diff --git a/azure-keyvault/azure/keyvault/custom/key_vault_authentication.py b/azure-keyvault/azure/keyvault/custom/key_vault_authentication.py
index <HASH>..<HASH> 100644
--- a/azure-keyvault/azure/keyvault/custom/key_vault_authentication.py
+++ b/azure-keyvault/azure/keyvault/custom/key_vault_authentication.py
@@ -31,7 +31,7 @@ class KeyVaultAuthBase(AuthBase):
                 # send the request to retrieve the challenge, then request the token and update
                 # the request
                 # TODO: wire up commons flag for things like Fiddler, logging, etc.
-                response = requests.Session().send(request, verify=os.environ.get('REQUESTS_CA_BUNDLE') or os.environ.get('CURL_CA_BUNDLE'))
+                response = requests.Session().send(request)
                 if response.status_code == 401:
                     auth_header = response.headers['WWW-Authenticate']
                     if HttpBearerChallenge.is_bearer_challenge(auth_header):
reverting changes to KeyVaultAuthBase