diff --git a/theme/bootstrapbase/javascript/html5shiv.js b/theme/bootstrapbase/javascript/html5shiv.js
index 4875fbb2f4d..45ea723dd58 100644
--- a/theme/bootstrapbase/javascript/html5shiv.js
+++ b/theme/bootstrapbase/javascript/html5shiv.js
@@ -1,10 +1,10 @@
 /**
-* @preserve HTML5 Shiv v3.6.2 | @afarkas @jdalton @jon_neal @rem | MIT/GPL2 Licensed
+* @preserve HTML5 Shiv 3.7.3 | @afarkas @jdalton @jon_neal @rem | MIT/GPL2 Licensed
 */
 ;(function(window, document) {
 /*jshint evil:true */
   /** version */
-  var version = '3.6.2';
+  var version = '3.7.3';
 
   /** Preset options */
   var options = window.html5 || {};
@@ -82,7 +82,25 @@
     return typeof elements == 'string' ? elements.split(' ') : elements;
   }
 
-    /**
+  /**
+   * Extends the built-in list of html5 elements
+   * @memberOf html5
+   * @param {String|Array} newElements whitespace separated list or array of new element names to shiv
+   * @param {Document} ownerDocument The context document.
+   */
+  function addElements(newElements, ownerDocument) {
+    var elements = html5.elements;
+    if(typeof elements != 'string'){
+      elements = elements.join(' ');
+    }
+    if(typeof newElements != 'string'){
+      newElements = newElements.join(' ');
+    }
+    html5.elements = elements +' '+ newElements;
+    shivDocument(ownerDocument);
+  }
+
+   /**
    * Returns the data associated to the given document
    * @private
    * @param {Document} ownerDocument The document.
@@ -103,7 +121,7 @@
    * returns a shived element for the given nodeName and document
    * @memberOf html5
    * @param {String} nodeName name of the element
-   * @param {Document} ownerDocument The context document.
+   * @param {Document|DocumentFragment} ownerDocument The context document.
    * @returns {Object} The shived element.
    */
   function createElement(nodeName, ownerDocument, data){
@@ -133,7 +151,7 @@
     //   a 403 response, will cause the tab/window to crash
     // * Script elements appended to fragments will execute when their `src`
     //   or `text` property is set
-    return node.canHaveChildren && !reSkip.test(nodeName) ? data.frag.appendChild(node) : node;
+    return node.canHaveChildren && !reSkip.test(nodeName) && !node.tagUrn ? data.frag.appendChild(node) : node;
   }
 
   /**
@@ -187,7 +205,7 @@
       'var n=f.cloneNode(),c=n.createElement;' +
       'h.shivMethods&&(' +
         // unroll the `createElement` calls
-        getElements().join().replace(/\w+/g, function(nodeName) {
+        getElements().join().replace(/[\w\-:]+/g, function(nodeName) {
           data.createElem(nodeName);
           data.frag.createElement(nodeName);
           return 'c("' + nodeName + '")';
@@ -213,7 +231,7 @@
     if (html5.shivCSS && !supportsHtml5Styles && !data.hasCSS) {
       data.hasCSS = !!addStyleSheet(ownerDocument,
         // corrects block display not defined in IE6/7/8/9
-        'article,aside,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}' +
+        'article,aside,dialog,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}' +
         // adds styling not present in IE6/7/8/9
         'mark{background:#FF0;color:#000}' +
         // hides non-rendered elements
@@ -244,7 +262,7 @@
      * @memberOf html5
      * @type Array|String
      */
-    'elements': options.elements || 'abbr article aside audio bdi canvas data datalist details figcaption figure footer header hgroup main mark meter nav output progress section summary template time video',
+    'elements': options.elements || 'abbr article aside audio bdi canvas data datalist details dialog figcaption figure footer header hgroup main mark meter nav output picture progress section summary template time video',
 
     /**
      * current version of html5shiv
@@ -287,7 +305,10 @@
     createElement: createElement,
 
     //creates a shived documentFragment
-    createDocumentFragment: createDocumentFragment
+    createDocumentFragment: createDocumentFragment,
+
+    //extends list of elements
+    addElements: addElements
   };
 
   /*--------------------------------------------------------------------------*/
@@ -298,4 +319,8 @@
   // shiv the document
   shivDocument(document);
 
-}(this, document));
+  if(typeof module == 'object' && module.exports){
+    module.exports = html5;
+  }
+
+}(typeof window !== "undefined" ? window : this, document));
diff --git a/theme/bootstrapbase/thirdpartylibs.xml b/theme/bootstrapbase/thirdpartylibs.xml
index bfbf0e48492..57c10ed7e8c 100644
--- a/theme/bootstrapbase/thirdpartylibs.xml
+++ b/theme/bootstrapbase/thirdpartylibs.xml
@@ -11,7 +11,7 @@
     <location>javascript/html5shiv.js</location>
     <name>Html5Shiv</name>
     <license>Apache</license>
-    <version>3.6.2</version>
+    <version>3.7.3</version>
     <licenseversion>2.0</licenseversion>
   </library>
 </libraries>
diff --git a/theme/bootstrapbase/upgrade.txt b/theme/bootstrapbase/upgrade.txt
index ceb6e51715a..3c6a47a468d 100644
--- a/theme/bootstrapbase/upgrade.txt
+++ b/theme/bootstrapbase/upgrade.txt
@@ -1,6 +1,9 @@
 This file describes API changes in /theme/bootstrapbase
 information provided here is intended especially for theme designers.
 
+=== 3.0 ===
+* html5shiv updated to 3.7.3
+
 === 2.6 ===
 Notes:
 * File theme/bootstrapbase/less/moodle/grade.less is removed. Corrections are