diff --git a/backend/src/index.ts b/backend/src/index.ts
index 9e78efb..e37aadd 100644
--- a/backend/src/index.ts
+++ b/backend/src/index.ts
@@ -57,6 +57,11 @@ export class ConnectionManager {
     connection.disconnect()
     delete this.connections[hash]
   }
+
+  public closeAllConnections() {
+    Object.keys(this.connections)
+      .forEach(hash => this.removeConnection(hash))
+  }
 }
 
 class UpdateNotifier {
diff --git a/electron.js b/electron.js
index c2556ae..e298cbb 100644
--- a/electron.js
+++ b/electron.js
@@ -30,6 +30,11 @@ function createWindow () {
   // Open the DevTools.
   // mainWindow.webContents.openDevTools()
 
+  // Emitted when the window is closed.
+  mainWindow.on('close', function () {
+    connectionManager.closeAllConnections()
+  })
+
   // Emitted when the window is closed.
   mainWindow.on('closed', function () {
     // Dereference the window object, usually you would store windows