diff --git a/.readthedocs.yml b/.readthedocs.yml
index ce5883751..d23a95276 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,7 +6,7 @@
 version: 2
 
 build:
-  image: testing
+  os: testing
   apt_packages:
     - libblas-dev
     - liblapack-dev