diff --git a/certbot/CHANGELOG.md b/certbot/CHANGELOG.md
index 387373fff..cc7e5e78f 100644
--- a/certbot/CHANGELOG.md
+++ b/certbot/CHANGELOG.md
@@ -17,7 +17,7 @@ Certbot adheres to [Semantic Versioning](https://semver.org/).
 
 ### Fixed
 
-*
+* Fixed a crash when registering an account with BuyPass' ACME server.
 
 More details about these changes can be found on our GitHub repo.
 
diff --git a/certbot/certbot/_internal/account.py b/certbot/certbot/_internal/account.py
index 8dcf1de09..e289245b1 100644
--- a/certbot/certbot/_internal/account.py
+++ b/certbot/certbot/_internal/account.py
@@ -242,11 +242,11 @@ class AccountFileStorage(interfaces.AccountStorage):
             dir_path = self._prepare(account)
             self._create(account, dir_path)
             self._update_meta(account, dir_path)
-            self._update_regr(account, client, dir_path)
+            self._update_regr(account, dir_path)
         except IOError as error:
             raise errors.AccountStorageError(error)
 
-    def update_regr(self, account: Account, client: ClientV2) -> None:
+    def update_regr(self, account: Account) -> None:
         """Update the registration resource.
 
         :param Account account: account to update
@@ -255,7 +255,7 @@ class AccountFileStorage(interfaces.AccountStorage):
         """
         try:
             dir_path = self._prepare(account)
-            self._update_regr(account, client, dir_path)
+            self._update_regr(account, dir_path)
         except IOError as error:
             raise errors.AccountStorageError(error)
 
@@ -346,7 +346,7 @@ class AccountFileStorage(interfaces.AccountStorage):
         with util.safe_open(self._key_path(dir_path), "w", chmod=0o400) as key_file:
             key_file.write(account.key.json_dumps())
 
-    def _update_regr(self, account: Account, acme: ClientV2, dir_path: str) -> None:
+    def _update_regr(self, account: Account, dir_path: str) -> None:
         with open(self._regr_path(dir_path), "w") as regr_file:
             regr = messages.RegistrationResource(
                 body={},
diff --git a/certbot/certbot/_internal/main.py b/certbot/certbot/_internal/main.py
index 0712f1962..316503c5d 100644
--- a/certbot/certbot/_internal/main.py
+++ b/certbot/certbot/_internal/main.py
@@ -948,7 +948,7 @@ def update_account(config: configuration.NamespaceConfig,
     # the v2 uri. Since it's the same object on disk, put it back to the v1 uri
     # so that we can also continue to use the account object with acmev1.
     acc.regr = acc.regr.update(uri=prev_regr_uri)
-    account_storage.update_regr(acc, cb_client.acme)
+    account_storage.update_regr(acc)
 
     if not config.email:
         display_util.notify("Any contact information associated "
diff --git a/certbot/tests/account_test.py b/certbot/tests/account_test.py
index e0972f247..f00ac363d 100644
--- a/certbot/tests/account_test.py
+++ b/certbot/tests/account_test.py
@@ -141,7 +141,7 @@ class AccountFileStorageTest(test_util.ConfigTestCase):
         self.assertEqual(self.acc, loaded)
 
     def test_update_regr(self):
-        self.storage.update_regr(self.acc, self.mock_client)
+        self.storage.update_regr(self.acc)
         account_path = os.path.join(self.config.accounts_dir, self.acc.id)
         self.assertTrue(os.path.exists(account_path))
         self.assertTrue(os.path.exists(os.path.join(account_path, "regr.json")))