diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 09a19e8..83cf910 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -5,6 +5,6 @@ sphinx:
 formats:
   - pdf
 python:
-  version: 3.9
+  version: 3.8
   install:
   - requirements: docs/requirements.txt