See readthedocs/readthedocs.org#10290

.readthedocs.yaml

@@ -17,13 +17,13 @@ build:
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
-   configuration: docs/source/conf.py
+   configuration: docs/conf.py
 
 # If using Sphinx, optionally build your docs in additional formats such as PDF
 # formats:
 #    - pdf
 
 # Optionally declare the Python requirements required to build your docs
-# python:
-#  install:
-#   - requirements: docs/requirements.txt
+python:
+   install:
+      - requirements: docs/requirements.txt