diff --git a/h5p.classes.php b/h5p.classes.php
index 44e9aba..ba1b59a 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -300,6 +300,13 @@ interface H5PFrameworkInterface {
    * Get content without cache.
    */
   public function getNotCached();
+  
+  /**
+   * Get number of contents using library as main library.
+   * 
+   * @param int $library_id
+   */
+  public function getNumContent($library_id);
 }
 
 /**
@@ -1719,6 +1726,35 @@ class H5PCore {
     
     return $embedType;
   }
+  
+  /**
+   * Get the absolute version for the library as a human readable string.
+   * 
+   * @param object $library
+   * @return string
+   */
+  public static function libraryVersion($library) {
+    return $library->major_version . '.' . $library->minor_version . '.' . $library->patch_version;
+  }
+  
+  /**
+   * Detemine which versions content with the given library can be upgraded to.
+   * 
+   * @param object $library
+   * @param array $versions
+   * @return array
+   */
+  public function get_upgrades($library, $versions) {
+   $upgrades = array();
+
+   foreach ($versions as $upgrade) {
+     if ($upgrade->major_version > $library->major_version || $upgrade->major_version === $library->major_version && $upgrade->minor_version > $library->minor_version) {
+       $upgrades[$upgrade->id] = H5PCore::libraryVersion($upgrade);
+     }
+   }
+
+   return $upgrades;
+  }
 }
 
 /**
diff --git a/images/throbber.gif b/images/throbber.gif
new file mode 100644
index 0000000..0177983
Binary files /dev/null and b/images/throbber.gif differ
diff --git a/js/h5p-content-upgrade.js b/js/h5p-content-upgrade.js
new file mode 100644
index 0000000..0d7315b
--- /dev/null
+++ b/js/h5p-content-upgrade.js
@@ -0,0 +1,147 @@
+(function ($) {
+  var info, outData, $container, $throbber, throbberText, majorVersion, minorVersion;
+
+  /**
+   * Generate html for version select.
+   *  
+   * @param {Object} versions
+   * @returns {String}
+   */
+  var getVersionSelect = function (versions) {
+    var html = '';
+    for (var id in versions) {
+      html += '<option value="' + id + '">' + versions[id] + '</option>';
+    }
+    if (html !== '') {
+      html = '<select>' + html + '</select>';
+      return html;
+    }
+  };
+  
+  /**
+   * Process the current batch of parameters.
+   * 
+   * @param {Object} params
+   */
+  var processParameters = function (inData) {
+    var upgraded = {};
+    
+    var i = 0;
+    for (var id in inData.params) {
+      if (!inData.params.hasOwnProperty(id)) {
+        continue;
+      }
+      
+      var param = JSON.parse(inData.params[id]);
+      for (var major in H5PUpgrades) {
+        if (!H5PUpgrades.hasOwnProperty(major) || major < info.majorVersion || major > majorVersion) {
+          continue;
+        }
+        
+        for (var minor in H5PUpgrades[major]) {
+          if (!H5PUpgrades[major].hasOwnProperty(major) || minor <= info.minorVersion || minor > minorVersion) {
+            continue;
+          }
+
+          param = H5PUpgrades[major][minor](param);
+        }
+      }
+      upgraded[id] = JSON.stringify(param);
+      
+      i++;
+      $throbber.text(throbberText + Math.round((info.total - inData.left + i) / (info.total / 100)) + ' %') ;
+    }
+    
+    outData.params = JSON.stringify(upgraded);
+    outData.token = inData.token;
+
+    // Get next round of data to process.
+    getParameters();
+  };
+  
+  /**
+   * Handles errors while processing parameters.
+   * 
+   * @param {Object} params
+   */
+  var process = function (inData) {
+    // Script is loaded. Start processing.
+    try {
+      processParameters(inData);
+    }
+    catch (err) {
+      $container.html('An error occurred while processing parameters: ' + err);
+    }
+  };
+
+  /**
+   * Get the next batch of parameters.
+   */
+  var getParameters = function () {
+    $.post(info.url, outData, function (inData) {
+      if (!(inData instanceof Object)) {
+        // Print errors from backend
+        $container.html(inData);
+        return;
+      } 
+      if (inData.left === '0') {
+        $container.html(info.done);
+        return;
+      }
+      
+      if (inData.script !== undefined) {
+        $.ajax({
+          dataType: 'script',
+          cache: true,
+          url: inData.script
+        }).done(function () {
+          // Start processing
+          process(inData);
+        }).fail(function () {
+          $container.html('Error: Could not load upgrade script.');
+        });
+        return;
+      }
+      
+      // Continue processing
+      process(inData);
+    });
+  };
+
+  // Initialize
+  $(document).ready(function () {
+    // Get library info
+    info = H5PIntegration.getLibraryInfo();
+    
+    // Get and reset container
+    $container = $('#h5p-admin-container').html('<p>' + info.message + '</p>');
+    
+    // Make it possible to select version
+    var $version = $(getVersionSelect(info.versions)).appendTo($container);
+    
+    // Add "go" button
+    $('<button/>', {
+      class: 'h5p-admin-upgrade-button',
+      text: info.buttonLabel,
+      click: function () {
+        outData = {
+          libraryId: $version.val(),
+          token: info.token
+        };
+        
+        // Get version
+        var version = info.versions[outData.libraryId];
+        var versionLevels = version.split('.', 3);
+        majorVersion = versionLevels[0];
+        minorVersion = versionLevels[1];
+        
+        throbberText = 'Upgrading to ' + version + '...';
+        $throbber = H5PUtils.throbber(throbberText);
+        $container.html('').append($throbber);
+        
+        // Start upgrade progress
+        getParameters();
+      }
+    }).appendTo($container);
+  });  
+})(H5P.jQuery);
\ No newline at end of file
diff --git a/js/h5p-library-details.js b/js/h5p-library-details.js
index 108db88..e274d22 100644
--- a/js/h5p-library-details.js
+++ b/js/h5p-library-details.js
@@ -41,7 +41,7 @@ var H5PLibraryDetails= H5PLibraryDetails || {};
     
     var count;
     if (H5PLibraryDetails.library.notCached !== undefined) {
-      count = -1;
+      count = H5PIntegration.i18n.H5P.NA;
     }
     else if (H5PLibraryDetails.library.content === undefined) {
       count = 0; 
diff --git a/js/h5p-library-list.js b/js/h5p-library-list.js
index 9673765..79bc400 100644
--- a/js/h5p-library-list.js
+++ b/js/h5p-library-list.js
@@ -33,25 +33,38 @@ var H5PLibraryList= H5PLibraryList || {};
     $table.addClass('libraries');
     
     // Add libraries
+    var t = H5PIntegration.i18n.H5P;
     $.each (libraries.listData, function (index, library) {
       var $libraryRow = H5PUtils.createTableRow([
-        library.name, 
-        library.machineName, 
-        library.contentCount, 
-        library.libraryDependencyCount,
-        '<div class="h5p-admin-buttons-wrapper"><button class="h5p-admin-view-library"></button>' +
-        '<button class="h5p-admin-delete-library"></button></div>'
+        library.title,
+        library.numContent,
+        library.numContentDependencies === -1 ? t.NA : library.numContentDependencies,
+        library.numLibraryDependencies,
+        '<div class="h5p-admin-buttons-wrapper">\
+          <button class="h5p-admin-upgrade-library"></button>\
+          <button class="h5p-admin-view-library" title="' + t.viewLibrary + '"></button>\
+          <button class="h5p-admin-delete-library"></button>\
+        </div>'
       ]);
       
+      if (library.upgradeUrl !== null && library.numContent !== '0') {
+        $('.h5p-admin-upgrade-library', $libraryRow).attr('title', t.upgradeLibrary).click(function () {
+          window.location.href = library.upgradeUrl;
+        });
+      }
+      else {
+        $('.h5p-admin-upgrade-library', $libraryRow).attr('disabled', true);
+      }
+      
       // Open details view when clicked
       $('.h5p-admin-view-library', $libraryRow).on('click', function () {
         window.location.href = library.detailsUrl;
       });
       
       var $deleteButton = $('.h5p-admin-delete-library', $libraryRow);
-      if (library.contentCount !== 0 || library.libraryDependencyCount !== 0) {
+      if (library.numContent !== '0' || library.numContentDependencies !== '0' || library.numLibraryDependencies !== '0') {
         // Disabled delete if content.
-        $deleteButton.attr('disabled', true); //.addClass('disabled');
+        $deleteButton.attr('disabled', true).attr('title', t.deleteLibrary);
       }
       else {
         // Go to delete page om click.
diff --git a/js/h5p-utils.js b/js/h5p-utils.js
index 5cda763..d8faf68 100644
--- a/js/h5p-utils.js
+++ b/js/h5p-utils.js
@@ -66,6 +66,19 @@ var H5PUtils = H5PUtils || {};
     return template;
   };
   
+  /**
+   * Get throbber with given text.
+   * 
+   * @param {String} text
+   * @returns {$}
+   */
+  H5PUtils.throbber = function (text) {
+    return $('<div/>', {
+      class: 'h5p-throbber',
+      text: text
+    });
+  };
+  
   /**
    * Makes it possbile to rebuild all content caches from admin UI.
    * @param {Object} notCached
diff --git a/styles/h5p-admin.css b/styles/h5p-admin.css
index 664ddab..6d63c9e 100644
--- a/styles/h5p-admin.css
+++ b/styles/h5p-admin.css
@@ -47,6 +47,10 @@
   text-indent: -0.125em;
   margin: 0.125em 0.125em 0 0.125em;
 }
+.h5p-admin-upgrade-library:before {
+  font-family: 'H5P';
+  content: "\2191";
+}
 .h5p-admin-view-library:before {
   font-family: 'H5P';
   content: "\e888";
@@ -56,19 +60,22 @@
   content: "\e88e";
 }
 
-.h5p-admin-table.libraries button:hover,
-.h5p-admin-table.libraries .h5p-admin-delete-library:hover {
+.h5p-admin-table.libraries button:hover {
   background-color: #d0d0d0;
 }
-
-.h5p-admin-table.libraries .h5p-admin-delete-library:disabled:hover {
+.h5p-admin-table.libraries button:disabled:hover {
   background-color: #e0e0e0;
+  cursor: default;
 }
 
-.h5p-admin-table.libraries .h5p-admin-delete-library {
+.h5p-admin-upgrade-library {
+  color: #0f01f9; 
+}
+.h5p-admin-delete-library {
   color: #f9010f; 
 }
-.h5p-admin-table.libraries .h5p-admin-delete-library:disabled {
+.h5p-admin-delete-library:disabled,
+.h5p-admin-upgrade-library:disabled {
   cursor: default;
   color: #c0c0c0;
 }
diff --git a/styles/h5p.css b/styles/h5p.css
index 812aeda..529c4c9 100644
--- a/styles/h5p.css
+++ b/styles/h5p.css
@@ -313,3 +313,9 @@ div.h5p-fullscreen {
   margin-left: 0.25em;
   padding-left: 0.25em;
 }
+.h5p-throbber {
+  background: url('../images/throbber.gif') left center no-repeat;
+  padding-left: 38px;
+  min-height: 30px;
+  line-height: 30px;
+}
\ No newline at end of file