diff --git a/README.md b/README.md
index 3216d66..39c6102 100644
--- a/README.md
+++ b/README.md
@@ -587,7 +587,7 @@ Establishing explicit contexts within an application will override these environ
 - `OPENSHIFT_CLIENT_PYTHON_DEFAULT_OC_PATH` - default path to use when invoking `oc`
 - `OPENSHIFT_CLIENT_PYTHON_DEFAULT_CONFIG_PATH` - default `--kubeconfig` argument
 - `OPENSHIFT_CLIENT_PYTHON_DEFAULT_API_SERVER` - default `--server` argument
-- `OPENSHIFT_CLIENT_PYTHON_DEFAULT_CA_CERT_PATH` - default `--cacert` argument
+- `OPENSHIFT_CLIENT_PYTHON_DEFAULT_CA_CERT_PATH` - default `--certificate-authority` argument
 - `OPENSHIFT_CLIENT_PYTHON_DEFAULT_PROJECT` - default `--namespace` argument
 - `OPENSHIFT_CLIENT_PYTHON_DEFAULT_OC_LOGLEVEL` - default `--loglevel` argument
 - `OPENSHIFT_CLIENT_PYTHON_DEFAULT_SKIP_TLS_VERIFY` - default `--insecure-skip-tls-verify`
diff --git a/packages/openshift_client/action.py b/packages/openshift_client/action.py
index ae37d6e..8e55d27 100644
--- a/packages/openshift_client/action.py
+++ b/packages/openshift_client/action.py
@@ -246,7 +246,7 @@ def oc_action(context, verb, cmd_args=None, all_namespaces=False, no_namespace=F
         cmds.append('--token={}'.format(context.get_token()))
 
     if context.get_ca_cert_path() is not None:
-        cmds.append('--cacert={}'.format(context.get_ca_cert_path()))
+        cmds.append('--certificate-authority={}'.format(context.get_ca_cert_path()))
 
     if all_namespaces:
         cmds.append("--all-namespaces")