diff --git a/.readthedocs.yml b/.readthedocs.yml
index e226448..684abea 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -5,6 +5,7 @@ formats:
 python:
   version: 3.7
   install:
-     - requirements: doc/requirements.txt
+     - method: pip
+       requirements: doc/requirements.txt
      - method: setuptools
        path: .