diff --git a/lib/utils/keycode-to-key.js b/lib/utils/keycode-to-key.js
index 365ae435d..cabf377d1 100644
--- a/lib/utils/keycode-to-key.js
+++ b/lib/utils/keycode-to-key.js
@@ -1,26 +1,26 @@
 // https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values
 /** @type { { [key: number]: string }  } */
 module.exports = {
-  '8': 'backspace',
-  '9': 'tab',
-  '13': 'enter',
-  '16': 'shift',
-  '17': 'ctrl',
-  '18': 'alt',
-  '19': 'pause', // windows
-  '20': 'caps-lock',
-  '27': 'escape',
-  '32': 'space', // Vue.js specially key name.
-  '33': 'page-up',
-  '34': 'page-down',
-  '35': 'end',
-  '36': 'home',
-  '37': 'arrow-left',
-  '38': 'arrow-up',
-  '39': 'arrow-right',
-  '40': 'arrow-down',
-  '45': 'insert', // windows
-  '46': 'delete',
+  8: 'backspace',
+  9: 'tab',
+  13: 'enter',
+  16: 'shift',
+  17: 'ctrl',
+  18: 'alt',
+  19: 'pause', // windows
+  20: 'caps-lock',
+  27: 'escape',
+  32: 'space', // Vue.js specially key name.
+  33: 'page-up',
+  34: 'page-down',
+  35: 'end',
+  36: 'home',
+  37: 'arrow-left',
+  38: 'arrow-up',
+  39: 'arrow-right',
+  40: 'arrow-down',
+  45: 'insert', // windows
+  46: 'delete',
 
   // If mistakenly use it in Vue.js 2.x, it will be irreversibly broken. Therefore, it will not be autofix.
   // '48': '0',
@@ -34,32 +34,32 @@ module.exports = {
   // '56': '8',
   // '57': '9',
 
-  '65': 'a',
-  '66': 'b',
-  '67': 'c',
-  '68': 'd',
-  '69': 'e',
-  '70': 'f',
-  '71': 'g',
-  '72': 'h',
-  '73': 'i',
-  '74': 'j',
-  '75': 'k',
-  '76': 'l',
-  '77': 'm',
-  '78': 'n',
-  '79': 'o',
-  '80': 'p',
-  '81': 'q',
-  '82': 'r',
-  '83': 's',
-  '84': 't',
-  '85': 'u',
-  '86': 'v',
-  '87': 'w',
-  '88': 'x',
-  '89': 'y',
-  '90': 'z',
+  65: 'a',
+  66: 'b',
+  67: 'c',
+  68: 'd',
+  69: 'e',
+  70: 'f',
+  71: 'g',
+  72: 'h',
+  73: 'i',
+  74: 'j',
+  75: 'k',
+  76: 'l',
+  77: 'm',
+  78: 'n',
+  79: 'o',
+  80: 'p',
+  81: 'q',
+  82: 'r',
+  83: 's',
+  84: 't',
+  85: 'u',
+  86: 'v',
+  87: 'w',
+  88: 'x',
+  89: 'y',
+  90: 'z',
 
   // The key value may change depending on the OS.
   // '91': 'meta' ,// Win: 'os'?
@@ -82,18 +82,18 @@ module.exports = {
   // '109': 'subtract',
   // '110': 'decimal',
   // '111': 'divide',
-  '112': 'f1',
-  '113': 'f2',
-  '114': 'f3',
-  '115': 'f4',
-  '116': 'f5',
-  '117': 'f6',
-  '118': 'f7',
-  '119': 'f8',
-  '120': 'f9',
-  '121': 'f10',
-  '122': 'f11',
-  '123': 'f12',
-  '144': 'num-lock',
-  '145': 'scroll-lock'
+  112: 'f1',
+  113: 'f2',
+  114: 'f3',
+  115: 'f4',
+  116: 'f5',
+  117: 'f6',
+  118: 'f7',
+  119: 'f8',
+  120: 'f9',
+  121: 'f10',
+  122: 'f11',
+  123: 'f12',
+  144: 'num-lock',
+  145: 'scroll-lock'
 }
diff --git a/package.json b/package.json
index 7bc47d2cb..22001b269 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,7 @@
     "lodash": "^4.17.15",
     "mocha": "^7.1.2",
     "nyc": "^15.0.1",
-    "prettier": "^2.0.5",
+    "prettier": "^2.1.1",
     "typescript": "^3.9.5",
     "vue-eslint-editor": "^1.1.0",
     "vuepress": "^1.4.1"