diff --git a/.readthedocs.yml b/.readthedocs.yml
index 527e52d1..389ac4a1 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -2,3 +2,6 @@ version: 2
 
 conda:
   environment: environment.yml
+build:
+  tools:
+    python: mambaforge-4.10