQlhqcXB1Vms2VjIiLCJpYXQiOjE2NDM2ODQyNjYsImV4cCI6MTY0MzY4Nzg2NiwiZW1haWwiOiJ0ZXN0QGdtYWlsLmNvbSIsImVtYWlsX3ZlcmlmaWVkIjp0cnVlLCJmaXJlYmFzZSI6eyJpZGVudGl0aWVzIjp7ImVtYWlsIjpbInRlc3RAZ21haWwuY29tIl19LCJzaWduX2luX3Byb3ZpZGVyIjoicGFzc3dvcmQifX0.bUWnX_XmR1d9EmeFeYSsK_CHU1u9NPIHgyaQueZ6urYOtxvuL_QodjPl0c9CBJwctwPnxVyRmkeNCw0oF9xBgph0NApLL4FIG6vpDPZfW9txZBYr8xIvaqvmD0diACENAQdjRT2XmyEdQ2-U7SsTonybHmLoU9FMQTjAgw4NCALQvExfB6rtQ9GDsOBt1xoBkB3Vo7a5OmugZ1aHXF69b8As6137-Dggf5qx5R3oLRFovICMMesQziE3vGi-WKcbQxSeiD-9a6ShPAhk41XiyjFGDEOtUCQo63uwQnMw3g0KVtC6bzIyFq-E91vhxumxXzxPYC-kg7iUYiSZy7Y-Aw''';
+  const tokenNoAuthTime =
+      '''eyJhbGciOiJSUzI1NiIsImtpZCI6ImMxMGM5MGJhNGMzNjYzNTE2ZTA3MDdkMGU5YTg5NDgxMDYyODUxNTgiLCJ0eXAiOiJKV1QifQ.eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2dsZS5jb20vbXktYXBwIiwiYXVkIjoibXktYXBwIiwidXNlcl9pZCI6Ikc0dTM3V3ZPdHZlVkdKUW9aQlhqcXB1Vms2VjIiLCJzdWIiOiJHNHUzN1d2T3R2ZVZHSlFvWkJYanFwdVZrNlYyIiwiaWF0IjoxNjQzNjg0MjY2LCJleHAiOjE2NDM2ODc4NjYsImVtYWlsIjoidGVzdEBnbWFpbC5jb20iLCJlbWFpbF92ZXJpZmllZCI6dHJ1ZSwiZmlyZWJhc2UiOnsiaWRlbnRpdGllcyI6eyJlbWFpbCI6WyJ0ZXN0QGdtYWlsLmNvbSJdfSwic2lnbl9pbl9wcm92aWRlciI6InBhc3N3b3JkIn19.ZWCadE43mUk43cPQdNCCi4WhDgB4ZsDT9rhPGQq_1uFPhzkVrCSRcjUhwkzH11VLap_MVurNvI_pGWbu9Z4CRPvGFzXPpuNveWy2qFPEa4jcM-R40vsbrP30vNnrp4PrmqgLar0vWs6FZ2g9fbjU8L1LaU5ik31OKSXufTIKn_hPHhyIC33tYTpWzG3Abq3H9EELHUXKW9nEcN8YYnOHAZ3A6ymb3DyBguhf2O-XAIlrn1WoxRRqlukFGSmprk7heonbVUTzoc3sIDZcC-Cj1U9wTee1NmqmU7v3SvpBRGnuXz-5rzSRHblyVxn_EEfCYwjsDUwetYpyFcCs5dqPlQ''';
   const publicKeysUrl =
       'https://www.googleapis.com/robot/v1/metadata/x509/securetoken@system.gserviceaccount.com';
   const issuer = 'https://securetoken.google.com/my-app';
@@ -133,6 +135,25 @@ void main() {
         expect(jwt, isA<Jwt>());
       });
     });
+
+    test('can verify a valid jwt w/out auth_time', () async {
+      await withClock(Clock.fixed(validTime), () async {
+        getOverride = (Uri uri) async {
+          return Response(
+            body,
+            HttpStatus.ok,
+            headers: {'cache-control': 'max-age=3600'},
+          );
+        };
+        final jwt = await verify(
+          tokenNoAuthTime,
+          audience: audience,
+          issuer: issuer,
+          publicKeysUrl: publicKeysUrl,
+        );
+        expect(jwt, isA<Jwt>());
+      });
+    });
   });
 
   group('base64Padded', () {