diff --git a/README.md b/README.md
index f7e3337..e158a79 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 Powered by [Ilhasoft's Web Team](http://www.ilhasoft.com.br/en/).
 
-Portainer CLI is a Python software to use in command line. Use this command line interface to easy communicate to your [Portainer](https://portainer.io/) application, like in a continuous integration and continuous deploy environments.
+Portainer CLI is a Python software to use in command line. Use this command line interface to easy communicate with your [Portainer](https://portainer.io/) application, like in a continuous integration and continuous deployment environments.
 
 ## Install
 
@@ -61,13 +61,13 @@ portainer-cli update_stack id endpoint_id [stack_file]
 portainer-cli update_stack 2 1 docker-compose.yml
 ```
 
-#### update_stack command environment variables arguments
+#### Environment variables arguments
 
 ```bash
 portainer-cli update_stack id endpoint_id [stack_file] --env.var=value
 ```
 
-Where `var` is environment variable name and `value` is the environment variable value.
+Where `var` is the environment variable name and `value` is the environment variable value.
 
 #### Flags
 
@@ -76,6 +76,28 @@ Where `var` is environment variable name and `value` is the environment variable
 | `-p` or `--prune` | Prune services |
 | `-c` or `--clear-env` | Clear all environment variables |
 
+### update_registry command
+
+Update registry.
+
+```bash
+portainer-cli update_registry id [-name] [-url]
+```
+
+**E.g:**
+
+```bash
+portainer-cli update_registry 1 -name="Some registry" -url="some.url.com/r"
+```
+
+#### Authentication
+
+You can use authentication passing `-a` or `--authentication` flag, but you must pass the `-username` and `-password` options.
+
+```bash
+portainer-cli update_registry 1 -a -username=douglas -password=d1234
+```
+
 ### request command
 
 Make a request.
diff --git a/portainer_cli/__init__.py b/portainer_cli/__init__.py
index fd90d84..b1e5fca 100755
--- a/portainer_cli/__init__.py
+++ b/portainer_cli/__init__.py
@@ -33,11 +33,13 @@ class PortainerCLI(object):
     COMMAND_LOGIN = 'login'
     COMMAND_REQUEST = 'request'
     COMMAND_UPDATE_STACK = 'update_stack'
+    COMMAND_UPDATE_REGISTRY = 'update_registry'
     COMMANDS = [
         COMMAND_CONFIGURE,
         COMMAND_LOGIN,
         COMMAND_REQUEST,
         COMMAND_UPDATE_STACK,
+        COMMAND_UPDATE_REGISTRY,
     ]
 
     METHOD_GET = 'GET'
@@ -156,6 +158,31 @@ class PortainerCLI(object):
             data,
         )
 
+    @plac.annotations(
+        name=('Name', 'option'),
+        url=('URL', 'option'),
+        authentication=('Use authentication', 'flag', 'a'),
+        username=('Username', 'option'),
+        password=('Password', 'option'),
+    )
+    def update_registry(self, id, name='', url='', authentication=False,
+                        username='', password=''):
+        assert not authentication or (authentication and username and password)
+        registry_url = f'registries/{id}'
+        current = self.request(registry_url).json()
+        data = {
+            'Name': name or current.get('Name'),
+            'URL': url or current.get('URL'),
+            'Authentication': authentication,
+            'Username': username or current.get('Username'),
+            'Password': password,
+        }
+        self.request(
+            registry_url,
+            self.METHOD_PUT,
+            data,
+        )
+
     @plac.annotations(
         printc=('Print response content', 'flag', 'p'),
     )
@@ -206,5 +233,7 @@ class PortainerCLI(object):
             plac.call(self.login, args)
         elif command == self.COMMAND_UPDATE_STACK:
             plac.call(self.update_stack, args)
+        elif command == self.COMMAND_UPDATE_REGISTRY:
+            plac.call(self.update_registry, args)
         elif command == self.COMMAND_REQUEST:
             plac.call(self.request, args)