diff --git a/setup.py b/setup.py
index 0a19dccf95..409c5a872e 100755
--- a/setup.py
+++ b/setup.py
@@ -33,6 +33,7 @@ REQUIRES = [
     'pytz==2020.1',
     'pyserial==3.4',
     'ifaddr==0.1.6',
+    'cryptography==2.9.2',
 ]
 
 # If you have problems importing platformio and esptool as modules you can set