diff --git a/docs/requirements.txt b/docs/requirements.txt
index 1d5e0d5b..ab1cf848 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,3 @@
 myst-parser>=0.17
 sphinxcontrib-mermaid>=0.7.1
+sphinx_rtd_theme>=2.0.0