Update sphinx to the latest version

Change-Id: I8036cd474bcf74432c48959278b1af4a7d79a76e

diff --git a/doc/requirements.txt b/doc/requirements.txt
index 44cb2082b41685958428276fb07a653a55b7139c..559dc80e1ee31e5e64f0abc32376b299a7f94bb8 100644 (file)
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,5 @@
 # This is required for the docs build jobs
-sphinx>=2.0.0,!=2.1.0 # BSD
+sphinx>=3.5.1 # BSD
 openstackdocstheme>=2.2.1 # Apache-2.0
 
 # This is required for the releasenotes build jobs