diff --git a/changelog.txt b/changelog.txt
index a7082d6f..8e53e930 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -8,7 +8,7 @@ OPENSEADRAGON CHANGELOG
 * Added isFullScreen method to Viewer (#2067 @JachiOnuoha)
 * Fixed an issue where turning off panVertical or panHorizontal would not affect the panning keyboard combos (#2069 @JachiOnuoha)
 * Cleaned up console.logs so that errors and warnings use console.error and console.warn as appropriate (#2073 @Abhishek-90)
-* Improved documentation (#2067 @JachiOnuoha, #2112 @shyamkumaryadav, #2152 @joedf)
+* Improved documentation (#2067 @JachiOnuoha, #2112 @shyamkumaryadav, #2152 @joedf, #2155 @samwilson)
 * Added option to include POST data when loading files via Ajax (#2072 @Aiosa)
 * Fixed: Setting useCanvas to false would break the viewer (#2116 @rvv-bouvet)
 * Allow silencing multi-image warnings on viewport coordinate conversion functions (#2120 @claycoleman)
@@ -20,6 +20,8 @@ OPENSEADRAGON CHANGELOG
 * Now if you pass an error handler into makeAjaxRequest, it doesn't report errors into the console (#2142 @Aiosa)
 * Fixed error caused by attaching MouseTracker to the page's document element (#2145 @tdiprima)
 * Added fallback and deprecation warning for Viewer.buttons (which got changed to buttonGroup in 3.0.0) (#2153 @devbyjonah)
+* Pinch to zoom now zooms around the center of the pinch, rather than the center of the viewer (#2158 @cavenel)
+* Fixed an issue that would sometimes cause problems with freeing up ImageTileSource memory (#2162 @pearcetm)
 
 3.0.0:
 
diff --git a/package-lock.json b/package-lock.json
index b65a2524..b43d15bb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -295,7 +295,7 @@
     "array-each": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
-      "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
+      "integrity": "sha512-zHjL5SZa68hkKHBFBK6DJCTtr9sfTCPCaph/L7tMSLcTFgy+zX7E+6q5UArbtOtMBCtxdICpfTCspRse+ywyXA==",
       "dev": true
     },
     "array-slice": {
@@ -1908,9 +1908,9 @@
       "dev": true
     },
     "grunt": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.5.2.tgz",
-      "integrity": "sha512-XCtfaIu72OyDqK24MjWiGC9SwlkuhkS1mrULr1xzuJ2XqAFhP3ZAchZGHJeSCY6mkaOXU4F7SbmmCF7xIVoC9w==",
+      "version": "1.5.3",
+      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.5.3.tgz",
+      "integrity": "sha512-mKwmo4X2d8/4c/BmcOETHek675uOqw0RuA/zy12jaspWqvTp4+ZeQF1W+OTpcbncnaBsfbQJ6l0l4j+Sn/GmaQ==",
       "dev": true,
       "requires": {
         "dateformat": "~3.0.3",
diff --git a/src/imagetilesource.js b/src/imagetilesource.js
index cbea1ef0..6d49bbd3 100644
--- a/src/imagetilesource.js
+++ b/src/imagetilesource.js
@@ -272,8 +272,10 @@
          */
         _freeupCanvasMemory: function () {
             for (var i = 0; i < this.levels.length; i++) {
-                this.levels[i].context2D.canvas.height = 0;
-                this.levels[i].context2D.canvas.width = 0;
+                if(this.levels[i].context2D){
+                    this.levels[i].context2D.canvas.height = 0;
+                    this.levels[i].context2D.canvas.width = 0;
+                }
             }
         },
     });
diff --git a/src/openseadragon.js b/src/openseadragon.js
index 9c84c369..545aef5d 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -2319,7 +2319,7 @@ function OpenSeadragon( options ){
          * @param {Function} options.success - a function to call on a successful response
          * @param {Function} options.error - a function to call on when an error occurs
          * @param {Object} options.headers - headers to add to the AJAX request
-         * @param {String} options.responseType - the response type of the the AJAX request
+         * @param {String} options.responseType - the response type of the AJAX request
          * @param {String} options.postData - HTTP POST data (usually but not necessarily in k=v&k2=v2... form,
          *      see TileSource::getPostData), GET method used if null
          * @param {Boolean} [options.withCredentials=false] - whether to set the XHR's withCredentials
diff --git a/src/rectangle.js b/src/rectangle.js
index 8f255506..3ef381dc 100644
--- a/src/rectangle.js
+++ b/src/rectangle.js
@@ -230,7 +230,7 @@ $.Rect.prototype = {
      * Returns the width and height component as a vector OpenSeadragon.Point
      * @function
      * @returns {OpenSeadragon.Point} The 2 dimensional vector representing the
-     *  the width and height of the rectangle.
+     *  width and height of the rectangle.
      */
     getSize: function() {
         return new $.Point(this.width, this.height);
diff --git a/src/viewer.js b/src/viewer.js
index ab779142..d33a4a26 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -3289,9 +3289,6 @@ function onCanvasPinch( event ) {
         if ( gestureSettings.pinchToZoom &&
                     (!canvasPinchEventArgs.preventDefaultPanAction || !canvasPinchEventArgs.preventDefaultZoomAction) ) {
             centerPt = this.viewport.pointFromPixel( event.center, true );
-            if ( !canvasPinchEventArgs.preventDefaultZoomAction ) {
-                this.viewport.zoomBy( event.distance / event.lastDistance, centerPt, true );
-            }
             if ( gestureSettings.zoomToRefPoint && !canvasPinchEventArgs.preventDefaultPanAction ) {
                 lastCenterPt = this.viewport.pointFromPixel( event.lastCenter, true );
                 panByPt = lastCenterPt.minus( centerPt );
@@ -3303,6 +3300,9 @@ function onCanvasPinch( event ) {
                 }
                 this.viewport.panBy(panByPt, true);
             }
+            if ( !canvasPinchEventArgs.preventDefaultZoomAction ) {
+                this.viewport.zoomBy( event.distance / event.lastDistance, centerPt, true );
+            }
             this.viewport.applyConstraints();
         }
         if ( gestureSettings.pinchRotate && !canvasPinchEventArgs.preventDefaultRotateAction ) {