diff --git a/src/keycloak/connection.py b/src/keycloak/connection.py
index f7b8ffd..a709713 100644
--- a/src/keycloak/connection.py
+++ b/src/keycloak/connection.py
@@ -102,7 +102,7 @@ class ConnectionManager(object):
         if proxies:
             self._s.proxies.update(proxies)
 
-        self.async_s = httpx.AsyncClient(verify=verify, proxies=proxies, cert=cert)
+        self.async_s = httpx.AsyncClient(verify=verify, mounts=proxies, cert=cert)
         self.async_s.auth = None  # don't let requests add auth headers
         self.async_s.transport = httpx.AsyncHTTPTransport(retries=1)