diff --git a/.readthedocs.yml b/.readthedocs.yml
index 274e33d..ef77a3f 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -5,10 +5,16 @@ version: 2
 sphinx:
   configuration: docs/conf.py
 
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.9"
+
+
+
 formats: all
 
 python:
-  version: 3.8
   install:
     - requirements: requirements.txt
     - requirements: test-requirements.txt