1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index f33c60754..c4d818e2f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,7 @@ commands = pylint -rn --rcfile={toxinidir}/pylintrc --load-plugins=pylint.extens
 deps =
    astroid>=1.5.1,<1.6
    coverage
-   isort
+   isort<4.3.0
    mccabe
    backports.functools_lru_cache
    pytest<3.3