diff --git a/doc/requirements.txt b/doc/requirements.txt
index 9471750..1db3a70 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -4,4 +4,5 @@ matplotlib>=3.4.2
 sphinxcontrib-httpdomain>=1.7.0
 torch>=1.8.1
 scipy>=1.6.3
-sphinxcontrib-bibtex>=2.3.0 
\ No newline at end of file
+sphinxcontrib-bibtex>=2.3.0
+sphinx-rtd-theme>=1.3.0