diff --git a/dropbox/session.py b/dropbox/session.py
index fe0c7b23..7092f2ae 100644
--- a/dropbox/session.py
+++ b/dropbox/session.py
@@ -41,7 +41,6 @@ def init_poolmanager(self, connections, maxsize, block=False, **_):
             block=block,
             cert_reqs=ssl.CERT_REQUIRED,
             ca_certs=_TRUSTED_CERT_FILE,
-            ssl_version=ssl.PROTOCOL_TLSv1,
         )
 
 def pinned_session(pool_maxsize=8):