diff --git a/.readthedocs.yml b/.readthedocs.yml
index fab47a3fde7fed3e5bb33b820eab79db8df115f3..5a415d4c43ca2b055810acb4432c17db44ecafc5 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -15,6 +15,7 @@ formats:
 python:
   version: 3.7
   install:
+    - requirements:  requirements_dev.txt
     - requirements:  doc/source/requirements.txt