diff --git a/homeassistant/components/prosegur/alarm_control_panel.py b/homeassistant/components/prosegur/alarm_control_panel.py
index e7176b241e5..133c182e2cc 100644
--- a/homeassistant/components/prosegur/alarm_control_panel.py
+++ b/homeassistant/components/prosegur/alarm_control_panel.py
@@ -1,4 +1,6 @@
 """Support for Prosegur alarm control panels."""
+from __future__ import annotations
+
 import logging
 
 from pyprosegur.auth import Auth
@@ -44,12 +46,12 @@ class ProsegurAlarm(alarm.AlarmControlPanelEntity):
         AlarmControlPanelEntityFeature.ARM_AWAY
         | AlarmControlPanelEntityFeature.ARM_HOME
     )
+    _installation: Installation
 
     def __init__(self, contract: str, auth: Auth) -> None:
         """Initialize the Prosegur alarm panel."""
         self._changed_by = None
 
-        self._installation = None
         self.contract = contract
         self._auth = auth
 
@@ -57,7 +59,7 @@ class ProsegurAlarm(alarm.AlarmControlPanelEntity):
         self._attr_name = f"contract {self.contract}"
         self._attr_unique_id = self.contract
 
-    async def async_update(self):
+    async def async_update(self) -> None:
         """Update alarm status."""
 
         try:
@@ -70,14 +72,14 @@ class ProsegurAlarm(alarm.AlarmControlPanelEntity):
         self._attr_state = STATE_MAPPING.get(self._installation.status)
         self._attr_available = True
 
-    async def async_alarm_disarm(self, code=None):
+    async def async_alarm_disarm(self, code: str | None = None) -> None:
         """Send disarm command."""
         await self._installation.disarm(self._auth)
 
-    async def async_alarm_arm_home(self, code=None):
+    async def async_alarm_arm_home(self, code: str | None = None) -> None:
         """Send arm away command."""
         await self._installation.arm_partially(self._auth)
 
-    async def async_alarm_arm_away(self, code=None):
+    async def async_alarm_arm_away(self, code: str | None = None) -> None:
         """Send arm away command."""
         await self._installation.arm(self._auth)