diff --git a/python/packages/durabletask/pyproject.toml b/python/packages/durabletask/pyproject.toml
index 40c2dd8f35..5a4b8d4ae1 100644
--- a/python/packages/durabletask/pyproject.toml
+++ b/python/packages/durabletask/pyproject.toml
@@ -30,7 +30,7 @@ dependencies = [
 
 [dependency-groups]
 dev = [
-    "types-python-dateutil==2.9.0.20260518",
+    "types-python-dateutil==2.9.0.20260716",
 ]
 
 [tool.uv]
diff --git a/python/uv.lock b/python/uv.lock
index a0068be040..e32caf6951 100644
--- a/python/uv.lock
+++ b/python/uv.lock
@@ -551,7 +551,7 @@ requires-dist = [
 ]
 
 [package.metadata.requires-dev]
-dev = [{ name = "types-python-dateutil", specifier = "==2.9.0.20260518" }]
+dev = [{ name = "types-python-dateutil", specifier = "==2.9.0.20260716" }]
 
 [[package]]
 name = "agent-framework-foundry"
@@ -8194,11 +8194,11 @@ wheels = [
 
 [[package]]
 name = "types-python-dateutil"
-version = "2.9.0.20260518"
+version = "2.9.0.20260716"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/8d/e8/c01bdf0d7c3659428c091fbd693177093639565bcbc86bc20098e6d37cc6/types_python_dateutil-2.9.0.20260518.tar.gz", hash = "sha256:51f02dc03b61c7f6a07df45797d4dfe8a1aa47f0b7db9ad89f6fd3a1a70e1b51", size = 17082, upload-time = "2026-05-18T06:05:24.508Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/df/9a/aefb9f80ff79641d36149352afe66ca835c5e6894deb518418f786f4b8ad/types_python_dateutil-2.9.0.20260716.tar.gz", hash = "sha256:1d55d1c3024bdb4861bb6a6622c9ec800c433d87bdc5b16fb84cdd0eed4ef2cb", size = 17516, upload-time = "2026-07-16T04:48:06.604Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/36/22/169273273ca34e9ab0ae2f387ba72ed7e09faaaf834da01d6b89c2bea71a/types_python_dateutil-2.9.0.20260518-py3-none-any.whl", hash = "sha256:d6a9c5bd0de61460c8fdef8ab2b400f956a1a1075cce08d4e2b4434e478c50b8", size = 18431, upload-time = "2026-05-18T06:05:23.641Z" },
+    { url = "https://files.pythonhosted.org/packages/16/85/cff97326a81e7e8877803e78e3ea56c840b85bb811934b9c936f7c40f185/types_python_dateutil-2.9.0.20260716-py3-none-any.whl", hash = "sha256:1ae41d51a5c5f6bbeeb7f1f34df7086d55ff1605cf88d2ed71a7a276e1a7794e", size = 18443, upload-time = "2026-07-16T04:48:05.793Z" },
 ]
 
 [[package]]