1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 10f9db9..210d06e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -59,7 +59,7 @@ deps =
     hypothesis
     pytest
     pytest-mock
-    fastnumbers
+    fastnumbers>=5.0.1
     typing_extensions
 commands =
     mypy --strict natsort tests