diff --git a/AUTHORS.md b/AUTHORS.md
index 340a0a94b..45d00eda7 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -15,6 +15,7 @@ Authors
 * [Alex Gaynor](https://github.com/alex)
 * [Alex Halderman](https://github.com/jhalderm)
 * [Alex Jordan](https://github.com/strugee)
+* [Alex Zorin](https://github.com/alexzorin)
 * [Amjad Mashaal](https://github.com/TheNavigat)
 * [Andrew Murray](https://github.com/radarhere)
 * [Anselm Levskaya](https://github.com/levskaya)
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 091ec0493..6f0da8ce1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ Certbot adheres to [Semantic Versioning](https://semver.org/).
 
 ### Added
 
-*
+* acme: Authz deactivation added to `acme` module.
 
 ### Changed
 
diff --git a/acme/acme/client.py b/acme/acme/client.py
index 5a8fd88ae..9698c7609 100644
--- a/acme/acme/client.py
+++ b/acme/acme/client.py
@@ -123,6 +123,21 @@ class ClientBase(object):  # pylint: disable=too-many-instance-attributes
         """
         return self.update_registration(regr, update={'status': 'deactivated'})
 
+    def deactivate_authorization(self, authzr):
+        # type: (messages.AuthorizationResource) -> messages.AuthorizationResource
+        """Deactivate authorization.
+
+        :param messages.AuthorizationResource authzr: The Authorization resource
+            to be deactivated.
+
+        :returns: The Authorization resource that was deactivated.
+        :rtype: `.AuthorizationResource`
+
+        """
+        body = messages.UpdateAuthorization(status='deactivated')
+        response = self._post(authzr.uri, body)
+        return self._authzr_from_response(response)
+
     def _authzr_from_response(self, response, identifier=None, uri=None):
         authzr = messages.AuthorizationResource(
             body=messages.Authorization.from_json(response.json()),
diff --git a/acme/acme/client_test.py b/acme/acme/client_test.py
index 406201751..4c762031b 100644
--- a/acme/acme/client_test.py
+++ b/acme/acme/client_test.py
@@ -637,6 +637,14 @@ class ClientTest(ClientTestBase):
             errors.PollError, self.client.poll_and_request_issuance,
             csr, authzrs, mintime=mintime, max_attempts=2)
 
+    def test_deactivate_authorization(self):
+        authzb = self.authzr.body.update(status=messages.STATUS_DEACTIVATED)
+        self.response.json.return_value = authzb.to_json()
+        authzr = self.client.deactivate_authorization(self.authzr)
+        self.assertEqual(authzb, authzr.body)
+        self.assertEqual(self.client.net.post.call_count, 1)
+        self.assertTrue(self.authzr.uri in self.net.post.call_args_list[0][0])
+
     def test_check_cert(self):
         self.response.headers['Location'] = self.certr.uri
         self.response.content = CERT_DER
diff --git a/acme/acme/messages.py b/acme/acme/messages.py
index df96b5f2b..2bfe688d2 100644
--- a/acme/acme/messages.py
+++ b/acme/acme/messages.py
@@ -168,6 +168,7 @@ STATUS_VALID = Status('valid')
 STATUS_INVALID = Status('invalid')
 STATUS_REVOKED = Status('revoked')
 STATUS_READY = Status('ready')
+STATUS_DEACTIVATED = Status('deactivated')
 
 
 class IdentifierType(_Constant):
@@ -471,7 +472,7 @@ class Authorization(ResourceBody):
     :ivar datetime.datetime expires:
 
     """
-    identifier = jose.Field('identifier', decoder=Identifier.from_json)
+    identifier = jose.Field('identifier', decoder=Identifier.from_json, omitempty=True)
     challenges = jose.Field('challenges', omitempty=True)
     combinations = jose.Field('combinations', omitempty=True)
 
@@ -501,6 +502,12 @@ class NewAuthorization(Authorization):
     resource = fields.Resource(resource_type)
 
 
+class UpdateAuthorization(Authorization):
+    """Update authorization."""
+    resource_type = 'authz'
+    resource = fields.Resource(resource_type)
+
+
 class AuthorizationResource(ResourceWithURI):
     """Authorization Resource.