diff --git a/requirements.txt b/requirements.txt
index 9ca946cdb..6fae53f6f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,9 @@
 tox==2.2.1
 pylint==2.2.2
 pytest==3.0.7
+isort==4.3.21
 mock==2.0.0
 boto3~=1.10, >=1.10.47
 pyyaml>=5.1
 astroid==2.1.0
-schema==0.7.1
\ No newline at end of file
+schema==0.7.1