diff --git a/tox.ini b/tox.ini
index 099cda3e4..4ef7b851e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -88,7 +88,7 @@ commands = {[testenv:pydef]commands}
 [testenv:isort]
 deps =
     {[testenv]deps}
-    isort>=4.2.0
+    isort>=4.2.5
 whitelist_externals =
     {[testenv]whitelist_externals}
     isort