diff --git a/build.py b/build.py
index 0bf02b2..a4f0ad3 100755
--- a/build.py
+++ b/build.py
@@ -7,10 +7,8 @@ import json
 import os
 import sys
 import typing
-from collections import Counter
-from datetime import date, datetime, timedelta
+from datetime import datetime, timezone
 
-import pytz
 import requests
 
 config = configparser.ConfigParser()
@@ -70,7 +68,7 @@ def parse_date(date_str: str | None) -> datetime | None:
         return None
 
     fmt = "%Y-%m-%dT%H:%M:%SZ" if date_str.endswith("Z") else "%Y-%m-%dT%H:%M:%S%z"
-    return datetime.strptime(date_str, fmt).astimezone(pytz.utc)
+    return datetime.strptime(date_str, fmt).astimezone(timezone.utc)
 
 
 def count_open_bugs(bug_reports: list[Bug]) -> list[tuple[str, int]]: