diff --git a/README.md b/README.md
index 7a10f5b81..197fd6952 100644
--- a/README.md
+++ b/README.md
@@ -44,9 +44,6 @@ If you want to...
 
 :heart: Backers & Sponsors
 ----------------------------------------------------------------
-[![Backers][backers-image]][support-url]
-[![Sponsors][sponsors-image]][support-url]
-
 | ![][nagarus-icon] | ![][dansup-icon] |
 |:-:|:-:|
 | [nagarus][nagarus-link] | [dansup][dansup-link] |
diff --git a/package.json b/package.json
index 7c84161a9..a9ae2ba59 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,8 @@
 {
 	"name": "misskey",
 	"author": "syuilo <i@syuilo.com>",
-	"version": "4.14.0",
-	"clientVersion": "1.0.6815",
+	"version": "4.15.0",
+	"clientVersion": "1.0.6878",
 	"codename": "nighthike",
 	"main": "./built/index.js",
 	"private": true,
@@ -63,9 +63,9 @@
 		"@types/license-checker": "15.0.0",
 		"@types/mkdirp": "0.5.2",
 		"@types/mocha": "5.2.3",
-		"@types/mongodb": "3.0.21",
+		"@types/mongodb": "3.1.0",
 		"@types/ms": "0.7.30",
-		"@types/node": "10.3.6",
+		"@types/node": "10.5.1",
 		"@types/nopt": "3.0.29",
 		"@types/parse5": "5.0.0",
 		"@types/pug": "2.0.4",
@@ -80,7 +80,7 @@
 		"@types/speakeasy": "2.0.2",
 		"@types/tmp": "0.0.33",
 		"@types/uuid": "3.4.3",
-		"@types/webpack": "4.4.3",
+		"@types/webpack": "4.4.4",
 		"@types/webpack-stream": "3.2.10",
 		"@types/websocket": "0.0.39",
 		"@types/ws": "5.1.2",
@@ -99,7 +99,7 @@
 		"diskusage": "0.2.4",
 		"dompurify": "1.0.5",
 		"elasticsearch": "15.0.0",
-		"element-ui": "2.4.1",
+		"element-ui": "2.4.2",
 		"emojilib": "2.2.12",
 		"escape-regexp": "0.0.1",
 		"eslint": "5.0.1",
@@ -124,7 +124,7 @@
 		"gulp-typescript": "4.0.2",
 		"gulp-uglify": "3.0.0",
 		"gulp-util": "3.0.8",
-		"hard-source-webpack-plugin": "0.9.0",
+		"hard-source-webpack-plugin": "0.10.1",
 		"highlight.js": "9.12.0",
 		"html-minifier": "3.5.17",
 		"http-signature": "1.2.0",
@@ -152,7 +152,7 @@
 		"mkdirp": "0.5.1",
 		"mocha": "5.2.0",
 		"moji": "0.5.1",
-		"mongodb": "3.0.10",
+		"mongodb": "3.1.0",
 		"monk": "6.0.6",
 		"ms": "2.1.1",
 		"nan": "2.10.0",
@@ -196,14 +196,14 @@
 		"ts-node": "7.0.0",
 		"tslint": "5.10.0",
 		"typescript": "2.9.2",
-		"typescript-eslint-parser": "16.0.0",
+		"typescript-eslint-parser": "16.0.1",
 		"uglify-es": "3.3.9",
 		"url-loader": "1.0.1",
-		"uuid": "3.3.0",
+		"uuid": "3.3.2",
 		"v-animate-css": "0.0.2",
 		"vue": "2.5.16",
 		"vue-cropperjs": "2.2.1",
-		"vue-js-modal": "1.3.15",
+		"vue-js-modal": "1.3.16",
 		"vue-json-tree-view": "2.1.4",
 		"vue-loader": "15.2.4",
 		"vue-router": "3.0.1",
@@ -213,7 +213,7 @@
 		"vuex-persistedstate": "^2.5.4",
 		"web-push": "3.3.2",
 		"webfinger.js": "2.6.6",
-		"webpack": "4.12.1",
+		"webpack": "4.14.0",
 		"webpack-cli": "3.0.8",
 		"websocket": "1.0.26",
 		"ws": "5.2.1",
diff --git a/src/client/app/common/scripts/get-kao.ts b/src/client/app/common/scripts/get-kao.ts
index d38018751..645196132 100644
--- a/src/client/app/common/scripts/get-kao.ts
+++ b/src/client/app/common/scripts/get-kao.ts
@@ -1,5 +1,5 @@
 export default () => [
 	'(=^・・^=)',
-	'v('ω')v',
+	'v(\'ω\')v',
 	'🐡( \'-\' 🐡 )ﾌｸﾞﾊﾟﾝﾁ!!!!'
 ][Math.floor(Math.random() * 3)];
diff --git a/src/mfm/html.ts b/src/mfm/html.ts
index 64208af88..71b473947 100644
--- a/src/mfm/html.ts
+++ b/src/mfm/html.ts
@@ -92,6 +92,10 @@ const handlers: { [key: string]: (window: any, token: any, mentionedRemoteUsers:
 };
 
 export default (tokens: TextElement[], mentionedRemoteUsers: INote['mentionedRemoteUsers'] = []) => {
+	if (tokens == null) {
+		return null;
+	}
+
 	const { window } = new JSDOM('');
 
 	for (const token of tokens) {
diff --git a/src/mfm/parse/index.ts b/src/mfm/parse/index.ts
index 2b6a459b1..8d71409e5 100644
--- a/src/mfm/parse/index.ts
+++ b/src/mfm/parse/index.ts
@@ -43,8 +43,7 @@ export type TextElement = { type: 'text', content: string }
 export type TextElementProcessor = (text: string, i: number) => TextElement | TextElement[];
 
 export default (source: string): TextElement[] => {
-
-	if (source == '') {
+	if (source == null || source == '') {
 		return null;
 	}
 
diff --git a/src/remote/activitypub/models/person.ts b/src/remote/activitypub/models/person.ts
index 94a6cee0b..83afd6826 100644
--- a/src/remote/activitypub/models/person.ts
+++ b/src/remote/activitypub/models/person.ts
@@ -52,7 +52,7 @@ export async function createPerson(value: any, resolver?: Resolver): Promise<IUs
 	}
 
 	if (object.type != 'Person' && object.type != 'Service') {
-		throw new Error('invalid person: object is not a person or service');
+		throw new Error(`invalid person: object is not a person or service '${object.type}'`);
 	}
 
 	if (typeof object.preferredUsername !== 'string') {
diff --git a/src/server/api/endpoints.ts b/src/server/api/endpoints.ts
index f613710c8..146de6725 100644
--- a/src/server/api/endpoints.ts
+++ b/src/server/api/endpoints.ts
@@ -509,7 +509,7 @@ const endpoints: Endpoint[] = [
 		withCredential: true,
 		limit: {
 			duration: ms('1hour'),
-			max: 120,
+			max: 300,
 			minInterval: ms('1second')
 		},
 		kind: 'note-write'