diff --git a/tests/test_ssh.py b/tests/test_ssh.py
index 48aab95..07e183b 100644
--- a/tests/test_ssh.py
+++ b/tests/test_ssh.py
@@ -30,6 +30,7 @@ def jupyter_server(random_port):
     ]
     env = os.environ.copy()
     with tempfile.TemporaryDirectory() as temp_dir:
+        os.chmod(temp_dir, 0o700)
         authorized_keys_path = os.path.join(temp_dir, 'authorized_keys')
         subprocess.check_call(['ssh-keygen', '-f', authorized_keys_path, '-q', '-N', ''])