diff --git a/README.md b/README.md
index 188306c..6a8c9cc 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,9 @@ The documentation for python-keycloak is available on [readthedocs](http://pytho
 * [Marcos Pereira](marcospereira.mpj@gmail.com)
 * [Martin Devlin](martin.devlin@pearson.com) 
 * [Shon T. Urbas](shon.urbas@gmail.com>)
+* [Markus Spanier]()
+* [Remco Kranenburg]()
+* [Remco Kranenburg]()
 
 ## Usage
 
diff --git a/keycloak/keycloak_openid.py b/keycloak/keycloak_openid.py
index f1dcde4..c579052 100644
--- a/keycloak/keycloak_openid.py
+++ b/keycloak/keycloak_openid.py
@@ -150,7 +150,7 @@ class KeycloakOpenID:
         """
         return NotImplemented
 
-    def token(self, username, password, grant_type=["password"]):
+    def token(self, username="", password="", grant_type=["password"], code="", redirect_uri=""):
         """
         The token endpoint is used to obtain tokens. Tokens can either be obtained by
         exchanging an authorization code or by supplying credentials directly depending on
@@ -162,11 +162,14 @@ class KeycloakOpenID:
         :param username:
         :param password:
         :param grant_type:
+        :param code:
+        :param redirect_uri
         :return:
         """
         params_path = {"realm-name": self.realm_name}
         payload = {"username": username, "password": password,
-                   "client_id": self.client_id, "grant_type": grant_type}
+                   "client_id": self.client_id, "grant_type": grant_type,
+                   "code": code, "redirect_uri": redirect_uri}
 
         payload = self._add_secret_key(payload)
         data_raw = self.connection.raw_post(URL_TOKEN.format(**params_path),
diff --git a/requirements.txt b/requirements.txt
index 386a0c8..f03af1b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-requests==2.18.4
-httmock==1.2.5
-python-jose==1.4.0
-simplejson
\ No newline at end of file
+requests>=2.18.4
+httmock>=1.2.5
+python-jose>=1.4.0
+simplejson