diff --git a/deps/boost-1.75.0/libs/hof/doc/requirements.txt b/deps/boost-1.75.0/libs/hof/doc/requirements.txt
index da2871fc6a..130f4d6843 100644
--- a/deps/boost-1.75.0/libs/hof/doc/requirements.txt
+++ b/deps/boost-1.75.0/libs/hof/doc/requirements.txt
@@ -4,7 +4,7 @@
 #    Distributed under the Boost Software License, Version 1.0. (See accompanying
 #    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 #==============================================================================
-sphinx>=1.5,<1.6
+sphinx>=3.3.0,<1.6
 # recommonmark==0.4.0
 git+https://github.com/pfultz2/recommonmark@develop
 sphinx-boost>0.0.2