diff --git a/src/background/controllers/version.js b/src/background/controllers/version.js
new file mode 100644
index 0000000..04d99fe
--- /dev/null
+++ b/src/background/controllers/version.js
@@ -0,0 +1,11 @@
+import VersionInteractor from '../usecases/version';
+
+export default class VersionController {
+  constructor() {
+    this.versionInteractor = new VersionInteractor();
+  }
+
+  notifyIfUpdated() {
+    this.versionInteractor.notifyIfUpdated();
+  }
+}
diff --git a/src/background/index.js b/src/background/index.js
index 69dbe06..e753c48 100644
--- a/src/background/index.js
+++ b/src/background/index.js
@@ -5,25 +5,16 @@ import IndicatorComponent from 'background/components/indicator';
 import reducers from 'background/reducers';
 import { createStore, applyMiddleware } from 'redux';
 import promise from 'redux-promise';
-import * as versions from './shared/versions';
 
 import ContentMessageListener from './infrastructures/content-message-listener';
 import SettingController from './controllers/setting';
+import VersionRepository from './controllers/version';
 
 const store = createStore(
   reducers,
   applyMiddleware(promise),
 );
 
-const checkAndNotifyUpdated = async() => {
-  let updated = await versions.checkUpdated();
-  if (!updated) {
-    return;
-  }
-  await versions.notify();
-  await versions.commit();
-};
-
 /* eslint-disable no-unused-vars */
 const backgroundComponent = new BackgroundComponent(store);
 const operationComponent = new OperationComponent(store);
@@ -31,8 +22,7 @@ const tabComponent = new TabComponent(store);
 const indicatorComponent = new IndicatorComponent(store);
 /* eslint-enable no-unused-vars */
 
-checkAndNotifyUpdated();
-
 new SettingController().reload();
+new VersionRepository().notifyIfUpdated();
 
 new ContentMessageListener().run();
diff --git a/src/background/infrastructures/notifier.js b/src/background/infrastructures/notifier.js
new file mode 100644
index 0000000..1eccc47
--- /dev/null
+++ b/src/background/infrastructures/notifier.js
@@ -0,0 +1,23 @@
+const NOTIFICATION_ID = 'vimvixen-update';
+
+export default class Notifier {
+  notify(title, message, onclick) {
+    const listener = (id) => {
+      if (id !== NOTIFICATION_ID) {
+        return;
+      }
+
+      onclick();
+
+      browser.notifications.onClicked.removeListener(listener);
+    };
+    browser.notifications.onClicked.addListener(listener);
+
+    return browser.notifications.create(NOTIFICATION_ID, {
+      'type': 'basic',
+      'iconUrl': browser.extension.getURL('resources/icon_48x48.png'),
+      title,
+      message,
+    });
+  }
+}
diff --git a/src/background/repositories/tab.js b/src/background/repositories/tab.js
new file mode 100644
index 0000000..16989e1
--- /dev/null
+++ b/src/background/repositories/tab.js
@@ -0,0 +1,5 @@
+export default class TabRepository {
+  create(url) {
+    browser.tabs.create({ url, });
+  }
+}
diff --git a/src/background/repositories/version.js b/src/background/repositories/version.js
new file mode 100644
index 0000000..4c71d05
--- /dev/null
+++ b/src/background/repositories/version.js
@@ -0,0 +1,10 @@
+export default class VersionRepository {
+  async get() {
+    let { version } = await browser.storage.local.get('version');
+    return version;
+  }
+
+  update(version) {
+    return browser.storage.local.set({ version });
+  }
+}
diff --git a/src/background/shared/versions/index.js b/src/background/shared/versions/index.js
deleted file mode 100644
index aa09c92..0000000
--- a/src/background/shared/versions/index.js
+++ /dev/null
@@ -1,38 +0,0 @@
-import * as storage from './storage';
-import * as releaseNotes from './release-notes';
-import manifest from '../../../../manifest.json';
-
-const NOTIFICATION_ID = 'vimvixen-update';
-
-const notificationClickListener = (id) => {
-  if (id !== NOTIFICATION_ID) {
-    return;
-  }
-
-  browser.tabs.create({ url: releaseNotes.url(manifest.version) });
-  browser.notifications.onClicked.removeListener(notificationClickListener);
-};
-
-const checkUpdated = async() => {
-  let prev = await storage.load();
-  if (!prev) {
-    return true;
-  }
-  return manifest.version !== prev;
-};
-
-const notify = () => {
-  browser.notifications.onClicked.addListener(notificationClickListener);
-  return browser.notifications.create(NOTIFICATION_ID, {
-    'type': 'basic',
-    'iconUrl': browser.extension.getURL('resources/icon_48x48.png'),
-    'title': 'Vim Vixen ' + manifest.version + ' has been installed',
-    'message': 'Click here to see release notes',
-  });
-};
-
-const commit = () => {
-  storage.save(manifest.version);
-};
-
-export { checkUpdated, notify, commit };
diff --git a/src/background/shared/versions/release-notes.js b/src/background/shared/versions/release-notes.js
deleted file mode 100644
index 6ef2335..0000000
--- a/src/background/shared/versions/release-notes.js
+++ /dev/null
@@ -1,8 +0,0 @@
-const url = (version) => {
-  if (version) {
-    return 'https://github.com/ueokande/vim-vixen/releases/tag/' + version;
-  }
-  return 'https://github.com/ueokande/vim-vixen/releases/';
-};
-
-export { url };
diff --git a/src/background/shared/versions/storage.js b/src/background/shared/versions/storage.js
deleted file mode 100644
index 7883258..0000000
--- a/src/background/shared/versions/storage.js
+++ /dev/null
@@ -1,10 +0,0 @@
-const load = async() => {
-  let { version } = await browser.storage.local.get('version');
-  return version;
-};
-
-const save = (version) => {
-  return browser.storage.local.set({ version });
-};
-
-export { load, save };
diff --git a/src/background/usecases/version.js b/src/background/usecases/version.js
new file mode 100644
index 0000000..a681bdf
--- /dev/null
+++ b/src/background/usecases/version.js
@@ -0,0 +1,41 @@
+import manifest from '../../../manifest.json';
+import VersionRepository from '../repositories/version';
+import TabRepository from '../repositories/tab';
+import Notifier from '../infrastructures/notifier';
+
+export default class VersionInteractor {
+  constructor() {
+    this.versionRepository = new VersionRepository();
+    this.tabRepository = new TabRepository();
+    this.notifier = new Notifier();
+  }
+
+  async notifyIfUpdated() {
+    if (!await this.checkUpdated()) {
+      return;
+    }
+
+    let title = 'Vim Vixen ' + manifest.version + ' has been installed';
+    let message = 'Click here to see release notes';
+    this.notifier.notify(title, message, () => {
+      let url = this.releaseNoteUrl(manifest.version);
+      this.tabRepository.create(url);
+    });
+    this.versionRepository.update(manifest.version);
+  }
+
+  async checkUpdated() {
+    let prev = await this.versionRepository.get();
+    if (!prev) {
+      return true;
+    }
+    return manifest.version !== prev;
+  }
+
+  releaseNoteUrl(version) {
+    if (version) {
+      return 'https://github.com/ueokande/vim-vixen/releases/tag/' + version;
+    }
+    return 'https://github.com/ueokande/vim-vixen/releases/';
+  }
+}
diff --git a/test/background/shared/versions/storage.test.js b/test/background/repositories/version.js
similarity index 60%
rename from test/background/shared/versions/storage.test.js
rename to test/background/repositories/version.js
index f452516..8510ae6 100644
--- a/test/background/shared/versions/storage.test.js
+++ b/test/background/repositories/version.js
@@ -1,14 +1,20 @@
-import * as storage from 'background/shared/versions/storage';
+import VersionRepository from 'background/repositories/version';
 
-describe("shared/versions/storage", () => {
-  describe('#load', () => {
+describe("background/repositories/version", () => {
+  let versionRepository;
+
+  beforeEach(() => {
+    versionRepository = new VersionRepository;
+  });
+
+  describe('#get', () => {
     beforeEach(() => {
       return browser.storage.local.remove('version');
     });
 
     it('loads saved version', async() => {
       await browser.storage.local.set({ version: '1.2.3' });
-      let version = await storage.load();
+      let version = await this.versionRepository.get();
       expect(version).to.equal('1.2.3');
     });
 
@@ -18,9 +24,9 @@ describe("shared/versions/storage", () => {
     });
   });
 
-  describe('#save', () => {
+  describe('#update', () => {
     it('saves version string', async() => {
-      await storage.save('2.3.4');
+      await versionRepository.update('2.3.4');
       let { version } = await browser.storage.local.get('version');
       expect(version).to.equal('2.3.4');
     });
diff --git a/test/background/shared/versions/index.test.js b/test/background/shared/versions/index.test.js
deleted file mode 100644
index d65dd9a..0000000
--- a/test/background/shared/versions/index.test.js
+++ /dev/null
@@ -1,40 +0,0 @@
-import * as versions from 'background/shared/versions';
-import manifest from '../../../../manifest.json';
-
-describe("shared/versions/storage", () => {
-  describe('#checkUpdated', () => {
-    beforeEach(() => {
-      return browser.storage.local.remove('version');
-    });
-
-    it('return true if no previous versions', async() => {
-      let updated = await versions.checkUpdated();
-      expect(updated).to.be.true;
-    });
-
-    it('return true if updated', async() => {
-      await browser.storage.local.set({ version: '0.001' });
-      let updated = await versions.checkUpdated();
-      expect(updated).to.be.true;
-    });
-
-    it('return false if not updated', async() => {
-      await browser.storage.local.set({ version: manifest.version });
-      let updated = await versions.checkUpdated();
-      expect(updated).to.be.false;
-    });
-  });
-
-  describe('#commit', () => {
-    beforeEach(() => {
-      return browser.storage.local.remove('version');
-    });
-
-    it('saves current version from manifest.json', async() => {
-      await versions.commit();
-      let { version } = await browser.storage.local.get('version');
-      expect(version).to.be.a('string');
-      expect(version).to.equal(manifest.version);
-    });
-  });
-});