diff --git a/package.json b/package.json
index fa272e2..95ccd44 100644
--- a/package.json
+++ b/package.json
@@ -629,6 +629,6 @@
     "which": "^2.0.2"
   },
   "dependencies": {
-    "typescript": "3.9.7"
+    "typescript": "4.0.3"
   }
 }
diff --git a/src/server/features/refactor.ts b/src/server/features/refactor.ts
index cdebfa4..3371b7f 100644
--- a/src/server/features/refactor.ts
+++ b/src/server/features/refactor.ts
@@ -12,6 +12,12 @@ import { ITypeScriptServiceClient } from '../typescriptService'
 import * as typeConverters from '../utils/typeConverters'
 import FormattingOptionsManager from './fileConfigurationManager'
 
+namespace Experimental {
+  export interface RefactorActionInfo extends Proto.RefactorActionInfo {
+    readonly notApplicableReason?: string
+  }
+}
+
 class ApplyRefactoringCommand implements Command {
   public static readonly ID = '_typescript.applyRefactoring'
   public readonly id = ApplyRefactoringCommand.ID
@@ -142,7 +148,8 @@ export default class TypeScriptRefactorProvider implements CodeActionProvider {
       response.body,
       document,
       file,
-      range
+      range,
+      context.only && context.only.some(v => v.includes(CodeActionKind.Refactor))
     )
   }
 
@@ -150,10 +157,13 @@ export default class TypeScriptRefactorProvider implements CodeActionProvider {
     body: Proto.ApplicableRefactorInfo[],
     document: TextDocument,
     file: string,
-    rangeOrSelection: Range
+    rangeOrSelection: Range,
+    setPrefrred: boolean
   ): CodeAction[] {
     const actions: CodeAction[] = []
     for (const info of body) {
+      // ignore not refactor that not applicable
+      if ((info as Experimental.RefactorActionInfo).notApplicableReason) continue
       if (!info.inlineable) {
         const codeAction: CodeAction = {
           title: info.description,
@@ -167,15 +177,11 @@ export default class TypeScriptRefactorProvider implements CodeActionProvider {
         actions.push(codeAction)
       } else {
         for (const action of info.actions) {
-          actions.push(
-            this.refactorActionToCodeAction(
-              action,
-              document,
-              file,
-              info,
-              rangeOrSelection
-            )
-          )
+          let codeAction = this.refactorActionToCodeAction(action, document, file, info, rangeOrSelection)
+          if (setPrefrred) {
+            codeAction.isPreferred = TypeScriptRefactorProvider.isPreferred(action, info.actions)
+          }
+          actions.push(codeAction)
         }
       }
     }
@@ -204,7 +210,7 @@ export default class TypeScriptRefactorProvider implements CodeActionProvider {
   private shouldTrigger(context: CodeActionContext): boolean {
     if (
       context.only &&
-      context.only.indexOf(CodeActionKind.Refactor) == -1
+      context.only.every(o => !o.includes(CodeActionKind.Refactor))
     ) {
       return false
     }
@@ -221,4 +227,34 @@ export default class TypeScriptRefactorProvider implements CodeActionProvider {
     }
     return CodeActionKind.Refactor
   }
+
+  private static isPreferred(
+    action: Proto.RefactorActionInfo,
+    allActions: readonly Proto.RefactorActionInfo[],
+  ): boolean {
+    let kind = TypeScriptRefactorProvider.getKind(action)
+    if (TypeScriptRefactorProvider.extractConstantKind == kind) {
+      // Only mark the action with the lowest scope as preferred
+      const getScope = (name: string) => {
+        const scope = name.match(/scope_(\d)/)?.[1]
+        return scope ? +scope : undefined
+      }
+      const scope = getScope(action.name)
+      if (typeof scope !== 'number') {
+        return false
+      }
+
+      return allActions
+        .filter(otherAtion => otherAtion !== action && otherAtion.name.startsWith('constant_'))
+        .every(otherAction => {
+          const otherScope = getScope(otherAction.name)
+          return typeof otherScope === 'number' ? scope < otherScope : true
+        })
+    }
+    let { name } = action
+    if (name.startsWith('Extract to type alias') || name.startsWith('Extract to interface')) {
+      return true
+    }
+    return false
+  }
 }
diff --git a/src/server/utils/api.ts b/src/server/utils/api.ts
index 2c3f29e..c3bb9ba 100644
--- a/src/server/utils/api.ts
+++ b/src/server/utils/api.ts
@@ -38,6 +38,8 @@ export default class API {
   public static readonly v380 = API.fromSimpleString('3.8.0')
   public static readonly v381 = API.fromSimpleString('3.8.1')
   public static readonly v390 = API.fromSimpleString('3.9.0')
+  public static readonly v400 = API.fromSimpleString('4.0.0')
+  public static readonly v401 = API.fromSimpleString('4.0.1');
 
   public static fromVersionString(versionString: string): API {
     let version = semver.valid(versionString)
diff --git a/yarn.lock b/yarn.lock
index d4fd3aa..9043ab9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3139,10 +3139,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@3.9.7:
-  version "3.9.7"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.7.tgz#98d600a5ebdc38f40cb277522f12dc800e9e25fa"
-  integrity sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==
+typescript@4.0.3:
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.0.3.tgz#153bbd468ef07725c1df9c77e8b453f8d36abba5"
+  integrity sha512-tEu6DGxGgRJPb/mVPIZ48e69xCn2yRmCgYmDugAVwmJ6o+0u1RI18eO7E7WBTLYLaEVVOhwQmcdhQHweux/WPg==
 
 union-value@^1.0.0:
   version "1.0.1"