ReadTheDocs only supports up to Python 3.8.

anthony-tuininga · anthony-tuininga · commit 3a40eeacaa1b · 2021-11-04T15:58:51.000-06:00
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
@@ -4,6 +4,6 @@ sphinx:
   configuration: doc/src/conf.py
 
 python:
-  version: 3.9
+  version: 3.8
   install:
     - requirements: doc/requirements.txt
