diff --git a/NEWS b/NEWS
index 1cf9e996b..2d7db024d 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,6 @@
+1.5.21.dev0
+ * Add support for old version (2.x) of jsonschema library.
+
 1.5.20
  * Re-release with correct version without dev0 tag.
 
diff --git a/setup.py b/setup.py
index 0feb1e1a7..11a83f15b 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from setuptools import find_packages, setup
 
-VERSION = '1.5.20'
+VERSION = '1.5.21.dev0'
 
 
 setup(