diff --git a/spec/config/i18n.spec.ts b/spec/config/i18n.spec.ts
index 908724cf..f926f6f9 100644
--- a/spec/config/i18n.spec.ts
+++ b/spec/config/i18n.spec.ts
@@ -6,7 +6,7 @@ const locales = ['de', 'fr', 'it', 'ja', 'ko', 'pl', 'zh_cn']
 
 describe('i18n', () => {
   describe('should not define duplicate keys', () => {
-    locales.map(locale => {
+    locales.forEach(locale => {
       it(`${locale} translation`, () => {
         const targetJson = JSON.parse(
           fs.readFileSync(path.resolve(__dirname, `../../src/config/locales/${locale}/translation.json`), 'utf8')
diff --git a/src/main/index.ts b/src/main/index.ts
index ca712ec9..811dbf6e 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -663,7 +663,7 @@ ipcMain.on('start-all-user-streamings', (event: IpcMainEvent, accounts: Array<Lo
 })
 
 ipcMain.on('stop-all-user-streamings', () => {
-  Object.keys(userStreamings).map((key: string) => {
+  Object.keys(userStreamings).forEach((key: string) => {
     if (userStreamings[key]) {
       userStreamings[key]!.stop()
       userStreamings[key] = null
@@ -676,7 +676,7 @@ ipcMain.on('stop-all-user-streamings', () => {
  * @param id specified user id in nedb.
  */
 const stopUserStreaming = (id: string) => {
-  Object.keys(userStreamings).map((key: string) => {
+  Object.keys(userStreamings).forEach((key: string) => {
     if (key === id && userStreamings[id]) {
       userStreamings[id]!.stop()
       userStreamings[id] = null
diff --git a/src/renderer/store/TimelineSpace/Modals/NewToot.ts b/src/renderer/store/TimelineSpace/Modals/NewToot.ts
index cc2b5ec3..a7356a09 100644
--- a/src/renderer/store/TimelineSpace/Modals/NewToot.ts
+++ b/src/renderer/store/TimelineSpace/Modals/NewToot.ts
@@ -234,7 +234,7 @@ const actions: ActionTree<NewTootState, RootState> = {
     }
 
     if (params.polls.length > 1) {
-      params.polls.map(poll => {
+      params.polls.forEach(poll => {
         if (poll.length < 1) {
           throw new NewTootPollInvalid()
         }
@@ -297,7 +297,7 @@ const actions: ActionTree<NewTootState, RootState> = {
     commit(MUTATION_TYPES.UPDATE_INITIAL_SPOILER, message.spoiler_text)
     commit(MUTATION_TYPES.CHANGE_MODAL, true)
     let value: number = Visibility.Public.value
-    Object.keys(Visibility).map(key => {
+    Object.keys(Visibility).forEach(key => {
       const target = Visibility[key]
       if (target.key === message.visibility) {
         value = target.value