diff --git a/monkey/infection_monkey/requirements.txt b/monkey/infection_monkey/requirements.txt
index 0a1dbd282..dc0ab227e 100644
--- a/monkey/infection_monkey/requirements.txt
+++ b/monkey/infection_monkey/requirements.txt
@@ -1,3 +1,4 @@
+cryptography==2.5
 WinSys-3.x>=0.5.2
 cffi>=1.14
 ecdsa==0.15