diff --git a/requirements.txt b/requirements.txt
index 810e4ec..2bdbdbb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ cryptography==2.9.2
 enum34==1.1.10
 idna==2.9
 ipaddress==1.0.23
-isort==4.3.21
+isort==5.9.3
 lazy-object-proxy==1.5.0
 mccabe==0.6.1
 openbsd==0.1.0