diff --git a/README.md b/README.md
index 129e8d88..bef7de5d 100644
--- a/README.md
+++ b/README.md
@@ -77,6 +77,7 @@ It profits from these great projects:
 * updates jQuery.mousewheel to 3.1.3
 * updates Moment.js to 2.1.0
 * updates markdown-js to 0.4.0-9c21acdf08
+* updates json2.js to 2013-05-26
 * adds `uk` translation by Viktor Matveenko
 * updates to `pl` translation by Mark
 
diff --git a/src/_h5ai/client/js/lib/json2-2011.10.19.js b/src/_h5ai/client/js/lib/json2-2013-05-26.js
similarity index 99%
rename from src/_h5ai/client/js/lib/json2-2011.10.19.js
rename to src/_h5ai/client/js/lib/json2-2013-05-26.js
index 3b0c872d..d89ecc7a 100644
--- a/src/_h5ai/client/js/lib/json2-2011.10.19.js
+++ b/src/_h5ai/client/js/lib/json2-2013-05-26.js
@@ -1,6 +1,6 @@
 /*
     json2.js
-    2011-10-19
+    2013-05-26
 
     Public Domain.
 
@@ -159,8 +159,7 @@
 // Create a JSON object only if one does not already exist. We create the
 // methods in a closure to avoid creating global variables.
 
-var JSON;
-if (!JSON) {
+if (typeof JSON !== 'object') {
     JSON = {};
 }
 
@@ -174,7 +173,7 @@ if (!JSON) {
 
     if (typeof Date.prototype.toJSON !== 'function') {
 
-        Date.prototype.toJSON = function (key) {
+        Date.prototype.toJSON = function () {
 
             return isFinite(this.valueOf())
                 ? this.getUTCFullYear()     + '-' +
@@ -188,7 +187,7 @@ if (!JSON) {
 
         String.prototype.toJSON      =
             Number.prototype.toJSON  =
-            Boolean.prototype.toJSON = function (key) {
+            Boolean.prototype.toJSON = function () {
                 return this.valueOf();
             };
     }