diff --git a/mailwizz/client.py b/mailwizz/client.py
index 8eff165..462dee9 100644
--- a/mailwizz/client.py
+++ b/mailwizz/client.py
@@ -46,6 +46,10 @@ class Client(Base):
     # the DELETE params sent in the request.
     params_delete = {}
 
+    # Whether or not to pass data to requests using json kwarg
+    # Only applies (currently) to PUT
+    send_as_json = False
+
     def __init__(self, options):
         self.__populate(options)
 
@@ -119,3 +123,6 @@ def __populate(self, options):
 
         if 'headers' in options:
             self.headers = options['headers']
+
+        if 'send_as_json' in options:
+            self.send_as_json = options['send_as_json']
diff --git a/mailwizz/endpoint/list_subscribers.py b/mailwizz/endpoint/list_subscribers.py
index f30e57a..7d35b7b 100644
--- a/mailwizz/endpoint/list_subscribers.py
+++ b/mailwizz/endpoint/list_subscribers.py
@@ -59,7 +59,7 @@ def create(self, list_uid: str, data: dict):
         client = Client({
             'method': Client.METHOD_POST,
             'url': self.config.get_api_url('lists/{list_uid}/subscribers'.format(list_uid=list_uid)),
-            'params_post': data
+            'params_post': data,
         })
 
         return client.request()
@@ -81,12 +81,14 @@ def create_bulk(self, list_uid: str, data):
 
         return client.request()
 
-    def update(self, list_uid: str, subscriber_uid: str, data: dict):
+    def update(self, list_uid: str, subscriber_uid: str,
+               data: dict, send_as_json: bool = False):
         """
         Update existing subscriber in given list
         :param list_uid:
         :param subscriber_uid:
         :param data:
+        :param send_as_json: whether or not to send body as json
         :return:
         """
 
@@ -98,7 +100,8 @@ def update(self, list_uid: str, subscriber_uid: str, data: dict):
                     subscriber_uid=subscriber_uid
                 )
             ),
-            'params_put': data
+            'params_put': data,
+            'send_as_json': send_as_json
         })
 
         return client.request()
diff --git a/mailwizz/request.py b/mailwizz/request.py
index 8273f41..e301596 100644
--- a/mailwizz/request.py
+++ b/mailwizz/request.py
@@ -56,38 +56,30 @@ def _make_request(self):
         """
 
         client = self.client
+        kwargs = {
+            'url': client.url,
+            'headers': client.headers,
+            'timeout': client.timeout
+        }
 
         if client.is_get_method():
-            return requests.get(
-                url=client.url,
-                params=client.params_get,
-                headers=client.headers,
-                timeout=client.timeout
-            )
+            kwargs['params'] = client.params_get
+            return requests.get(**kwargs)
 
         if client.is_post_method():
-            return requests.post(
-                url=client.url,
-                data=client.params_post,
-                headers=client.headers,
-                timeout=client.timeout
-            )
+            kwargs['data'] = client.params_post
+            return requests.post(**kwargs)
 
         if client.is_put_method():
-            return requests.put(
-                url=client.url,
-                data=client.params_put,
-                headers=client.headers,
-                timeout=client.timeout
-            )
+            if client.send_as_json:
+                kwargs['json'] = client.params_put
+            else:
+                kwargs['data'] = client.params_put
+            return requests.put(**kwargs)
 
         if client.is_delete_method():
-            return requests.delete(
-                url=client.url,
-                data=client.params_put,
-                headers=client.headers,
-                timeout=client.timeout
-            )
+            kwargs['data'] = client.params_put
+            return requests.delete(**kwargs)
 
     def _sign(self, request_url):
         """