diff --git a/pyproject.toml b/pyproject.toml
index fb53951..787f0b4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ dependencies = [
     "pyyaml>=6.0",
     "pydantic>=2.0",
     "pydantic-settings>=2.0",
-    "tzdata>=2025.2",
+    "tzdata>=2026.3",
 ]
 
 [project.optional-dependencies]