From c63526484487fc6ae6fa293418161180274e0c1d Mon Sep 17 00:00:00 2001
From: Tom Schraitle <tom_schr@web.de>
Date: Mon, 26 Oct 2020 15:02:37 +0100
Subject: [PATCH] Try to stick sphinx<2

`pypa/pip#9031`
---
 docs/requirements.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/docs/requirements.txt b/docs/requirements.txt
index dd2f77ca..812a2fc6 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,6 @@
 # requirements file for documentation
-sphinx
+# try to stick with sphinx<2 to build on RTD
+# See #299
+sphinx<2
 # sphinx-argparse
 sphinx-autodoc-typehints