diff --git a/requirements_dev.txt b/requirements_dev.txt
index 03dec557..d322ae60 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,4 +6,5 @@ pytest==6.2.4
 sphinx_click
 sphinx_rtd_theme
 twine
-wheel
\ No newline at end of file
+wheel
+Sphinx