diff --git a/pyproject.toml b/pyproject.toml
index b5ab039..2bba5c4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ dependencies = [
     "tweepy==4.16.0",
     "typing-extensions==4.15.0",
     "typing-inspection==0.4.2",
-    "tzdata==2025.3",
+    "tzdata==2026.1",
     "urllib3==2.6.3",
     "uvicorn==0.43.0",
     "jinja2==3.1.6",