diff --git a/.strict-typing b/.strict-typing
index 598f2bc1f6d..fcb8552bd8b 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -58,6 +58,7 @@ homeassistant.components.amcrest.*
 homeassistant.components.ampio.*
 homeassistant.components.analytics.*
 homeassistant.components.anthemav.*
+homeassistant.components.apcupsd.*
 homeassistant.components.aqualogic.*
 homeassistant.components.aseko_pool_live.*
 homeassistant.components.asuswrt.*
diff --git a/homeassistant/components/apcupsd/__init__.py b/homeassistant/components/apcupsd/__init__.py
index e7088a09101..3fb8bf00b8a 100644
--- a/homeassistant/components/apcupsd/__init__.py
+++ b/homeassistant/components/apcupsd/__init__.py
@@ -62,7 +62,7 @@ class APCUPSdData:
         """Initialize the data object."""
         self._host = host
         self._port = port
-        self.status: dict[str, Any] = {}
+        self.status: dict[str, str] = {}
 
     @property
     def name(self) -> str | None:
@@ -100,7 +100,7 @@ class APCUPSdData:
         return self.status.get("STATFLAG")
 
     @Throttle(MIN_TIME_BETWEEN_UPDATES)
-    def update(self, **kwargs):
+    def update(self, **kwargs: Any) -> None:
         """Fetch the latest status from APCUPSd.
 
         Note that the result dict uses upper case for each resource, where our
diff --git a/homeassistant/components/apcupsd/sensor.py b/homeassistant/components/apcupsd/sensor.py
index 2bc38b1d50c..845e482d12c 100644
--- a/homeassistant/components/apcupsd/sensor.py
+++ b/homeassistant/components/apcupsd/sensor.py
@@ -465,7 +465,7 @@ async def async_setup_entry(
     async_add_entities(entities, update_before_add=True)
 
 
-def infer_unit(value):
+def infer_unit(value: str) -> tuple[str, str | None]:
     """If the value ends with any of the units from ALL_UNITS.
 
     Split the unit off the end of the value and return the value, unit tuple
diff --git a/mypy.ini b/mypy.ini
index 2e0c5d2ae0d..40f523a2811 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -333,6 +333,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.apcupsd.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.aqualogic.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true