diff --git a/pyproject.toml b/pyproject.toml
index 48f32fb..1619c8e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ dependencies = [
   'parsedatetime<=2.6',
   'pydantic==2.9.2',  # Pin to specific working version
   'pydantic_core==2.23.4',  # Pin to specific working version  
-  'python-dateutil<=2.8.2',
+  'python-dateutil<=2.9.0.post0',
   'redis<=4.3.4',
   # selenium 4.0 breaks with arm geckodriver.
   'selenium==3.141.0',