Stick to isort==4.3.21 (#1223)

diff --git a/model-optimizer/requirements_dev.txt b/model-optimizer/requirements_dev.txt
index 2123de2a031fd58109bbddecd47c55b9f54d80cb..d102b918c5ff2b5b28a942aab38281266410cad0 100644 (file)
--- a/model-optimizer/requirements_dev.txt
+++ b/model-optimizer/requirements_dev.txt
@@ -1,6 +1,7 @@
 coverage==4.4.2
 m2r==0.1.12
 pyenchant==1.6.11
+isort==4.3.21
 astroid==2.1.0
 pylint==2.1.1
 Sphinx==1.6.5