diff --git a/requirements.txt b/requirements.txt
index 69b1419fa..c5ddc8488 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ docutils==0.15
 jinja2==3.0.3
 myst-parser==1.0.0
 sphinx_copybutton==0.5.2
-sphinx_rtd_theme
+sphinx_rtd_theme==2.0.0
 sphinx-autobuild
 sphinx==5.3.0
 sphinxcontrib-plantuml