diff --git a/.readthedocs.yaml b/.readthedocs.yaml
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+# Configuration on how ReadTheDocs (RTD) builds our documentation
+# ref: https://readthedocs.org/projects/the-littlest-jupyterhub/
+# ref: https://docs.readthedocs.io/en/stable/config-file/v2.html
+
+# Required (RTD configuration version)
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.9"
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/conf.py
+
+# Optionally build your docs in additional formats such as PDF and ePub
+formats: []
+
+python:
+  install:
+    # WARNING: This requirements file will be installed without the pip
+    #          --upgrade flag in an existing environment. This means that if a
+    #          package is specified without a lower boundary, we may end up
+    #          accepting the existing version.
+    #
+    #          ref: https://github.com/readthedocs/readthedocs.org/blob/0e3df509e7810e46603be47d268273c596e68455/readthedocs/doc_builder/python_environments.py#L335-L344
+    - requirements: docs/requirements.txt