diff --git a/.readthedocs.yml b/.readthedocs.yml
index e446df4..07d1490 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -18,6 +18,6 @@ formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.6
+  version: 3.9
   install:
     - requirements: docs/requirements.txt