diff --git a/.circleci/config.yml b/.circleci/config.yml
index ffbb4f1a7..5a88e4bf0 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,11 +1,17 @@
-version: 2.0
+version: 2.1
+orbs:
+  browser-tools: circleci/browser-tools@1.4.8
 jobs:
   build:
     docker:
-      - image: circleci/node:10.16-browsers
+      - image: cimg/node:16.20.2-browsers
     steps:
+      - browser-tools/install-browser-tools
       - checkout
-
+      - run: |
+          node --version
+          java --version
+          google-chrome --version
       - restore_cache:
           keys:
           - v1-dependencies-{{ checksum "package.json" }}
diff --git a/package.json b/package.json
index 2685b9f94..2f6bc107f 100644
--- a/package.json
+++ b/package.json
@@ -10,9 +10,9 @@
 		"rollup-plugin-babel": "^4.3.2",
 		"rollup-plugin-json": "^4.0.0",
 		"rollup-plugin-node-resolve": "^5.0.0",
-		"testcafe": "^1.3.1",
-		"testcafe-browser-provider-saucelabs": "^1.7.0",
-		"testcafe-reporter-xunit": "^2.1.0",
+		"testcafe": "^3.6.0",
+		"testcafe-browser-provider-saucelabs": "^3.0.0",
+		"testcafe-reporter-xunit": "^2.2.3",
 		"uglify-js": "^3.5.12"
 	},
 	"description": "JavaScript library for reorderable drag-and-drop lists on modern browsers and touch devices. No jQuery required. Supports Meteor, AngularJS, React, Polymer, Vue, Knockout and any CSS library, e.g. Bootstrap.",
diff --git a/src/Sortable.js b/src/Sortable.js
index 81ff84494..1646dcaa1 100644
--- a/src/Sortable.js
+++ b/src/Sortable.js
@@ -429,10 +429,10 @@ function Sortable(el, options) {
 		on(el, 'mousedown', this._onTapStart);
 		on(el, 'touchstart', this._onTapStart);
 	}
-
+	this._handleEvent = this.handleEvent.bind(this)
 	if (this.nativeDraggable) {
-		on(el, 'dragover', this);
-		on(el, 'dragenter', this);
+		on(el, 'dragover', this._handleEvent);
+		on(el, 'dragenter', this._handleEvent);
 	}
 
 	sortables.push(this.el);
@@ -1678,8 +1678,8 @@ Sortable.prototype = /** @lends Sortable.prototype */ {
 		off(el, 'pointerdown', this._onTapStart);
 
 		if (this.nativeDraggable) {
-			off(el, 'dragover', this);
-			off(el, 'dragenter', this);
+			off(el, 'dragover', this._handleEvent);
+			off(el, 'dragenter', this._handleEvent);
 		}
 		// Remove draggable attributes
 		Array.prototype.forEach.call(el.querySelectorAll('[draggable]'), function (el) {