diff --git a/doc/sphinx/requirements.txt b/doc/sphinx/requirements.txt
index af79d2c..4555a94 100644
--- a/doc/sphinx/requirements.txt
+++ b/doc/sphinx/requirements.txt
@@ -1,4 +1,4 @@
 docutils==0.16
-Sphinx==2.4.4
+Sphinx==3.4.3
 sphinx_rtd_theme
 six