diff --git a/acme/acme/client.py b/acme/acme/client.py
index 5d623265e..b8b145720 100644
--- a/acme/acme/client.py
+++ b/acme/acme/client.py
@@ -49,6 +49,7 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
     :ivar messages.Directory directory:
     :ivar key: `.JWK` (private)
     :ivar account: `.Account` (private)
+    :ivar acme_version: `int` (private)
     :ivar alg: `.JWASignature`
     :ivar bool verify_ssl: Verify SSL certificates?
     :ivar .ClientNetwork net: Client network. Useful for testing. If not
@@ -58,8 +59,8 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
     """
 
     # pylint: disable=too-many-arguments
-    def __init__(self, directory, key, account=None, alg=jose.RS256, verify_ssl=True,
-                 net=None):
+    def __init__(self, directory, key, account=None, acme_version=1, alg=jose.RS256,
+                 verify_ssl=True, net=None):
         """Initialize.
 
         :param directory: Directory Resource (`.messages.Directory`) or
@@ -68,8 +69,9 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
         """
         self.key = key
         self.account = account
-        self.net = ClientNetwork(key, account=account, alg=alg,
-            verify_ssl=verify_ssl) if net is None else net
+        self.acme_version = acme_version
+        self.net = ClientNetwork(key, account=account, acme_version=acme_version,
+            alg=alg, verify_ssl=verify_ssl) if net is None else net
 
         if isinstance(directory, six.string_types):
             self.directory = messages.Directory.from_json(
@@ -90,16 +92,20 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
     def register(self, new_reg=None):
         """Register.
 
-        :param .NewRegistration new_reg:
+        :param .NewRegistration or .NewAccount new_reg:
 
         :returns: Registration Resource.
         :rtype: `.RegistrationResource`
 
         """
-        new_reg = messages.NewRegistration() if new_reg is None else new_reg
-        assert isinstance(new_reg, messages.NewRegistration)
+        if self.acme_version == 2:
+            url = self.directory.new_account
+            new_reg = messages.NewAccount() if new_reg is None else new_reg
+        else:
+            url = self.directory.new_reg
+            new_reg = messages.NewRegistration() if new_reg is None else new_reg
 
-        response = self.net.post(self.directory.new_reg, new_reg)
+        response = self.net.post(url, new_reg)
         # TODO: handle errors
         assert response.status_code == http_client.CREATED
 
diff --git a/acme/acme/messages.py b/acme/acme/messages.py
index 4b4fa5003..2c1a198eb 100644
--- a/acme/acme/messages.py
+++ b/acme/acme/messages.py
@@ -288,6 +288,13 @@ class NewRegistration(Registration):
     resource = fields.Resource(resource_type)
 
 
+@Directory.register
+class NewAccount(Registration):
+    """New account."""
+    resource_type = 'new-account' # not used
+    resource = fields.Resource(resource_type)
+
+
 class UpdateRegistration(Registration):
     """Update registration."""
     resource_type = 'reg'