diff --git a/src/main/config/app.ts b/src/main/config/app.ts
index c90216e..884b927 100644
--- a/src/main/config/app.ts
+++ b/src/main/config/app.ts
@@ -9,7 +9,13 @@ let appConfig: IAppConfig // config.yaml
 export async function getAppConfig(force = false): Promise<IAppConfig> {
   if (force || !appConfig) {
     const data = await readFile(appConfigPath(), 'utf-8')
-    appConfig = parse(data) || defaultConfig
+    const parsedConfig = parse(data)
+    const mergedConfig = deepMerge({ ...defaultConfig }, parsedConfig || {})
+    if (JSON.stringify(mergedConfig) !== JSON.stringify(parsedConfig)) {
+      await writeFile(appConfigPath(), stringify(mergedConfig))
+    }
+
+    appConfig = mergedConfig
   }
   if (typeof appConfig !== 'object') appConfig = defaultConfig
   return appConfig