diff --git a/VERSION b/VERSION
index 79a2734..4b9fcbe 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.5.0
\ No newline at end of file
+0.5.1
diff --git a/giftless/auth/jwt.py b/giftless/auth/jwt.py
index e1ff8ab..5e7f43e 100644
--- a/giftless/auth/jwt.py
+++ b/giftless/auth/jwt.py
@@ -151,7 +151,7 @@ def _generate_token_for_action(self, identity: Identity, org: str, repo: str, ac
         if lifetime:
             token_payload['exp'] = datetime.now(tz=UTC) + timedelta(seconds=lifetime)
 
-        return self._generate_token(**token_payload).decode('ascii')
+        return self._generate_token(**token_payload)
 
     @staticmethod
     def _generate_action_scopes(org: str, repo: str, actions: Optional[Set[str]] = None, oid: Optional[str] = None) \
@@ -163,7 +163,7 @@ def _generate_action_scopes(org: str, repo: str, actions: Optional[Set[str]] = N
         obj_id = f'{org}/{repo}/{oid}'
         return str(Scope('obj', obj_id, actions))
 
-    def _generate_token(self, **kwargs) -> bytes:
+    def _generate_token(self, **kwargs) -> str:
         """Generate a JWT token that can be used later to authenticate a request
         """
         if not self.private_key:
@@ -187,7 +187,13 @@ def _generate_token(self, **kwargs) -> bytes:
         if self.key_id:
             headers['kid'] = self.key_id
 
-        return jwt.encode(payload, self.private_key, algorithm=self.algorithm, headers=headers)  # type: ignore
+        token = jwt.encode(payload, self.private_key, algorithm=self.algorithm, headers=headers)
+        # Type of jwt.encode() went from bytes to str in jwt 2.x, but the
+        # typing hints somehow aren't keeping up.  This lets us do the
+        # right thing with jwt 2.x.
+        if type(token) == str:
+            return token  # type: ignore
+        return token.decode('ascii')
 
     def _authenticate(self, request: Request):
         """Authenticate a request
diff --git a/giftless/storage/google_cloud.py b/giftless/storage/google_cloud.py
index 2eda066..5e4f11f 100644
--- a/giftless/storage/google_cloud.py
+++ b/giftless/storage/google_cloud.py
@@ -3,9 +3,9 @@
 import json
 import posixpath
 from datetime import timedelta
-from typing import Any, BinaryIO, Dict, Optional
+from typing import Any, BinaryIO, Dict, Optional, Union
 
-import google.auth
+import google.auth  # type: ignore
 from google.auth import impersonated_credentials
 from google.cloud import storage  # type: ignore
 from google.oauth2 import service_account  # type: ignore
@@ -30,7 +30,11 @@ def __init__(self,
                  **_):
         self.bucket_name = bucket_name
         self.path_prefix = path_prefix
-        self.credentials: Optional[service_account.Credentials] = self._load_credentials(account_key_file, account_key_base64)
+        self.credentials: Optional[Union[
+            service_account.Credentials, impersonated_credentials.Credentials
+        ]] = self._load_credentials(
+            account_key_file, account_key_base64
+        )
         self.storage_client = storage.Client(project=project_name, credentials=self.credentials)
         if not self.credentials:
             if not serviceaccount_email:
@@ -38,7 +42,7 @@ def __init__(self,
                     "If no account key is given, serviceaccount_email must "
                     "be set in order to use workload identity."
                 )
-            self._serviceaccount_email=serviceaccount_email
+            self._serviceaccount_email = serviceaccount_email
 
     def get(self, prefix: str, oid: str) -> BinaryIO:
         bucket = self.storage_client.bucket(self.bucket_name)
@@ -137,7 +141,9 @@ def _load_credentials(account_key_file: Optional[str], account_key_base64: Optio
         else:
             return None  # Will use Workload Identity if available
 
-    def _get_workload_identity_credentials(self, expires_in: int) -> None:
+    def _get_workload_identity_credentials(
+        self, expires_in: int
+    ) -> impersonated_credentials.Credentials:
         lifetime = expires_in
         if lifetime > 3600:
             lifetime = 3600  # Signing credentials are good for one hour max
diff --git a/tests/auth/test_jwt.py b/tests/auth/test_jwt.py
index 52cd960..f3dedec 100644
--- a/tests/auth/test_jwt.py
+++ b/tests/auth/test_jwt.py
@@ -263,4 +263,4 @@ def _get_test_token(lifetime=300, headers=None, algo='HS256', **kwargs):
     else:
         raise ValueError("Don't know how to test algo: {}".format(algo))
 
-    return jwt.encode(payload, key, algorithm=algo, headers=headers).decode('utf8')
+    return jwt.encode(payload, key, algorithm=algo, headers=headers)