diff --git a/requirements.txt b/requirements.txt
index 1d91ce49..a4bb5bf7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,4 +8,5 @@ sympy
 plotly
 scons
 myst_parser
+sphinx-rtd-theme
 portpicker
\ No newline at end of file