diff --git a/CHANGELOG.md b/CHANGELOG.md
index 452e41d7..a0573970 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,14 @@
+v3.7.1 - Mon, 10 Dec 2018 13:12:33 UTC
+--------------------------------------
+
+- [2ae092a](../../commit/2ae092a) [fixed] Allow empty classNames for body (#720)
+- [8d8f476](../../commit/8d8f476) React-Modal: chromeHeadless use
+- [fc53400](../../commit/fc53400) [fixed] Allow ReactDOM.createPortal to be mocked in tests
+- [6a6bcf7](../../commit/6a6bcf7) [fixed] Render `testId` property
+- [1b561fc](../../commit/1b561fc) [fixed] if tabbable element is undefined, focus head or tail based on shiftKey
+- [86632aa](../../commit/86632aa) [fixed] check if element exists before focusing in scopeTab helper
+
+
 v3.6.1 - Tue, 25 Sep 2018 11:47:45 UTC
 --------------------------------------
 
diff --git a/bower.json b/bower.json
index d56d77fd..60e9ab78 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "react-modal",
-  "version": "3.6.1",
+  "version": "3.7.1",
   "homepage": "https://github.com/reactjs/react-modal",
   "authors": [
     "Ryan Florence",
diff --git a/dist/react-modal.js b/dist/react-modal.js
index c61a04ee..b20e0e0c 100644
--- a/dist/react-modal.js
+++ b/dist/react-modal.js
@@ -542,7 +542,10 @@ var portalClassName = exports.portalClassName = "ReactModalPortal";
 var bodyOpenClassName = exports.bodyOpenClassName = "ReactModal__Body--open";
 
 var isReact16 = _reactDom2.default.createPortal !== undefined;
-var createPortal = isReact16 ? _reactDom2.default.createPortal : _reactDom2.default.unstable_renderSubtreeIntoContainer;
+
+var getCreatePortal = function getCreatePortal() {
+  return isReact16 ? _reactDom2.default.createPortal : _reactDom2.default.unstable_renderSubtreeIntoContainer;
+};
 
 function getParentElement(parentSelector) {
   return parentSelector();
@@ -569,6 +572,7 @@ var Modal = function (_Component) {
     }, _this.portalRef = function (ref) {
       _this.portal = ref;
     }, _this.renderPortal = function (props) {
+      var createPortal = getCreatePortal();
       var portal = createPortal(_this, _react2.default.createElement(_ModalPortal2.default, _extends({ defaultStyles: Modal.defaultStyles }, props)), _this.node);
       _this.portalRef(portal);
     }, _temp), _possibleConstructorReturn(_this, _ret);
@@ -652,6 +656,7 @@ var Modal = function (_Component) {
         this.node = document.createElement("div");
       }
 
+      var createPortal = getCreatePortal();
       return createPortal(_react2.default.createElement(_ModalPortal2.default, _extends({
         ref: this.portalRef,
         defaultStyles: Modal.defaultStyles
@@ -1629,7 +1634,7 @@ var ModalPortal = function (_Component) {
 
       // Remove classes.
 
-      classList.remove(document.body, bodyOpenClassName);
+      bodyOpenClassName && classList.remove(document.body, bodyOpenClassName);
 
       htmlOpenClassName && classList.remove(document.getElementsByTagName("html")[0], htmlOpenClassName);
 
@@ -1843,7 +1848,7 @@ var ModalPortal = function (_Component) {
 
       // Add classes.
 
-      classList.add(document.body, bodyOpenClassName);
+      bodyOpenClassName && classList.add(document.body, bodyOpenClassName);
 
       htmlOpenClassName && classList.add(document.getElementsByTagName("html")[0], htmlOpenClassName);
 
@@ -1888,7 +1893,9 @@ var ModalPortal = function (_Component) {
             onClick: this.handleContentOnClick,
             role: this.props.role,
             "aria-label": this.props.contentLabel
-          }, this.attributesFromObject("aria", this.props.aria || {}), this.attributesFromObject("data", this.props.data || {})),
+          }, this.attributesFromObject("aria", this.props.aria || {}), this.attributesFromObject("data", this.props.data || {}), {
+            "data-testid": this.props.testId
+          }),
           this.props.children
         )
       );
@@ -2117,6 +2124,15 @@ function scopeTab(node, event) {
     x += shiftKey ? -1 : 1;
   }
 
+  // If the tabbable element does not exist,
+  // focus head/tail based on shiftKey
+  if (typeof tabbable[x] === "undefined") {
+    event.preventDefault();
+    target = shiftKey ? tail : head;
+    target.focus();
+    return;
+  }
+
   event.preventDefault();
 
   tabbable[x].focus();
diff --git a/dist/react-modal.min.js b/dist/react-modal.min.js
index c92fb84d..8b6cf466 100644
--- a/dist/react-modal.min.js
+++ b/dist/react-modal.min.js
@@ -9,12 +9,12 @@
  *
  * http://api.jqueryui.com/category/ui-core/
  */
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It is not recommended, but you can opt-out","by setting `ariaHideApp={false}`."].join(" ")),!1)}function s(e){a(e)&&(e||d).setAttribute("aria-hidden","true")}function i(e){a(e)&&(e||d).removeAttribute("aria-hidden")}function u(){d=null}function l(){d=null}Object.defineProperty(t,"__esModule",{value:!0}),t.assertNodeList=o,t.setElement=r,t.validateElement=a,t.hide=s,t.show=i,t.documentNotReadyOrSSRTesting=u,t.resetForTesting=l;var c=n(19),f=function(e){return e&&e.__esModule?e:{default:e}}(c),p=n(3),d=null},function(e,t,n){"use strict";Object.defineProperty(t,"__esModule",{value:!0});var o=n(10),r=function(e){return e&&e.__esModule?e:{default:e}}(o);t.default=r.default,e.exports=t.default},function(e,t,n){"use strict";function o(e){return e&&e.__esModule?e:{default:e}}function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function a(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been 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n&&e(t.prototype,n),o&&e(t,o),t}}(),c=n(4),f=o(c),p=n(11),d=o(p),y=n(5),h=o(y),m=n(16),v=o(m),b=n(8),O=function(e){if(e&&e.__esModule)return e;var t={};if(null!=e)for(var n in e)Object.prototype.hasOwnProperty.call(e,n)&&(t[n]=e[n]);return t.default=e,t}(b),g=n(3),w=o(g),C=n(22),_=t.portalClassName="ReactModalPortal",S=t.bodyOpenClassName="ReactModal__Body--open",j=void 0!==d.default.createPortal,E=j?d.default.createPortal:d.default.unstable_renderSubtreeIntoContainer,P=function(e){function t(){var e,n,o,s;r(this,t);for(var l=arguments.length,c=Array(l),p=0;p<l;p++)c[p]=arguments[p];return n=o=a(this,(e=t.__proto__||Object.getPrototypeOf(t)).call.apply(e,[this].concat(c))),o.removePortal=function(){!j&&d.default.unmountComponentAtNode(o.node),i(o.props.parentSelector).removeChild(o.node)},o.portalRef=function(e){o.portal=e},o.renderPortal=function(e){var n=E(o,f.default.createElement(v.default,u({defaultStyles:t.defaultStyles},e)),o.node);o.portalRef(n)},s=n,a(o,s)}return 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diff --git a/package.json b/package.json
index 24b5622d..484a4e92 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-modal",
-  "version": "3.6.1",
+  "version": "3.7.1",
   "description": "Accessible modal dialog component for React.JS",
   "main": "./lib/index.js",
   "module": "./lib/index.js",