diff --git a/readthedocs.yml b/readthedocs.yml
index a35c9ce..12aca18 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -1,15 +1,10 @@
-# Required
 version: 2
-
-# Conda env
 conda:
   environment: ci/environment-docs.yml
-
-# Set the OS, Python version and other tools you might need
 build:
-  os: ubuntu-22.04
+  os: 'ubuntu-20.04'
   tools:
-    python: '3.11'
+    python: 'mambaforge-4.10'
 
 # Build documentation in the "docs/" directory with Sphinx
 sphinx: