diff --git a/docs/source/conf.py b/docs/source/conf.py
index b66ee0a8d9e53b64ae75e66d7b9ad8e98ece636b..48b40e921dbb72df8f82c3604f36a250bd557c14 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -82,10 +82,7 @@ templates_path = ['_templates']
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path.
-
-# Disable specific typing until build server supports python 3.9
-# exclude_patterns: list[str] = []
-exclude_patterns = []
+exclude_patterns: List[str] = []
 
 
 # -- Options for HTML output -------------------------------------------------