Pin last known working version of Sphinx

Was working with 4.1.2, broke with 4.2.0, see sphinx-doc/sphinx#9631
biopython · Sep 13, 2021 · 3f7a13d · 3f7a13d
1 parent fb570df
commit 3f7a13d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.circleci/requirements-sphinx.txt b/.circleci/requirements-sphinx.txt
@@ -4,7 +4,7 @@ numpy
 rdflib
 reportlab
 scipy
-sphinx>=3.5.0
+sphinx==4.1.2
 numpydoc==1.0.0
 pygments
 sphinx_rtd_theme