diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 22e9c376..b9c0b318 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -3,9 +3,11 @@
 # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
 
 version: 2
-
+build:
+  os: ubuntu-22.04 # required
+  tools:
+    python: mambaforge-4.10
 mkdocs:
   configuration: mkdocs.yaml
-
 conda:
   environment: envs/docs.yaml