diff --git a/doc/requirements.txt b/doc/requirements.txt
index 1fb541027..9b49bb272 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,7 +1,7 @@
 # https://github.com/sphinx-doc/sphinx/issues/11662
 sphinx>=4.0.2,!=7.2.5
 recommonmark
-sphinx_rtd_theme
+sphinx_rtd_theme>=0.6
 sphinx_markdown_tables
 sphinx-argparse<0.5.0
 myst-parser