diff --git a/monkey/infection_monkey/requirements.txt b/monkey/infection_monkey/requirements.txt
index 0a1dbd282..b81018d95 100644
--- a/monkey/infection_monkey/requirements.txt
+++ b/monkey/infection_monkey/requirements.txt
@@ -13,5 +13,6 @@ pyftpdlib==1.5.6
 pymssql<3.0
 pypykatz==0.3.12
 pysmb==1.2.5
+pytest-mock==3.5.1
 requests>=2.24
 wmi==1.5.1 ; sys_platform == 'win32'