diff --git a/requirements-dev.txt b/requirements-dev.txt
index 69cedcc1..62d6e107 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -108,7 +108,7 @@ tomlkit==0.13.2 ; python_version >= '3.7'
 
 trio==0.26.2
 
-types-python-dateutil==2.9.0.20240316
+types-python-dateutil==2.9.0.20240821
 
 types-requests==2.32.0.20240712; python_version >= '3.7'
 urllib3==2.2.2 ; python_version >= '3.7'