diff --git a/DESCRIPTION b/DESCRIPTION
index f186ae5..84e4f8f 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: shades
-Version: 1.3.1
-Date: 2019-01-07
+Version: 1.4.0
+Date: 2019-08-02
 Title: Simple Colour Manipulation
 Author: Jon Clayden
 Maintainer: Jon Clayden <code@clayden.org>
diff --git a/NEWS b/NEWS
index 7afe956..2e92e26 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,15 @@ Significant changes to the shades package are laid out below for each release.
 
 ===============================================================================
 
+VERSION 1.4.0
+
+- The package now handles missing values, patching up some of the limitations
+  of the underlying core graphics functions. In particular, shade vectors may
+  contain NAs, and will propagate them through manipulations, while NAs are
+  accepted as pass-through values when updating colour properties.
+
+===============================================================================
+
 VERSION 1.3.1
 
 - A fix has been made for compatibility with changes in the next annual release