diff --git a/.readthedocs.yml b/.readthedocs.yml
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+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Build documentation with MkDocs
+mkdocs:
+  configuration: mkdocs.yml
+
+# Optionally set the version of Python and requirements required to build your docs
+# https://github.com/rtfd/readthedocs.org/issues/5250
+python:
+  version: 3.5
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