diff --git a/dev_requirements.txt b/dev_requirements.txt
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -5,5 +5,5 @@ pytest-localserver >= 0.5.0, < 0.6
 mock >= 3.0.0, < 4.1
 Sphinx >= 1.8.0, < 3.1
 WebTest >= 2.0.6, < 2.1
-isort == 4.3.21
+isort == 5.1.2
 pyflakes == 2.2.0