diff --git a/requirements/edx/development.txt b/requirements/edx/development.txt
index 99e84c279c..1de330b61d 100644
--- a/requirements/edx/development.txt
+++ b/requirements/edx/development.txt
@@ -182,7 +182,7 @@ imagesize==1.1.0          # via sphinx
 incremental==17.5.0
 inflect==2.1.0
 ipaddress==1.0.22
-isort==4.3.18
+isort==4.3.19
 itsdangerous==1.1.0
 itypes==1.1.0
 jinja2-pluralize==0.3.0
diff --git a/requirements/edx/testing.txt b/requirements/edx/testing.txt
index 78025a56cd..14081957f9 100644
--- a/requirements/edx/testing.txt
+++ b/requirements/edx/testing.txt
@@ -176,7 +176,7 @@ idna==2.8
 incremental==17.5.0       # via twisted
 inflect==2.1.0
 ipaddress==1.0.22
-isort==4.3.18
+isort==4.3.19
 itsdangerous==1.1.0       # via flask
 itypes==1.1.0
 jinja2-pluralize==0.3.0