diff --git a/examples/cookbook-plain/requirements.txt b/examples/cookbook-plain/requirements.txt
index 2154fd8..ea1f4ba 100644
--- a/examples/cookbook-plain/requirements.txt
+++ b/examples/cookbook-plain/requirements.txt
@@ -1,4 +1,4 @@
 graphene
 graphene-django
 graphql-core>=2.1rc1
-django==2.1.6
+django==2.1.9