---
 requests_toolbelt/adapters/x509.py |   27 ++++-----------------------
 1 file changed, 4 insertions(+), 23 deletions(-)

--- a/requests_toolbelt/adapters/x509.py
+++ b/requests_toolbelt/adapters/x509.py
@@ -8,6 +8,7 @@ X.509 certificate without needing to con
 """
 
 from OpenSSL.crypto import PKey, X509
+from OpenSSL.SSL import Context, TLS_CLIENT_METHOD
 from cryptography import x509
 from cryptography.hazmat.primitives.serialization import (load_pem_private_key,
                                                           load_der_private_key)
@@ -20,16 +21,6 @@ import requests
 
 from .. import exceptions as exc
 
-"""
-importing the protocol constants from _ssl instead of ssl because only the
-constants are needed and to handle issues caused by importing from ssl on
-the 2.7.x line.
-"""
-try:
-    from _ssl import PROTOCOL_TLS as PROTOCOL
-except ImportError:
-    from _ssl import PROTOCOL_SSLv23 as PROTOCOL
-
 
 PyOpenSSLContext = None
 
@@ -84,7 +75,6 @@ class X509Adapter(HTTPAdapter):
 
     def __init__(self, *args, **kwargs):
         self._import_pyopensslcontext()
-        self._check_version()
         cert_bytes = kwargs.pop('cert_bytes', None)
         pk_bytes = kwargs.pop('pk_bytes', None)
         password = kwargs.pop('password', None)
@@ -136,15 +126,6 @@ class X509Adapter(HTTPAdapter):
                 except ImportError:
                     PyOpenSSLContext = None
 
-    def _check_version(self):
-        if PyOpenSSLContext is None:
-            raise exc.VersionMismatchError(
-                "The X509Adapter requires at least Requests 2.12.0 to be "
-                "installed. Version {} was found instead.".format(
-                    requests.__version__
-                )
-            )
-
 
 def check_cert_dates(cert):
     """Verify that the supplied client cert is not invalid."""
@@ -190,7 +171,7 @@ def create_ssl_context(cert_byes, pk_byt
         raise ValueError('Cert and key could not be parsed from '
                          'provided data')
     check_cert_dates(cert)
-    ssl_context = PyOpenSSLContext(PROTOCOL)
-    ssl_context._ctx.use_certificate(X509.from_cryptography(cert))
-    ssl_context._ctx.use_privatekey(PKey.from_cryptography_key(key))
+    ssl_context = Context(TLS_CLIENT_METHOD)
+    ssl_context.use_certificate(X509.from_cryptography(cert))
+    ssl_context.use_privatekey(PKey.from_cryptography_key(key))
     return ssl_context