diff --git a/pyproject.toml b/pyproject.toml
index 3819aee..6361aea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ readme = "README.md"
 requires-python = ">=3.11"
 dependencies = [
   "pydantic>=2,<3",
-  "tzdata>=2025.2",
+  "tzdata>=2026.3",
 ]
 
 [project.optional-dependencies]
diff --git a/uv.lock b/uv.lock
index ab7d8b3..26571ba 100644
--- a/uv.lock
+++ b/uv.lock
@@ -938,7 +938,7 @@ requires-dist = [
     { name = "psycopg", extras = ["binary"], marker = "extra == 'postgres'", specifier = ">=3.3.4,<4" },
     { name = "pydantic", specifier = ">=2,<3" },
     { name = "pytest", marker = "extra == 'test'", specifier = ">=9.1.1" },
-    { name = "tzdata", specifier = ">=2025.2" },
+    { name = "tzdata", specifier = ">=2026.3" },
     { name = "uvicorn", extras = ["standard"], marker = "extra == 'api'", specifier = ">=0.51.0" },
 ]
 provides-extras = ["api", "test", "postgres"]