diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 6c1bada..f076753 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,7 +1,7 @@
 version: 2
 
 python:
-  version: 3.9
+  version: 3.8
   install:
   - requirements: requirements.txt
   - requirements: requirements-dev.txt