diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 4296ead..713b2f2 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -7,9 +7,9 @@ version: 2
 
 # Set the OS, Python version and other tools you might need
 build:
-  os: ubuntu-latest
+  os: 'ubuntu-20.04'
   tools:
-    python: "3.x"
+    python: "3.11"
 
 # Build documentation in the "docs/" directory with Sphinx
 sphinx: