diff --git a/requirements/requirements-RTD.txt b/requirements/requirements-RTD.txt
index 197a58a..1197375 100644
--- a/requirements/requirements-RTD.txt
+++ b/requirements/requirements-RTD.txt
@@ -1,5 +1,6 @@
 sphinxcontrib-bibtex
+sphinx_rtd_theme
 jupyter_packaging
 matplotlib
 nglview
-scikit-learn>=1.3
\ No newline at end of file
+scikit-learn>=1.3