diff --git a/requirements.txt b/requirements.txt
index b99fc7d6..098f4ed0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,7 @@
 nose2>=0.9.2
 nose2[coverage_plugin]>=0.6.5
 pylint>=2.6.0
+cryptography~=3.3.1
 pyopenssl>=20.0.0
 PyInstaller>=4.0
 PyYAML>=5.3.1