diff --git a/requirements/requirements-dev.txt b/requirements/requirements-dev.txt
index b465c2eb..a327158e 100644
--- a/requirements/requirements-dev.txt
+++ b/requirements/requirements-dev.txt
@@ -18,3 +18,4 @@ sphinx-bootstrap-theme == 0.8.1
 numpydoc==1.5.0
 pydocstyle==6.3.0
 mypy
+tox