1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 9db8e4e..fb2c58f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -57,7 +57,7 @@ skip_install = true
 deps =
     mypy
 commands =
-    mypy natsort
+    mypy --strict natsort
 skip_install = true
 
 # Build documentation.