diff --git a/dev-requirements.txt b/dev-requirements.txt
index 286e4b2..ff4c114 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -216,7 +216,7 @@ text-unidecode==1.3
     # via coldfront
 toml==0.10.2
     # via django-stubs
-types-python-dateutil==2.8.19.20240106
+types-python-dateutil==2.9.0.20241003
     # via
     #   arrow
     #   coldfront
diff --git a/doc-requirements.txt b/doc-requirements.txt
index e03434f..e2d936d 100644
--- a/doc-requirements.txt
+++ b/doc-requirements.txt
@@ -237,7 +237,7 @@ sqlparse==0.4.4
     #   django
 text-unidecode==1.3
     # via coldfront
-types-python-dateutil==2.8.19.20240106
+types-python-dateutil==2.9.0.20241003
     # via
     #   arrow
     #   coldfront
diff --git a/requirements.txt b/requirements.txt
index ed99f8a..1e22fe4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -145,7 +145,7 @@ sqlparse==0.4.4
     #   django
 text-unidecode==1.3
     # via coldfront
-types-python-dateutil==2.8.19.20240106
+types-python-dateutil==2.9.0.20241003
     # via
     #   arrow
     #   coldfront