diff --git a/monkey/monkey_island/requirements.txt b/monkey/monkey_island/requirements.txt
index 88af6bad0..08049006b 100644
--- a/monkey/monkey_island/requirements.txt
+++ b/monkey/monkey_island/requirements.txt
@@ -11,7 +11,7 @@ flask>=1.1
 ipaddress>=1.0.23
 jsonschema==3.2.0
 mongoengine>=0.20
-mongomock>=3.19
+mongomock==3.19.0
 netifaces>=0.10.9
 pycryptodome==3.9.8
 pytest>=5.4