diff --git a/tox.ini b/tox.ini
index 3580568a0..85d80624a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -98,8 +98,6 @@ deps =
     {[testenv]deps}
     flake8
     flake8-quotes
-# Pin isort version due to bug in 4.2.13, failing checks only on travis!
-    isort==4.2.5
     flake8-isort
     pep8-naming
 commands =