diff --git a/CHANGES.md b/CHANGES.md
index 4a66843..0de2a3a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,8 @@
+v2.4.0
+
+* enough performance improvements to justify a new version. 2-3x
+  speedup depending on mode of operation
+
 v2.3.1
 
 * fixes an issue where astral plane json escape sequences were
diff --git a/README.md b/README.md
index fbab6ce..857043a 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# jsx (v2.3.1) #
+# jsx (v2.4) #
 
 an erlang application for consuming, producing and manipulating [json][json]. 
 inspired by [yajl][yajl]
diff --git a/src/jsx.app.src b/src/jsx.app.src
index a81e5c0..f0090de 100644
--- a/src/jsx.app.src
+++ b/src/jsx.app.src
@@ -1,7 +1,7 @@
 {application, jsx,
 [
     {description, "a streaming, evented json parsing toolkit"},
-    {vsn, "2.3.1"},
+    {vsn, "2.4.0"},
     {modules, [
         jsx,
         jsx_encoder,