diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 7a9f02a..dae5e42 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -27,4 +27,3 @@ repos:
         additional_dependencies:
           - "pydantic==2.6.3"
           - "fastapi==0.110.0"
-          - "types-pytz==2024.1.0.20240203"
diff --git a/pyproject.toml b/pyproject.toml
index 163b187..fcd2ed5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,8 @@ requires-python = ">=3.11"
 dependencies = [
     "fastapi==0.110.0",
     "uvicorn[standard]==0.27.1",
-    "pylunar==0.7.2"
+    "pylunar==0.7.2",
+    "tzdata==2024.1"
 ]
 
 [project.urls]
diff --git a/src/lct_web/models/dateloc.py b/src/lct_web/models/dateloc.py
index 6c3e9b3..d675e46 100644
--- a/src/lct_web/models/dateloc.py
+++ b/src/lct_web/models/dateloc.py
@@ -13,11 +13,10 @@
 from __future__ import annotations
 
 from math import fabs
+import zoneinfo
 
 from fastapi import Query
 from pydantic import BaseModel, field_validator
-import pytz
-from pytz.exceptions import UnknownTimeZoneError
 
 __all__ = ["DateLoc"]
 
@@ -37,7 +36,7 @@ class DateLoc(BaseModel):
     def check_timezone(cls, tz: str) -> str:
         """Check for timezone name."""
         try:
-            pytz.timezone(tz)
-        except UnknownTimeZoneError:
+            zoneinfo.ZoneInfo(tz)
+        except zoneinfo.ZoneInfoNotFoundError:
             raise ValueError(f"Unknown timezone {tz}") from None
         return tz