diff --git a/.readthedocs.yml b/.readthedocs.yml
index 4112d0cb..d3865001 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -3,6 +3,10 @@
 
 version: 2
 
+# the build.os and build.tools section is mandatory
+build:
+  os: ubuntu-22.04
+
 sphinx:
   configuration: doc/source/conf.py