diff --git a/docs/requirements.txt b/docs/requirements.txt
index 0990c2a..389cedd 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,3 +4,4 @@
 # sphinx_rtd_theme
 myst-parser[linkify]
 sphinx>=3.2.1
+sphinx_rtd_theme