diff --git a/setup.py b/setup.py
index bc1516ee..c2406240 100755
--- a/setup.py
+++ b/setup.py
@@ -94,7 +94,8 @@ setup(
     cmdclass={'test': PyTest},
     tests_require=test_requirements,
     extras_require={
-        'security': ['pyOpenSSL>=0.13', 'ndg-httpsclient', 'pyasn1'],
+        'security': ['pyOpenSSL>=0.14', 'cryptography>=1.3.4', 'idna>=2.0.0'],
         'socks': ['PySocks>=1.5.6, !=1.5.7'],
     },
 )
+