diff --git a/homeassistant/generated/bluetooth.py b/homeassistant/generated/bluetooth.py
index 3c18c27057a..03b40ad258f 100644
--- a/homeassistant/generated/bluetooth.py
+++ b/homeassistant/generated/bluetooth.py
@@ -5,7 +5,9 @@ To update, run python3 -m script.hassfest
 
 from __future__ import annotations
 
-BLUETOOTH: list[dict[str, bool | str | int | list[int]]] = [
+from typing import Final
+
+BLUETOOTH: Final[list[dict[str, bool | str | int | list[int]]]] = [
     {
         "domain": "airthings_ble",
         "manufacturer_id": 820,
diff --git a/homeassistant/generated/countries.py b/homeassistant/generated/countries.py
index 452e65afb02..c3c912c4882 100644
--- a/homeassistant/generated/countries.py
+++ b/homeassistant/generated/countries.py
@@ -7,7 +7,11 @@ to the political situation in the world, please contact the ISO 3166 working gro
 
 """
 
-COUNTRIES = {
+from __future__ import annotations
+
+from typing import Final
+
+COUNTRIES: Final[set[str]] = {
     "AD",
     "AE",
     "AF",
diff --git a/homeassistant/generated/dhcp.py b/homeassistant/generated/dhcp.py
index 9c5d25a7f22..3b5fe9843f2 100644
--- a/homeassistant/generated/dhcp.py
+++ b/homeassistant/generated/dhcp.py
@@ -5,7 +5,9 @@ To update, run python3 -m script.hassfest
 
 from __future__ import annotations
 
-DHCP: list[dict[str, str | bool]] = [
+from typing import Final
+
+DHCP: Final[list[dict[str, str | bool]]] = [
     {
         "domain": "airzone",
         "macaddress": "E84F25*",
diff --git a/script/countries.py b/script/countries.py
index d67caa4da65..b6ec99c9e28 100644
--- a/script/countries.py
+++ b/script/countries.py
@@ -24,5 +24,6 @@ Path("homeassistant/generated/countries.py").write_text(
             "COUNTRIES": countries,
         },
         generator=generator_string,
+        annotations={"COUNTRIES": "Final[set[str]]"},
     )
 )
diff --git a/script/hassfest/bluetooth.py b/script/hassfest/bluetooth.py
index d724905f9cd..49480d1ed02 100644
--- a/script/hassfest/bluetooth.py
+++ b/script/hassfest/bluetooth.py
@@ -20,7 +20,9 @@ def generate_and_validate(integrations: dict[str, Integration]) -> str:
 
     return format_python_namespace(
         {"BLUETOOTH": match_list},
-        annotations={"BLUETOOTH": "list[dict[str, bool | str | int | list[int]]]"},
+        annotations={
+            "BLUETOOTH": "Final[list[dict[str, bool | str | int | list[int]]]]"
+        },
     )
 
 
diff --git a/script/hassfest/dhcp.py b/script/hassfest/dhcp.py
index 67543a772fc..d1fd0474430 100644
--- a/script/hassfest/dhcp.py
+++ b/script/hassfest/dhcp.py
@@ -20,7 +20,7 @@ def generate_and_validate(integrations: dict[str, Integration]) -> str:
 
     return format_python_namespace(
         {"DHCP": match_list},
-        annotations={"DHCP": "list[dict[str, str | bool]]"},
+        annotations={"DHCP": "Final[list[dict[str, str | bool]]]"},
     )
 
 
diff --git a/script/hassfest/serializer.py b/script/hassfest/serializer.py
index 1de4c48a0c4..d81a0621ecb 100644
--- a/script/hassfest/serializer.py
+++ b/script/hassfest/serializer.py
@@ -102,6 +102,6 @@ def format_python_namespace(
         for key, value in sorted(content.items())
     )
     if annotations:
-        # If we had any annotations, add the __future__ import.
-        code = f"from __future__ import annotations\n{code}"
+        # If we had any annotations, add __future__ and typing imports.
+        code = f"from __future__ import annotations\n\nfrom typing import Final\n{code}"
     return format_python(code, generator=generator)