diff --git a/package-lock.json b/package-lock.json
index d53826b0..6a056ebc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,34 +1,34 @@
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-      "integrity": "sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==",
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.1.3.tgz",
+      "integrity": "sha512-B3ZIOf1IKeH2ixgHhj6la6xdwR9QrLC5d1VKeCSY4tvkqhF2eqd9O7txNlS0PO3GrBAFIdr3L1ndNwteUbZLYg==",
       "dev": true
     },
     "uglify-js": {
-      "version": "3.10.0",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.10.0.tgz",
-      "integrity": "sha512-Esj5HG5WAyrLIdYU74Z3JdG2PxdIusvj6IWHMtlyESxc7kcDz7zYlYjpnSokn1UbpV0d/QX9fan7gkCNd/9BQA==",
+      "version": "3.12.4",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.12.4.tgz",
+      "integrity": "sha512-L5i5jg/SHkEqzN18gQMTWsZk3KelRsfD1wUVNqtq0kzqWQqcJjyL8yc1o8hJgRrWqrAl2mUFbhfznEIoi7zi2A==",
       "dev": true,
       "optional": true
     },
     "universalify": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
-      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-1.0.0.tgz",
+      "integrity": "sha512-rb6X1W158d7pRQBg5gkR8uPaSfiids68LTJQYOtEUhoJUWBdaQHsuT/EUduxXYxcrt4r5PJ4fuHW1MHT6p0qug==",
+      "dev": true
+    },
+    "vscode-textmate": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/vscode-textmate/-/vscode-textmate-5.2.0.tgz",
+      "integrity": "sha512-Uw5ooOQxRASHgu6C7GVvUxisKXfSgW4oFlO+aa+PAkgmH89O3CXxEEzNRNtHSqtXFTl0nAC1uYj0GMSH27uwtQ==",
       "dev": true
     },
     "which": {
@@ -1142,6 +1222,12 @@
       "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
       "dev": true
     },
+    "yallist": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
+      "dev": true
+    },
     "yargs": {
       "version": "13.3.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
diff --git a/package.json b/package.json
index 1fc2f097..1c6a9f67 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "node-kakao",
-  "version": "3.1.7",
+  "version": "3.1.8",
   "description": "Loco protocol compatible library",
   "main": "dist/index.js",
   "scripts": {
@@ -20,20 +20,20 @@
   "devDependencies": {
     "@types/bson": "^4.0.0",
     "@types/chai": "^4.2.3",
-    "@types/mocha": "^5.2.7",
-    "@types/node": "^12.7.11",
+    "@types/mocha": "^8.2.0",
+    "@types/node": "^14.14.20",
     "chai": "^4.2.0",
     "mocha": "^6.2.1",
     "ts-node": "^8.4.1",
-    "typedoc": "^0.17.8",
-    "typescript": "^3.9.6"
+    "typedoc": "^0.20.13",
+    "typescript": "^4.1.3"
   },
   "repository": {
     "type": "git",
     "url": "https://github.com/storycraft/node-kakao.git"
   },
   "dependencies": {
-    "axios": "^0.19.2",
+    "axios": "^0.21.1",
     "bson": "^4.0.2",
     "form-data": "^3.0.0",
     "json-proxy-mapper": "^1.1.2",
diff --git a/src/talk/managed/managed-chat-user.ts b/src/talk/managed/managed-chat-user.ts
index 257100d1..ae743c1d 100644
--- a/src/talk/managed/managed-chat-user.ts
+++ b/src/talk/managed/managed-chat-user.ts
@@ -87,7 +87,7 @@ export class ManagedChatUserInfo implements ChatUserInfo {
     }
 
     updateNickname(nickname: string) {
-        if (this.memberStruct.nickname !== nickname) {
+        if (nickname && this.memberStruct.nickname !== nickname) {
             this.memberStruct.nickname = nickname;
         }
     }
@@ -168,4 +168,4 @@ export class ManagedOpenChatUserInfo implements OpenChatUserInfo {
         this.memberStruct.memberType = memberType;
     }
 
-}
\ No newline at end of file
+}
diff --git a/typedoc.json b/typedoc.json
index 0385ecf7..739ae725 100644
--- a/typedoc.json
+++ b/typedoc.json
@@ -1,10 +1,8 @@
 {
-    "mode": "file",
     "out": "docs",
     "excludeExternals": true,
     "excludeProtected": false,
-    "excludeNotExported": true,
     "excludePrivate": false,
     "name": "NodeKakao",
     "includeVersion": true
-}
\ No newline at end of file
+}