diff --git a/doc/python_api/requirements.txt b/doc/python_api/requirements.txt
index 0c6a6883145..11423966f06 100644
--- a/doc/python_api/requirements.txt
+++ b/doc/python_api/requirements.txt
@@ -1,2 +1,2 @@
-Sphinx==3.4.3
+Sphinx==3.5.1
 sphinx_rtd_theme==0.5.1