diff --git a/CHANGES.rst b/CHANGES.rst
index 1b8d31e..526a5c8 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,12 @@
  Changes
 =========
 
+4.2.3 (unreleased)
+==================
+
+- Nothing changed yet.
+
+
 4.2.2 (2018-10-19)
 ==================
 
diff --git a/version.txt b/version.txt
index af8c8ec..7831e5b 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-4.2.2
+4.2.3.dev0