diff --git a/setup.cfg b/setup.cfg
index 34c3ceb74..94d8292aa 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -35,7 +35,7 @@ classifiers =
 packages = find_namespace:
 setup_requires =
     pytest-runner
-    sphinx
+    sphinx < 3.2
     sphinx_rtd_theme
 install_requires =
     numpy