diff --git a/tests/test_backend.py b/tests/test_backend.py
index e2084df..53d29d9 100644
--- a/tests/test_backend.py
+++ b/tests/test_backend.py
@@ -7,7 +7,7 @@
 
 from pathlib import Path
 from unittest.mock import Mock, patch
-from ssl import SSLError
+from ssl import SSLContext, SSLError, PROTOCOL_TLS_CLIENT
 from smtplib import SMTP, SMTPException
 from email import message_from_binary_file, message_from_bytes
 from io import StringIO
@@ -343,8 +343,12 @@ def test_email_tls_attempts_starttls(self):
                     pass
 
     def test_email_ssl_attempts_ssl_connection(self):
-        with SmtpdContext(self.app.extensions['mailman']):
+        mailman = self.app.extensions['mailman']
+        with SmtpdContext(mailman):
             self.app.extensions['mailman'].use_ssl = True
+            self.app.extensions['mailman'].context = SSLContext(
+                PROTOCOL_TLS_CLIENT,
+            )
             backend = smtp.EmailBackend()
             self.assertTrue(backend.use_ssl)
             with self.assertRaises(SSLError):