diff --git a/.readthedocs.yml b/.readthedocs.yml
index cb3228d..9c82e83 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,6 +6,8 @@ version: 2
 
 build:
   os: ubuntu-20.04
+  tools:
+    python: "3.6"
 
 sphinx:
   builder: html
@@ -15,7 +17,6 @@ sphinx:
 formats: []
 
 python:
-  version: 3.6
   install:
     - requirements: doc/requirements.txt
     - method: pip