diff --git a/sphinx-doc/requirements_sphinx.txt b/sphinx-doc/requirements_sphinx.txt
index db98b9f7c72a60ffdb289cf4908e32a5eab57ad0..e853fdb304d3f5fcc3a436b2bb07064d8ad2c681 100644
--- a/sphinx-doc/requirements_sphinx.txt
+++ b/sphinx-doc/requirements_sphinx.txt
@@ -50,7 +50,7 @@ scikit-learn==0.22.1
 scipy==1.5.4
 six==1.14.0
 snowballstemmer==2.0.0
-Sphinx==3.3.0
+Sphinx==3.3.1
 sphinx-automodapi==0.13
 sphinx-markdown-tables==0.0.15
 sphinxcontrib-applehelp==1.0.2