diff --git a/.readthedocs.yml b/.readthedocs.yml
index 5a4806c9..d9558bb9 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,7 +1,9 @@
 version: 2
 
 build:
-    image: stable
+    os: "ubuntu-20.04"
+    tools:
+      python: "mambaforge-4.10"
 
 formats:
     - pdf