diff --git a/readthedocs.yml b/readthedocs.yml
index 32bcf1f..1506503 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -1,6 +1,6 @@
 version: 2
 python:
-  version: 3.9
+  version: 3.8
   install:
     - requirements: docs/requirements.txt
     - method: setuptools