diff --git a/pyproject.toml b/pyproject.toml
index 769c5b16..3a86b151 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ dev = [
     "pytest-asyncio==1.3.0",
     "types-certifi==2021.10.8.3",
     "types-chardet==5.0.4.6",
-    "types-python-dateutil==2.9.0.20260323",
+    "types-python-dateutil==2.9.0.20260402",
     "types-PyYAML==6.0.12.20250915",
     "ruff==0.15.8",
     "types-ujson==5.10.0.20250822",
diff --git a/uv.lock b/uv.lock
index 4e25cc2c..e5e64fdf 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1588,7 +1588,7 @@ dev = [
     { name = "ty", specifier = "==0.0.27" },
     { name = "types-certifi", specifier = "==2021.10.8.3" },
     { name = "types-chardet", specifier = "==5.0.4.6" },
-    { name = "types-python-dateutil", specifier = "==2.9.0.20260323" },
+    { name = "types-python-dateutil", specifier = "==2.9.0.20260402" },
     { name = "types-pyyaml", specifier = "==6.0.12.20250915" },
     { name = "types-ujson", specifier = "==5.10.0.20250822" },
     { name = "wheel", specifier = "==0.46.3" },
@@ -1653,11 +1653,11 @@ wheels = [
 
 [[package]]
 name = "types-python-dateutil"
-version = "2.9.0.20260323"
+version = "2.9.0.20260402"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/e9/02/f72df9ef5ffc4f959b83cb80c8aa03eb8718a43e563ecd99ccffe265fa89/types_python_dateutil-2.9.0.20260323.tar.gz", hash = "sha256:a107aef5841db41ace381dbbbd7e4945220fc940f7a72172a0be5a92d9ab7164", size = 16897, upload-time = "2026-03-23T04:15:14.829Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/a7/30/c5d9efbff5422b20c9551dc5af237d1ab0c3d33729a9b3239a876ca47dd4/types_python_dateutil-2.9.0.20260402.tar.gz", hash = "sha256:a980142b9966713acb382c467e35c5cc4208a2f91b10b8d785a0ae6765df6c0b", size = 16941, upload-time = "2026-04-02T04:18:35.834Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/92/c1/b661838b97453e699a215451f2e22cee750eaaf4ea4619b34bdaf01221a4/types_python_dateutil-2.9.0.20260323-py3-none-any.whl", hash = "sha256:a23a50a07f6eb87e729d4cb0c2eb511c81761eeb3f505db2c1413be94aae8335", size = 18433, upload-time = "2026-03-23T04:15:13.683Z" },
+    { url = "https://files.pythonhosted.org/packages/e6/d7/fe753bf8329c8c3c1addcba1d2bf716c33898216757abb24f8b80f82d040/types_python_dateutil-2.9.0.20260402-py3-none-any.whl", hash = "sha256:7827e6a9c93587cc18e766944254d1351a2396262e4abe1510cbbd7601c5e01f", size = 18436, upload-time = "2026-04-02T04:18:34.806Z" },
 ]
 
 [[package]]