diff --git a/locales/ja.yml b/locales/ja.yml
index fc790d8c5381425f4274637bf1283b2ad3c908bb..9c517435264250a75f95121e93c0ec529f12f4a7 100644
--- a/locales/ja.yml
+++ b/locales/ja.yml
@@ -1092,7 +1092,4 @@ docs:
     props:
       name: "名前"
       type: "åž‹"
-      optional: "オプション"
       description: "説明"
-      yes: "はい"
-      no: "いいえ"
diff --git a/package.json b/package.json
index 3663d42c4b35d32c67a382596cdc4762f70ac3b9..2bd8dc6f44be31bcdd07614a5c135a8c46213134 100644
--- a/package.json
+++ b/package.json
@@ -89,7 +89,7 @@
 		"autwh": "0.1.0",
 		"bcryptjs": "2.4.3",
 		"bootstrap-vue": "2.0.0-rc.11",
-		"cafy": "11.1.0",
+		"cafy": "11.2.0",
 		"chalk": "2.4.1",
 		"crc-32": "1.2.0",
 		"css-loader": "0.28.11",
diff --git a/src/client/docs/api/mixins.pug b/src/client/docs/api/mixins.pug
index 6762158f8636fcdb55d30fecce7ceb79e539454d..79665a61e3c2f9c0a6ee985a058526e16c45031c 100644
--- a/src/client/docs/api/mixins.pug
+++ b/src/client/docs/api/mixins.pug
@@ -3,7 +3,6 @@ mixin propTable(props)
 		thead: tr
 			th= i18n('docs.api.props.name')
 			th= i18n('docs.api.props.type')
-			th= i18n('docs.api.props.optional')
 			th= i18n('docs.api.props.description')
 		tbody
 			each prop in props
@@ -29,9 +28,4 @@ mixin propTable(props)
 								| )
 						else if prop.kind == 'date'
 							|  (Date)
-					td.optional
-						if prop.optional
-							= i18n('docs.api.props.yes')
-						else
-							= i18n('docs.api.props.no')
 					td.desc!= prop.desc ? prop.desc[lang] || prop.desc['ja'] : null