diff --git a/monkey/infection_monkey/requirements.txt b/monkey/infection_monkey/requirements.txt
index b81018d95..0a1dbd282 100644
--- a/monkey/infection_monkey/requirements.txt
+++ b/monkey/infection_monkey/requirements.txt
@@ -13,6 +13,5 @@ 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'
diff --git a/monkey/infection_monkey/telemetry/tests/test_post_breach_telem.py b/monkey/infection_monkey/telemetry/tests/test_post_breach_telem.py
index e6cbc45b2..d38cfdbde 100644
--- a/monkey/infection_monkey/telemetry/tests/test_post_breach_telem.py
+++ b/monkey/infection_monkey/telemetry/tests/test_post_breach_telem.py
@@ -11,11 +11,8 @@ RESULT = False
 
 
 @pytest.fixture
-def post_breach_telem_test_instance(mocker):
-    mocker.patch(
-        "infection_monkey.telemetry.post_breach_telem.PostBreachTelem._get_hostname_and_ip",
-        return_value=(HOSTNAME, IP),
-    )
+def post_breach_telem_test_instance(monkeypatch):
+    monkeypatch.setattr(PostBreachTelem, "_get_hostname_and_ip", lambda: (HOSTNAME, IP))
     return PostBreachTelem(PBA, RESULT)