diff --git a/components/date-picker/index.en-US.md b/components/date-picker/index.en-US.md
index e9efe64e36..8a17970716 100644
--- a/components/date-picker/index.en-US.md
+++ b/components/date-picker/index.en-US.md
@@ -77,10 +77,10 @@ The following APIs are shared by DatePicker, RangePicker.
 
 ### Common Methods
 
-| Name | Description | Version |
-| --- | --- | --- |
-| blur() | Remove focus |  |
-| focus() | Get focus |  |
+| Name    | Description  | Version |
+| ------- | ------------ | ------- |
+| blur()  | Remove focus |         |
+| focus() | Get focus    |         |
 
 ### DatePicker
 
diff --git a/components/dropdown/__tests__/dropdown-button.test.js b/components/dropdown/__tests__/dropdown-button.test.js
index 80ed2586f4..8ddf1e4117 100644
--- a/components/dropdown/__tests__/dropdown-button.test.js
+++ b/components/dropdown/__tests__/dropdown-button.test.js
@@ -71,7 +71,9 @@ describe('DropdownButton', () => {
         <Menu.Item>foo</Menu.Item>
       </Menu>
     );
-    const wrapper = mount(<Dropdown.Button mouseEnterDelay={1} mouseLeaveDelay={2} overlay={menu} />);
+    const wrapper = mount(
+      <Dropdown.Button mouseEnterDelay={1} mouseLeaveDelay={2} overlay={menu} />,
+    );
     expect(wrapper.find('Dropdown').props().mouseEnterDelay).toBe(1);
     expect(wrapper.find('Dropdown').props().mouseLeaveDelay).toBe(2);
   });
diff --git a/components/dropdown/dropdown-button.tsx b/components/dropdown/dropdown-button.tsx
index 3d2f902baf..3a7ea15b5a 100644
--- a/components/dropdown/dropdown-button.tsx
+++ b/components/dropdown/dropdown-button.tsx
@@ -29,9 +29,11 @@ interface DropdownButtonInterface extends React.FC<DropdownButtonProps> {
 }
 
 const DropdownButton: DropdownButtonInterface = props => {
-  const { getPopupContainer: getContextPopupContainer, getPrefixCls, direction } = React.useContext(
-    ConfigContext,
-  );
+  const {
+    getPopupContainer: getContextPopupContainer,
+    getPrefixCls,
+    direction,
+  } = React.useContext(ConfigContext);
 
   const {
     prefixCls: customizePrefixCls,
diff --git a/components/layout/style/index.less b/components/layout/style/index.less
index 75b91938e2..86a912e70a 100644
--- a/components/layout/style/index.less
+++ b/components/layout/style/index.less
@@ -2,6 +2,7 @@
 @import '../../style/mixins/index';
 
 @layout-prefix-cls: ~'@{ant-prefix}-layout';
+@layout-menu-prefix-cls: ~'@{ant-prefix}-menu';
 
 .@{layout-prefix-cls} {
   display: flex;
@@ -66,6 +67,10 @@
       // https://github.com/ant-design/ant-design/issues/7967
       // solution from https://stackoverflow.com/a/33132624/3040605
       padding-top: 0.1px;
+
+      .@{layout-menu-prefix-cls}.@{layout-menu-prefix-cls}-inline-collapsed {
+        width: auto;
+      }
     }
 
     &-has-trigger {
diff --git a/components/mentions/__tests__/index.test.js b/components/mentions/__tests__/index.test.js
index 1139fce34f..d95963881c 100644
--- a/components/mentions/__tests__/index.test.js
+++ b/components/mentions/__tests__/index.test.js
@@ -81,14 +81,14 @@ describe('Mentions', () => {
   it('loading', () => {
     const wrapper = mount(<Mentions loading />);
     simulateInput(wrapper, '@');
-    expect(wrapper.find('.ant-mentions-dropdown-menu-item').length).toBe(1);
+    expect(wrapper.find('li.ant-mentions-dropdown-menu-item').length).toBe(1);
     expect(wrapper.find('.ant-spin').length).toBeTruthy();
   });
 
   it('notFoundContent', () => {
     const wrapper = mount(<Mentions notFoundContent={<span className="bamboo-light" />} />);
     simulateInput(wrapper, '@');
-    expect(wrapper.find('.ant-mentions-dropdown-menu-item').length).toBe(1);
+    expect(wrapper.find('li.ant-mentions-dropdown-menu-item').length).toBe(1);
     expect(wrapper.find('.bamboo-light').length).toBeTruthy();
   });
 });
diff --git a/components/menu/style/index.less b/components/menu/style/index.less
index 785b9bcbb4..b8956d2fc0 100644
--- a/components/menu/style/index.less
+++ b/components/menu/style/index.less
@@ -293,6 +293,7 @@
     }
 
     &-arrow {
+      // →
       &::before,
       &::after {
         position: absolute;
@@ -318,7 +319,9 @@
       color: @menu-highlight-color;
     }
 
+    .@{menu-prefix-cls}-inline-collapsed &-arrow,
     &-inline &-arrow {
+      // ↓
       &::before {
         transform: rotate(-45deg) translateX(2.5px);
       }
@@ -332,6 +335,7 @@
     }
 
     &-open&-inline > &-title > &-arrow {
+      // ↑
       transform: translateY(-2px);
       &::after {
         transform: rotate(-45deg) translateX(-2.5px);
@@ -509,10 +513,8 @@
     }
   }
 
-  &-inline-collapsed {
-    &:not(.@{ant-prefix}-layout-sider-children > ul) {
-      width: @menu-collapsed-width;
-    }
+  &&-inline-collapsed {
+    width: @menu-collapsed-width;
 
     > .@{menu-prefix-cls}-item,
     > .@{menu-prefix-cls}-item-group
@@ -526,8 +528,9 @@
       left: 0;
       padding: 0 ~'calc(50% - @{menu-icon-size-lg} / 2)';
       text-overflow: clip;
+
       .@{menu-prefix-cls}-submenu-arrow {
-        display: none;
+        opacity: 0;
       }
 
       .@{menu-prefix-cls}-item-icon,
@@ -537,7 +540,6 @@
         line-height: @menu-item-height;
         + span {
           display: inline-block;
-          // max-width: 0;
           opacity: 0;
         }
       }
diff --git a/package.json b/package.json
index 9fd46d96fb..fdd3ba51cc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "antd",
-  "version": "4.15.5",
+  "version": "4.16.0-alpha.2",
   "description": "An enterprise-class UI design language and React components implementation",
   "title": "Ant Design",
   "keywords": [
@@ -125,7 +125,7 @@
     "rc-field-form": "~1.20.0",
     "rc-image": "~5.2.4",
     "rc-input-number": "~7.1.0",
-    "rc-mentions": "~1.5.0",
+    "rc-mentions": "~1.6.0",
     "rc-menu": "~9.0.0-alpha.6",
     "rc-motion": "^2.4.0",
     "rc-notification": "~4.5.2",
@@ -139,7 +139,7 @@
     "rc-steps": "~4.1.0",
     "rc-switch": "~3.2.0",
     "rc-table": "~7.14.0",
-    "rc-tabs": "~11.7.0",
+    "rc-tabs": "~11.8.0",
     "rc-textarea": "~0.3.0",
     "rc-tooltip": "~5.1.1",
     "rc-tree": "~4.1.0",
diff --git a/scripts/check-commit.js b/scripts/check-commit.js
index 494f24c64a..71577cd333 100755
--- a/scripts/check-commit.js
+++ b/scripts/check-commit.js
@@ -24,7 +24,9 @@ async function checkVersion() {
 }
 
 async function checkBranch({ current }) {
-  if (current !== 'master' && current !== '4.0-prepare') {
+  if (version.includes('-alpha.')) {
+    console.log(chalk.cyan('😃 Alpha version. Skip branch check.'));
+  } else if (current !== 'master' && current !== '4.0-prepare') {
     console.log(chalk.yellow('🤔 You are not in the master branch!'));
     exitProcess();
   }