diff --git a/docs/requirements.txt b/docs/requirements.txt
index c0ffd67..eb5e0fd 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,7 +1,7 @@
 breathe>=4.9.1
 colorama
-docutils>=0.14
-sphinx>=2.0.1
+docutils==0.16
+sphinx>=3.5.1
 sphinx_rtd_theme
 sphinx-tabs
 sphinxcontrib-svg2pdfconverter