diff --git a/test-requirements.txt b/test-requirements.txt
index daf9bab9..e1ed15de 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,7 @@
 pycodestyle==2.14.0
 pydocstyle==6.3.0
 dodgy==0.2.1
-isort==8.0.1
+isort==9.0.1
 mypy==2.3.1
 Flask-Testing==0.8.1
 nose2-cov==1.0a4