diff --git a/src/keycloak/connection.py b/src/keycloak/connection.py
index c4881f0..9d55c37 100644
--- a/src/keycloak/connection.py
+++ b/src/keycloak/connection.py
@@ -49,9 +49,13 @@ class ConnectionManager(object):
     :type verify: Union[bool,str]
     :param proxies: The proxies servers requests is sent by.
     :type proxies: dict
+    :param cert: An SSL certificate used by the requested host to authenticate the client.
+        Either a path to an SSL certificate file, or two-tuple of
+        (certificate file, key file).
+    :type cert: Union[str,Tuple[str,str]]
     """
 
-    def __init__(self, base_url, headers={}, timeout=60, verify=True, proxies=None):
+    def __init__(self, base_url, headers={}, timeout=60, verify=True, proxies=None, cert=None):
         """Init method.
 
         :param base_url: The server URL.
@@ -65,11 +69,16 @@ class ConnectionManager(object):
         :type verify: Union[bool,str]
         :param proxies: The proxies servers requests is sent by.
         :type proxies: dict
+        :param cert: An SSL certificate used by the requested host to authenticate the client.
+            Either a path to an SSL certificate file, or two-tuple of
+            (certificate file, key file).
+        :type cert: Union[str,Tuple[str,str]]
         """
         self.base_url = base_url
         self.headers = headers
         self.timeout = timeout
         self.verify = verify
+        self.cert = cert
         self._s = requests.Session()
         self._s.auth = lambda x: x  # don't let requests add auth headers
 
@@ -87,7 +96,7 @@ class ConnectionManager(object):
         if proxies:
             self._s.proxies.update(proxies)
 
-        self.async_s = httpx.AsyncClient(verify=verify, proxies=proxies)
+        self.async_s = httpx.AsyncClient(verify=verify, proxies=proxies, cert=cert)
         self.async_s.auth = None  # don't let requests add auth headers
         self.async_s.transport = httpx.AsyncHTTPTransport(retries=1)
 
@@ -140,6 +149,19 @@ class ConnectionManager(object):
     def verify(self, value):
         self._verify = value
 
+    @property
+    def cert(self):
+        """Return client certificates in use for request to the server.
+
+        :returns: Client certificate
+        :rtype: Union[str,Tuple[str,str]]
+        """
+        return self._cert
+
+    @cert.setter
+    def cert(self, value):
+        self._cert = value
+
     @property
     def headers(self):
         """Return header request to the server.
@@ -213,6 +235,7 @@ class ConnectionManager(object):
                 headers=self.headers,
                 timeout=self.timeout,
                 verify=self.verify,
+                cert=self.cert,
             )
         except Exception as e:
             raise KeycloakConnectionError("Can't connect to server (%s)" % e)
@@ -238,6 +261,7 @@ class ConnectionManager(object):
                 headers=self.headers,
                 timeout=self.timeout,
                 verify=self.verify,
+                cert=self.cert,
             )
         except Exception as e:
             raise KeycloakConnectionError("Can't connect to server (%s)" % e)
@@ -263,6 +287,7 @@ class ConnectionManager(object):
                 headers=self.headers,
                 timeout=self.timeout,
                 verify=self.verify,
+                cert=self.cert,
             )
         except Exception as e:
             raise KeycloakConnectionError("Can't connect to server (%s)" % e)
@@ -288,6 +313,7 @@ class ConnectionManager(object):
                 headers=self.headers,
                 timeout=self.timeout,
                 verify=self.verify,
+                cert=self.cert,
             )
             return r
         except Exception as e:
diff --git a/src/keycloak/keycloak_admin.py b/src/keycloak/keycloak_admin.py
index 41f2e46..8415d10 100644
--- a/src/keycloak/keycloak_admin.py
+++ b/src/keycloak/keycloak_admin.py
@@ -73,6 +73,10 @@ class KeycloakAdmin:
     :type user_realm_name: str
     :param timeout: connection timeout in seconds
     :type timeout: int
+    :param cert: An SSL certificate used by the requested host to authenticate the client.
+        Either a path to an SSL certificate file, or two-tuple of
+        (certificate file, key file).
+    :type cert: Union[str,Tuple[str,str]]
     :param connection: A KeycloakOpenIDConnection as an alternative to individual params.
     :type connection: KeycloakOpenIDConnection
     """
@@ -93,6 +97,7 @@ class KeycloakAdmin:
         custom_headers=None,
         user_realm_name=None,
         timeout=60,
+        cert=None,
         connection: Optional[KeycloakOpenIDConnection] = None,
     ):
         """Init method.
@@ -123,6 +128,9 @@ class KeycloakAdmin:
         :type user_realm_name: str
         :param timeout: connection timeout in seconds
         :type timeout: int
+        :param cert: An SSL certificate used by the requested host to authenticate the client.
+            Either a path to an SSL certificate file, or two-tuple of (certificate file, key file).
+        :type cert: Union[str,Tuple[str,str]]
         :param connection: An OpenID Connection as an alternative to individual params.
         :type connection: KeycloakOpenIDConnection
         """
@@ -139,6 +147,7 @@ class KeycloakAdmin:
             user_realm_name=user_realm_name,
             custom_headers=custom_headers,
             timeout=timeout,
+            cert=cert,
         )
 
     @property
diff --git a/src/keycloak/keycloak_openid.py b/src/keycloak/keycloak_openid.py
index 59ddabe..7c0a558 100644
--- a/src/keycloak/keycloak_openid.py
+++ b/src/keycloak/keycloak_openid.py
@@ -74,6 +74,9 @@ class KeycloakOpenID:
     :param custom_headers: dict of custom header to pass to each HTML request
     :param proxies: dict of proxies to sent the request by.
     :param timeout: connection timeout in seconds
+    :param cert: An SSL certificate used by the requested host to authenticate the client.
+        Either a path to an SSL certificate file, or two-tuple of
+        (certificate file, key file).
     """
 
     def __init__(
@@ -86,6 +89,7 @@ class KeycloakOpenID:
         custom_headers=None,
         proxies=None,
         timeout=60,
+        cert=None,
     ):
         """Init method.
 
@@ -106,13 +110,22 @@ class KeycloakOpenID:
         :type proxies: dict
         :param timeout: connection timeout in seconds
         :type timeout: int
+        :param cert: An SSL certificate used by the requested host to authenticate the client.
+            Either a path to an SSL certificate file, or two-tuple of
+            (certificate file, key file).
+        :type cert: Union[str,Tuple[str,str]]
         """
         self.client_id = client_id
         self.client_secret_key = client_secret_key
         self.realm_name = realm_name
         headers = custom_headers if custom_headers is not None else dict()
         self.connection = ConnectionManager(
-            base_url=server_url, headers=headers, timeout=timeout, verify=verify, proxies=proxies
+            base_url=server_url,
+            headers=headers,
+            timeout=timeout,
+            verify=verify,
+            proxies=proxies,
+            cert=cert,
         )
 
         self.authorization = Authorization()
diff --git a/src/keycloak/openid_connection.py b/src/keycloak/openid_connection.py
index c604356..15d2cb9 100644
--- a/src/keycloak/openid_connection.py
+++ b/src/keycloak/openid_connection.py
@@ -70,6 +70,7 @@ class KeycloakOpenIDConnection(ConnectionManager):
         custom_headers=None,
         user_realm_name=None,
         timeout=60,
+        cert=None,
     ):
         """Init method.
 
@@ -99,6 +100,10 @@ class KeycloakOpenIDConnection(ConnectionManager):
         :type user_realm_name: str
         :param timeout: connection timeout in seconds
         :type timeout: int
+        :param cert: An SSL certificate used by the requested host to authenticate the client.
+            Either a path to an SSL certificate file, or two-tuple of
+            (certificate file, key file).
+        :type cert: Union[str,Tuple[str,str]]
         """
         # token is renewed when it hits 90% of its lifetime. This is to account for any possible
         # clock skew.
@@ -117,12 +122,14 @@ class KeycloakOpenIDConnection(ConnectionManager):
         self.timeout = timeout
         self.custom_headers = custom_headers
         self.headers = {**self.headers, "Content-Type": "application/json"}
+        self.cert = cert
 
         super().__init__(
             base_url=self.server_url,
             headers=self.headers,
             timeout=self.timeout,
             verify=self.verify,
+            cert=cert,
         )
 
     @property
@@ -297,6 +304,7 @@ class KeycloakOpenIDConnection(ConnectionManager):
                 client_secret_key=self.client_secret_key,
                 timeout=self.timeout,
                 custom_headers=self.custom_headers,
+                cert=self.cert,
             )
 
         return self._keycloak_openid
diff --git a/tests/test_keycloak_admin.py b/tests/test_keycloak_admin.py
index c6e6448..b87f413 100644
--- a/tests/test_keycloak_admin.py
+++ b/tests/test_keycloak_admin.py
@@ -5198,10 +5198,7 @@ async def test_a_email_query_param_handling(admin: KeycloakAdmin, user: str):
     mock_put.assert_awaited_once_with(
         ANY,
         data='["UPDATE_PASSWORD"]',
-        params={
-            "client_id": "update-account-client-id",
-            "redirect_uri": "https://example.com",
-        },
+        params={"client_id": "update-account-client-id", "redirect_uri": "https://example.com"},
         headers=ANY,
         timeout=60,
     )
@@ -5216,10 +5213,7 @@ async def test_a_email_query_param_handling(admin: KeycloakAdmin, user: str):
     mock_put.assert_awaited_once_with(
         ANY,
         data=ANY,
-        params={
-            "client_id": "verify-client-id",
-            "redirect_uri": "https://example.com",
-        },
+        params={"client_id": "verify-client-id", "redirect_uri": "https://example.com"},
         headers=ANY,
         timeout=60,
     )