diff --git a/requirements.txt b/requirements.txt
index 2b23b60a..bf6d4bfd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ platformdirs==4.13.5 ; python_version >= "3.12" and python_version < "4"
 pygments==2.21.0 ; python_version >= "3.12" and python_version < "4"
 pymdown-extensions==12.3 ; python_version >= "3.12" and python_version < "4"
 pyparsing==3.3.3 ; python_version >= "3.12" and python_version < "4"
-python-dateutil==2.9.0.post0 ; python_version >= "3.12" and python_version < "4"
+python-dateutil==3.0.0 ; python_version >= "3.12" and python_version < "4"
 python-markdown-math==0.9 ; python_version >= "3.12" and python_version < "4"
 pytz==2026.5 ; python_version >= "3.12" and python_version < "4"
 pyyaml-env-tag==1.1 ; python_version >= "3.12" and python_version < "4"