diff --git a/acme/acme/client.py b/acme/acme/client.py
index 6c5ed79a2..d6166960d 100644
--- a/acme/acme/client.py
+++ b/acme/acme/client.py
@@ -71,20 +71,13 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
             self.directory = directory
 
     @classmethod
-    def _regr_from_response(cls, response, uri=None, new_authzr_uri=None,
-                            terms_of_service=None):
+    def _regr_from_response(cls, response, uri=None, terms_of_service=None):
         if 'terms-of-service' in response.links:
             terms_of_service = response.links['terms-of-service']['url']
-        if 'next' in response.links:
-            new_authzr_uri = response.links['next']['url']
-
-        if new_authzr_uri is None:
-            raise errors.ClientError('"next" link missing')
 
         return messages.RegistrationResource(
             body=messages.Registration.from_json(response.json()),
             uri=response.headers.get('Location', uri),
-            new_authzr_uri=new_authzr_uri,
             terms_of_service=terms_of_service)
 
     def register(self, new_reg=None):
@@ -117,7 +110,7 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
         # (c.f. acme-spec #94)
 
         return self._regr_from_response(
-            response, uri=regr.uri, new_authzr_uri=regr.new_authzr_uri,
+            response, uri=regr.uri,
             terms_of_service=regr.terms_of_service)
 
     def update_registration(self, regr, update=None):
@@ -172,19 +165,10 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
         return self.update_registration(
             regr.update(body=regr.body.update(agreement=regr.terms_of_service)))
 
-    def _authzr_from_response(self, response, identifier,
-                              uri=None, new_cert_uri=None):
-        # pylint: disable=no-self-use
-        if new_cert_uri is None:
-            try:
-                new_cert_uri = response.links['next']['url']
-            except KeyError:
-                raise errors.ClientError('"next" link missing')
-
+    def _authzr_from_response(self, response, identifier, uri=None):
         authzr = messages.AuthorizationResource(
             body=messages.Authorization.from_json(response.json()),
-            uri=response.headers.get('Location', uri),
-            new_cert_uri=new_cert_uri)
+            uri=response.headers.get('Location', uri))
         if authzr.body.identifier != identifier:
             raise errors.UnexpectedUpdate(authzr)
         return authzr
@@ -193,17 +177,16 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
         """Request challenges.
 
         :param .messages.Identifier identifier: Identifier to be challenged.
-        :param str new_authzr_uri: ``new-authorization`` URI. If omitted,
-            will default to value found in ``directory``.
+        :param str new_authzr_uri: Deprecated. Do not use.
 
         :returns: Authorization Resource.
         :rtype: `.AuthorizationResource`
 
         """
+        if new_authzr_uri is not None:
+            logger.debug("request_challenges with new_authzr_uri deprecated.")
         new_authz = messages.NewAuthorization(identifier=identifier)
-        response = self.net.post(self.directory.new_authz
-                                 if new_authzr_uri is None else new_authzr_uri,
-                                 new_authz)
+        response = self.net.post(self.directory.new_authz, new_authz)
         # TODO: handle errors
         assert response.status_code == http_client.CREATED
         return self._authzr_from_response(response, identifier)
@@ -217,6 +200,7 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
         documentation.
 
         :param str domain: Domain name to be challenged.
+        :param str new_authzr_uri: Deprecated. Do not use.
 
         :returns: Authorization Resource.
         :rtype: `.AuthorizationResource`
@@ -298,7 +282,7 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
         """
         response = self.net.get(authzr.uri)
         updated_authzr = self._authzr_from_response(
-            response, authzr.body.identifier, authzr.uri, authzr.new_cert_uri)
+            response, authzr.body.identifier, authzr.uri)
         return updated_authzr, response
 
     def request_issuance(self, csr, authzrs):
@@ -321,7 +305,7 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
 
         content_type = DER_CONTENT_TYPE  # TODO: add 'cert_type 'argument
         response = self.net.post(
-            authzrs[0].new_cert_uri,  # TODO: acme-spec #90
+            self.directory.new_cert,
             req,
             content_type=content_type,
             headers={'Accept': content_type})
diff --git a/acme/acme/client_test.py b/acme/acme/client_test.py
index 7e7ffe779..09bb38c00 100644
--- a/acme/acme/client_test.py
+++ b/acme/acme/client_test.py
@@ -40,6 +40,8 @@ class ClientTest(unittest.TestCase):
                 'https://www.letsencrypt-demo.org/acme/revoke-cert',
             messages.NewAuthorization:
                 'https://www.letsencrypt-demo.org/acme/new-authz',
+            messages.CertificateRequest:
+                'https://www.letsencrypt-demo.org/acme/new-cert',
         })
 
         from acme.client import Client
@@ -56,7 +58,6 @@ class ClientTest(unittest.TestCase):
         self.new_reg = messages.NewRegistration(**dict(reg))
         self.regr = messages.RegistrationResource(
             body=reg, uri='https://www.letsencrypt-demo.org/acme/reg/1',
-            new_authzr_uri='https://www.letsencrypt-demo.org/acme/new-reg',
             terms_of_service='https://www.letsencrypt-demo.org/tos')
 
         # Authorization
@@ -72,8 +73,7 @@ class ClientTest(unittest.TestCase):
                 typ=messages.IDENTIFIER_FQDN, value='example.com'),
             challenges=(challb,), combinations=None)
         self.authzr = messages.AuthorizationResource(
-            body=self.authz, uri=authzr_uri,
-            new_cert_uri='https://www.letsencrypt-demo.org/acme/new-cert')
+            body=self.authz, uri=authzr_uri)
 
         # Request issuance
         self.certr = messages.CertificateResource(
@@ -98,18 +98,12 @@ class ClientTest(unittest.TestCase):
         self.response.json.return_value = self.regr.body.to_json()
         self.response.headers['Location'] = self.regr.uri
         self.response.links.update({
-            'next': {'url': self.regr.new_authzr_uri},
             'terms-of-service': {'url': self.regr.terms_of_service},
         })
 
         self.assertEqual(self.regr, self.client.register(self.new_reg))
         # TODO: test POST call arguments
 
-    def test_register_missing_next(self):
-        self.response.status_code = http_client.CREATED
-        self.assertRaises(
-            errors.ClientError, self.client.register, self.new_reg)
-
     def test_update_registration(self):
         # "Instance of 'Field' has no to_json/update member" bug:
         # pylint: disable=no-member
@@ -132,13 +126,6 @@ class ClientTest(unittest.TestCase):
         self.response.json.return_value = self.regr.body.to_json()
         self.assertEqual(self.regr, self.client.query_registration(self.regr))
 
-    def test_query_registration_updates_new_authzr_uri(self):
-        self.response.json.return_value = self.regr.body.to_json()
-        self.response.links = {'next': {'url': 'UPDATED'}}
-        self.assertEqual(
-            'UPDATED',
-            self.client.query_registration(self.regr).new_authzr_uri)
-
     def test_agree_to_tos(self):
         self.client.update_registration = mock.Mock()
         self.client.agree_to_tos(self.regr)
@@ -149,9 +136,6 @@ class ClientTest(unittest.TestCase):
         self.response.status_code = http_client.CREATED
         self.response.headers['Location'] = self.authzr.uri
         self.response.json.return_value = self.authz.to_json()
-        self.response.links = {
-            'next': {'url': self.authzr.new_cert_uri},
-        }
 
     def test_request_challenges(self):
         self._prepare_response_for_request_challenges()
@@ -160,10 +144,18 @@ class ClientTest(unittest.TestCase):
             self.directory.new_authz,
             messages.NewAuthorization(identifier=self.identifier))
 
+    def test_request_challenges_deprecated_arg(self):
+        self._prepare_response_for_request_challenges()
+        self.client.request_challenges(self.identifier, new_authzr_uri="hi")
+        self.net.post.assert_called_once_with(
+            self.directory.new_authz,
+            messages.NewAuthorization(identifier=self.identifier))
+
     def test_request_challenges_custom_uri(self):
         self._prepare_response_for_request_challenges()
-        self.client.request_challenges(self.identifier, 'URI')
-        self.net.post.assert_called_once_with('URI', mock.ANY)
+        self.client.request_challenges(self.identifier)
+        self.net.post.assert_called_once_with(
+            'https://www.letsencrypt-demo.org/acme/new-authz', mock.ANY)
 
     def test_request_challenges_unexpected_update(self):
         self._prepare_response_for_request_challenges()
@@ -171,12 +163,7 @@ class ClientTest(unittest.TestCase):
             identifier=self.identifier.update(value='foo')).to_json()
         self.assertRaises(
             errors.UnexpectedUpdate, self.client.request_challenges,
-            self.identifier, self.authzr.uri)
-
-    def test_request_challenges_missing_next(self):
-        self.response.status_code = http_client.CREATED
-        self.assertRaises(errors.ClientError, self.client.request_challenges,
-                          self.identifier)
+            self.identifier)
 
     def test_request_domain_challenges(self):
         self.client.request_challenges = mock.MagicMock()
@@ -184,12 +171,6 @@ class ClientTest(unittest.TestCase):
             self.client.request_challenges(self.identifier),
             self.client.request_domain_challenges('example.com'))
 
-    def test_request_domain_challenges_custom_uri(self):
-        self.client.request_challenges = mock.MagicMock()
-        self.assertEqual(
-            self.client.request_challenges(self.identifier, 'URI'),
-            self.client.request_domain_challenges('example.com', 'URI'))
-
     def test_answer_challenge(self):
         self.response.links['up'] = {'url': self.challr.authzr_uri}
         self.response.json.return_value = self.challr.body.to_json()
diff --git a/acme/acme/jose/json_util.py b/acme/acme/jose/json_util.py
index d474f4aac..4baadda5e 100644
--- a/acme/acme/jose/json_util.py
+++ b/acme/acme/jose/json_util.py
@@ -267,7 +267,7 @@ class JSONObjectWithFields(util.ImmutableMap, interfaces.JSONDeSerializable):
 
         if missing:
             raise errors.DeserializationError(
-                'The following field are required: {0}'.format(
+                'The following fields are required: {0}'.format(
                     ','.join(missing)))
 
     @classmethod
diff --git a/acme/acme/messages.py b/acme/acme/messages.py
index 54cd25c94..f7670dd72 100644
--- a/acme/acme/messages.py
+++ b/acme/acme/messages.py
@@ -191,7 +191,7 @@ class Directory(jose.JSONDeSerializable):
         try:
             return self[name.replace('_', '-')]
         except KeyError as error:
-            raise AttributeError(str(error))
+            raise AttributeError(str(error) + ': ' + name)
 
     def __getitem__(self, name):
         try:
@@ -315,12 +315,12 @@ class RegistrationResource(ResourceWithURI):
     """Registration Resource.
 
     :ivar acme.messages.Registration body:
-    :ivar unicode new_authzr_uri: URI found in the 'next' ``Link`` header
+    :ivar unicode new_authzr_uri: Deprecated. Do not use.
     :ivar unicode terms_of_service: URL for the CA TOS.
 
     """
     body = jose.Field('body', decoder=Registration.from_json)
-    new_authzr_uri = jose.Field('new_authzr_uri')
+    new_authzr_uri = jose.Field('new_authzr_uri', omitempty=True)
     terms_of_service = jose.Field('terms_of_service', omitempty=True)
 
 
@@ -425,11 +425,11 @@ class AuthorizationResource(ResourceWithURI):
     """Authorization Resource.
 
     :ivar acme.messages.Authorization body:
-    :ivar unicode new_cert_uri: URI found in the 'next' ``Link`` header
+    :ivar unicode new_cert_uri: Deprecated. Do not use.
 
     """
     body = jose.Field('body', decoder=Authorization.from_json)
-    new_cert_uri = jose.Field('new_cert_uri')
+    new_cert_uri = jose.Field('new_cert_uri', omitempty=True)
 
 
 @Directory.register
diff --git a/acme/acme/messages_test.py b/acme/acme/messages_test.py
index b3454f25b..e84c3e992 100644
--- a/acme/acme/messages_test.py
+++ b/acme/acme/messages_test.py
@@ -225,14 +225,12 @@ class RegistrationResourceTest(unittest.TestCase):
         from acme.messages import RegistrationResource
         self.regr = RegistrationResource(
             body=mock.sentinel.body, uri=mock.sentinel.uri,
-            new_authzr_uri=mock.sentinel.new_authzr_uri,
             terms_of_service=mock.sentinel.terms_of_service)
 
     def test_to_partial_json(self):
         self.assertEqual(self.regr.to_json(), {
             'body': mock.sentinel.body,
             'uri': mock.sentinel.uri,
-            'new_authzr_uri': mock.sentinel.new_authzr_uri,
             'terms_of_service': mock.sentinel.terms_of_service,
         })
 
@@ -346,9 +344,7 @@ class AuthorizationResourceTest(unittest.TestCase):
         from acme.messages import AuthorizationResource
         authzr = AuthorizationResource(
             uri=mock.sentinel.uri,
-            body=mock.sentinel.body,
-            new_cert_uri=mock.sentinel.new_cert_uri,
-        )
+            body=mock.sentinel.body)
         self.assertTrue(isinstance(authzr, jose.JSONDeSerializable))
 
 
diff --git a/acme/examples/example_client.py b/acme/examples/example_client.py
index 261b37603..1386491b1 100644
--- a/acme/examples/example_client.py
+++ b/acme/examples/example_client.py
@@ -32,8 +32,7 @@ acme.agree_to_tos(regr)
 logging.debug(regr)
 
 authzr = acme.request_challenges(
-    identifier=messages.Identifier(typ=messages.IDENTIFIER_FQDN, value=DOMAIN),
-    new_authzr_uri=regr.new_authzr_uri)
+    identifier=messages.Identifier(typ=messages.IDENTIFIER_FQDN, value=DOMAIN))
 logging.debug(authzr)
 
 authzr, authzr_response = acme.poll(authzr)
diff --git a/certbot/account.py b/certbot/account.py
index 4b5f48411..1928b90d8 100644
--- a/certbot/account.py
+++ b/certbot/account.py
@@ -98,7 +98,7 @@ def report_new_account(config):
 
 
 class AccountMemoryStorage(interfaces.AccountStorage):
-    """In-memory account strage."""
+    """In-memory account storage."""
 
     def __init__(self, initial_accounts=None):
         self.accounts = initial_accounts if initial_accounts is not None else {}
@@ -106,7 +106,8 @@ class AccountMemoryStorage(interfaces.AccountStorage):
     def find_all(self):
         return list(six.itervalues(self.accounts))
 
-    def save(self, account):
+    def save(self, account, acme):
+        # pylint: disable=unused-argument
         if account.id in self.accounts:
             logger.debug("Overwriting account: %s", account.id)
         self.accounts[account.id] = account
@@ -117,6 +118,16 @@ class AccountMemoryStorage(interfaces.AccountStorage):
         except KeyError:
             raise errors.AccountNotFound(account_id)
 
+class RegistrationResourceWithNewAuthzrURI(messages.RegistrationResource):
+    """A backwards-compatible RegistrationResource with a new-authz URI.
+
+       Hack: Certbot versions pre-0.11.1 expect to load
+       new_authzr_uri as part of the account. Because people
+       sometimes switch between old and new versions, we will
+       continue to write out this field for some time so older
+       clients don't crash in that scenario.
+    """
+    new_authzr_uri = jose.Field('new_authzr_uri')
 
 class AccountFileStorage(interfaces.AccountStorage):
     """Accounts file storage.
@@ -181,16 +192,16 @@ class AccountFileStorage(interfaces.AccountStorage):
                     account_id, acc.id))
         return acc
 
-    def save(self, account):
-        self._save(account, regr_only=False)
+    def save(self, account, acme):
+        self._save(account, acme, regr_only=False)
 
-    def save_regr(self, account):
+    def save_regr(self, account, acme):
         """Save the registration resource.
 
         :param Account account: account whose regr should be saved
 
         """
-        self._save(account, regr_only=True)
+        self._save(account, acme, regr_only=True)
 
     def delete(self, account_id):
         """Delete registration info from disk
@@ -204,13 +215,19 @@ class AccountFileStorage(interfaces.AccountStorage):
                 "Account at %s does not exist" % account_dir_path)
         shutil.rmtree(account_dir_path)
 
-    def _save(self, account, regr_only):
+    def _save(self, account, acme, regr_only):
         account_dir_path = self._account_dir_path(account.id)
         util.make_or_verify_dir(account_dir_path, 0o700, os.geteuid(),
                                 self.config.strict_permissions)
         try:
             with open(self._regr_path(account_dir_path), "w") as regr_file:
-                regr_file.write(account.regr.json_dumps())
+                regr = account.regr
+                with_uri = RegistrationResourceWithNewAuthzrURI(
+                    new_authzr_uri=acme.directory.new_authz,
+                    body=regr.body,
+                    uri=regr.uri,
+                    terms_of_service=regr.terms_of_service)
+                regr_file.write(with_uri.json_dumps())
             if not regr_only:
                 with util.safe_open(self._key_path(account_dir_path),
                                     "w", chmod=0o400) as key_file:
diff --git a/certbot/auth_handler.py b/certbot/auth_handler.py
index 6e9ab25a7..53346a77c 100644
--- a/certbot/auth_handler.py
+++ b/certbot/auth_handler.py
@@ -63,8 +63,7 @@ class AuthHandler(object):
 
         """
         for domain in domains:
-            self.authzr[domain] = self.acme.request_domain_challenges(
-                domain, self.account.regr.new_authzr_uri)
+            self.authzr[domain] = self.acme.request_domain_challenges(domain)
 
         self._choose_challenges(domains)
 
diff --git a/certbot/client.py b/certbot/client.py
index a342c1bf3..0f6b35f09 100644
--- a/certbot/client.py
+++ b/certbot/client.py
@@ -138,7 +138,7 @@ def register(config, account_storage, tos_cb=None):
 
     acc = account.Account(regr, key)
     account.report_new_account(config)
-    account_storage.save(acc)
+    account_storage.save(acc, acme)
 
     eff.handle_subscription(config)
 
diff --git a/certbot/interfaces.py b/certbot/interfaces.py
index 2df2abfe8..a2767121b 100644
--- a/certbot/interfaces.py
+++ b/certbot/interfaces.py
@@ -32,7 +32,7 @@ class AccountStorage(object):
         raise NotImplementedError()
 
     @abc.abstractmethod
-    def save(self, account):  # pragma: no cover
+    def save(self, account, client):  # pragma: no cover
         """Save account.
 
         :raises .AccountStorageError: if account could not be saved
diff --git a/certbot/main.py b/certbot/main.py
index 118c0f958..1f247a7d6 100644
--- a/certbot/main.py
+++ b/certbot/main.py
@@ -466,7 +466,7 @@ def register(config, unused_plugins):
     # We rely on an exception to interrupt this process if it didn't work.
     acc.regr = acme_client.acme.update_registration(acc.regr.update(
         body=acc.regr.body.update(contact=('mailto:' + config.email,))))
-    account_storage.save_regr(acc)
+    account_storage.save_regr(acc, acme_client.acme)
     eff.handle_subscription(config)
     add_msg("Your e-mail address was updated to {0}.".format(config.email))
 
diff --git a/certbot/tests/account_test.py b/certbot/tests/account_test.py
index 8ed591c98..7d335b09b 100644
--- a/certbot/tests/account_test.py
+++ b/certbot/tests/account_test.py
@@ -1,5 +1,6 @@
 """Tests for certbot.account."""
 import datetime
+import json
 import os
 import shutil
 import stat
@@ -90,10 +91,10 @@ class AccountMemoryStorageTest(unittest.TestCase):
         account = mock.Mock(id="x")
         self.assertEqual([], self.storage.find_all())
         self.assertRaises(errors.AccountNotFound, self.storage.load, "x")
-        self.storage.save(account)
+        self.storage.save(account, None)
         self.assertEqual([account], self.storage.find_all())
         self.assertEqual(account, self.storage.load("x"))
-        self.storage.save(account)
+        self.storage.save(account, None)
         self.assertEqual([account], self.storage.find_all())
 
 
@@ -108,10 +109,14 @@ class AccountFileStorageTest(unittest.TestCase):
         self.storage = AccountFileStorage(self.config)
 
         from certbot.account import Account
+        new_authzr_uri = "hi"
         self.acc = Account(
             regr=messages.RegistrationResource(
-                uri=None, new_authzr_uri=None, body=messages.Registration()),
+                uri=None, body=messages.Registration(),
+                new_authzr_uri=new_authzr_uri),
             key=KEY)
+        self.mock_client = mock.MagicMock()
+        self.mock_client.directory.new_authz = new_authzr_uri
 
     def tearDown(self):
         shutil.rmtree(self.tmp)
@@ -120,7 +125,7 @@ class AccountFileStorageTest(unittest.TestCase):
         self.assertTrue(os.path.isdir(self.config.accounts_dir))
 
     def test_save_and_restore(self):
-        self.storage.save(self.acc)
+        self.storage.save(self.acc, self.mock_client)
         account_path = os.path.join(self.config.accounts_dir, self.acc.id)
         self.assertTrue(os.path.exists(account_path))
         for file_name in "regr.json", "meta.json", "private_key.json":
@@ -130,10 +135,19 @@ class AccountFileStorageTest(unittest.TestCase):
             account_path, "private_key.json"))[stat.ST_MODE] & 0o777) in ("0400", "0o400"))
 
         # restore
-        self.assertEqual(self.acc, self.storage.load(self.acc.id))
+        loaded = self.storage.load(self.acc.id)
+        self.assertEqual(self.acc, loaded)
+
+    def test_save_and_restore_old_version(self):
+        """Saved regr should include a new_authzr_uri for older Certbots"""
+        self.storage.save(self.acc, self.mock_client)
+        path = os.path.join(self.config.accounts_dir, self.acc.id, "regr.json")
+        with open(path, "r") as f:
+            regr = json.load(f)
+        self.assertTrue("new_authzr_uri" in regr)
 
     def test_save_regr(self):
-        self.storage.save_regr(self.acc)
+        self.storage.save_regr(self.acc, self.mock_client)
         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(
@@ -143,7 +157,7 @@ class AccountFileStorageTest(unittest.TestCase):
                 os.path.join(account_path, file_name)))
 
     def test_find_all(self):
-        self.storage.save(self.acc)
+        self.storage.save(self.acc, self.mock_client)
         self.assertEqual([self.acc], self.storage.find_all())
 
     def test_find_all_none_empty_list(self):
@@ -164,14 +178,14 @@ class AccountFileStorageTest(unittest.TestCase):
         self.assertRaises(errors.AccountNotFound, self.storage.load, "missing")
 
     def test_load_id_mismatch_raises_error(self):
-        self.storage.save(self.acc)
+        self.storage.save(self.acc, self.mock_client)
         shutil.move(os.path.join(self.config.accounts_dir, self.acc.id),
                     os.path.join(self.config.accounts_dir, "x" + self.acc.id))
         self.assertRaises(errors.AccountStorageError, self.storage.load,
                           "x" + self.acc.id)
 
     def test_load_ioerror(self):
-        self.storage.save(self.acc)
+        self.storage.save(self.acc, self.mock_client)
         mock_open = mock.mock_open()
         mock_open.side_effect = IOError
         with mock.patch("six.moves.builtins.open", mock_open):
@@ -183,10 +197,11 @@ class AccountFileStorageTest(unittest.TestCase):
         mock_open.side_effect = IOError  # TODO: [None, None, IOError]
         with mock.patch("six.moves.builtins.open", mock_open):
             self.assertRaises(
-                errors.AccountStorageError, self.storage.save, self.acc)
+                errors.AccountStorageError, self.storage.save,
+                    self.acc, self.mock_client)
 
     def test_delete(self):
-        self.storage.save(self.acc)
+        self.storage.save(self.acc, self.mock_client)
         self.storage.delete(self.acc.id)
         self.assertRaises(errors.AccountNotFound, self.storage.load, self.acc.id)
 
diff --git a/certbot/tests/acme_util.py b/certbot/tests/acme_util.py
index 5e6b190a7..f0549666a 100644
--- a/certbot/tests/acme_util.py
+++ b/certbot/tests/acme_util.py
@@ -96,6 +96,5 @@ def gen_authzr(authz_status, domain, challs, statuses, combos=True):
     # pylint: disable=star-args
     return messages.AuthorizationResource(
         uri="https://trusted.ca/new-authz-resource",
-        new_cert_uri="https://trusted.ca/new-cert",
         body=messages.Authorization(**authz_kwargs)
     )
diff --git a/certbot/tests/auth_handler_test.py b/certbot/tests/auth_handler_test.py
index 046eb5ef1..9d22843db 100644
--- a/certbot/tests/auth_handler_test.py
+++ b/certbot/tests/auth_handler_test.py
@@ -309,7 +309,6 @@ class PollChallengesTest(unittest.TestCase):
 
         new_authzr = messages.AuthorizationResource(
             uri=authzr.uri,
-            new_cert_uri=authzr.new_cert_uri,
             body=messages.Authorization(
                 identifier=authzr.body.identifier,
                 challenges=new_challbs,
@@ -437,7 +436,7 @@ def gen_auth_resp(chall_list):
             for chall in chall_list]
 
 
-def gen_dom_authzr(domain, unused_new_authzr_uri, challs, combos=True):
+def gen_dom_authzr(domain, challs, combos=True):
     """Generates new authzr for domains."""
     return acme_util.gen_authzr(
         messages.STATUS_PENDING, domain, challs,
diff --git a/certbot/tests/display/ops_test.py b/certbot/tests/display/ops_test.py
index f6de33a92..f2a9b3d07 100644
--- a/certbot/tests/display/ops_test.py
+++ b/certbot/tests/display/ops_test.py
@@ -104,10 +104,10 @@ class ChooseAccountTest(unittest.TestCase):
         self.key = KEY
 
         self.acc1 = account.Account(messages.RegistrationResource(
-            uri=None, new_authzr_uri=None, body=messages.Registration.from_data(
+            uri=None, body=messages.Registration.from_data(
                 email="email1@g.com")), self.key)
         self.acc2 = account.Account(messages.RegistrationResource(
-            uri=None, new_authzr_uri=None, body=messages.Registration.from_data(
+            uri=None, body=messages.Registration.from_data(
                 email="email2@g.com", phone="phone")), self.key)
 
     @classmethod
diff --git a/certbot/tests/main_test.py b/certbot/tests/main_test.py
index 3520eb063..170eceb48 100644
--- a/certbot/tests/main_test.py
+++ b/certbot/tests/main_test.py
@@ -382,6 +382,9 @@ class DetermineAccountTest(unittest.TestCase):
         self.config = configuration.NamespaceConfig(self.args)
         self.accs = [mock.MagicMock(id='x'), mock.MagicMock(id='y')]
         self.account_storage = account.AccountMemoryStorage()
+        # For use in saving accounts: fake out the new_authz URL.
+        self.mock_client = mock.MagicMock()
+        self.mock_client.directory.new_authz = "hi"
 
     def _call(self):
         # pylint: disable=protected-access
@@ -391,14 +394,14 @@ class DetermineAccountTest(unittest.TestCase):
             return _determine_account(self.config)
 
     def test_args_account_set(self):
-        self.account_storage.save(self.accs[1])
+        self.account_storage.save(self.accs[1], self.mock_client)
         self.config.account = self.accs[1].id
         self.assertEqual((self.accs[1], None), self._call())
         self.assertEqual(self.accs[1].id, self.config.account)
         self.assertTrue(self.config.email is None)
 
     def test_single_account(self):
-        self.account_storage.save(self.accs[0])
+        self.account_storage.save(self.accs[0], self.mock_client)
         self.assertEqual((self.accs[0], None), self._call())
         self.assertEqual(self.accs[0].id, self.config.account)
         self.assertTrue(self.config.email is None)
@@ -406,7 +409,7 @@ class DetermineAccountTest(unittest.TestCase):
     @mock.patch('certbot.client.display_ops.choose_account')
     def test_multiple_accounts(self, mock_choose_accounts):
         for acc in self.accs:
-            self.account_storage.save(acc)
+            self.account_storage.save(acc, self.mock_client)
         mock_choose_accounts.return_value = self.accs[1]
         self.assertEqual((self.accs[1], None), self._call())
         self.assertEqual(