diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 61926ae..ccc3630 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -10,3 +10,10 @@ repos:
       - id: ruff
         args: [--fix]
       - id: ruff-format
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v1.10.0
+    hooks:
+      - id: mypy
+        args: [--disable-error-code=import-untyped]
+        additional_dependencies:
+          [anyio, attrs, httpx, loguru, python-dateutil, tenacity]
diff --git a/main.py b/main.py
index 82eeea4..78a2a85 100644
--- a/main.py
+++ b/main.py
@@ -6,7 +6,7 @@
 from asyncio import CancelledError
 from collections.abc import Callable, Iterable, Sequence
 from itertools import product
-from typing import Literal, Self
+from typing import Literal, Self, TypeAlias
 
 import httpx
 from anyio import create_task_group, run, sleep
@@ -28,7 +28,8 @@
 from flights import Availability
 from utils import beep, httpx_client, pretty_printer
 
-type DiffLine = tuple[Literal[" ", "+", "-"], Availability]
+# TODO(https://github.com/python/mypy/issues/15238): Switch back to PEP 695 type alias when supported by mypy
+DiffLine: TypeAlias = tuple[Literal[" ", "+", "-"], Availability]
 
 
 @frozen