diff --git a/app/src/main/java/me/ash/reader/App.kt b/app/src/main/java/me/ash/reader/App.kt
index 3c99daa..a6879d4 100644
--- a/app/src/main/java/me/ash/reader/App.kt
+++ b/app/src/main/java/me/ash/reader/App.kt
@@ -6,16 +6,15 @@ import androidx.work.Configuration
 import androidx.work.WorkManager
 import dagger.hilt.android.HiltAndroidApp
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import me.ash.reader.data.module.ApplicationScope
 import me.ash.reader.data.repository.*
 import me.ash.reader.data.source.OpmlLocalDataSource
 import me.ash.reader.data.source.ReaderDatabase
 import me.ash.reader.data.source.RssNetworkDataSource
 import javax.inject.Inject
 
-@DelicateCoroutinesApi
 @HiltAndroidApp
 class App : Application(), Configuration.Provider {
     @Inject
@@ -54,7 +53,9 @@ class App : Application(), Configuration.Provider {
     @Inject
     lateinit var rssRepository: RssRepository
 
-    private val applicationScope = CoroutineScope(Dispatchers.Default)
+    @Inject
+    @ApplicationScope
+    lateinit var applicationScope: CoroutineScope
 
     override fun onCreate() {
         super.onCreate()
diff --git a/app/src/main/java/me/ash/reader/data/module/CoroutineDispatcherModule.kt b/app/src/main/java/me/ash/reader/data/module/CoroutineDispatcherModule.kt
new file mode 100644
index 0000000..ea39da8
--- /dev/null
+++ b/app/src/main/java/me/ash/reader/data/module/CoroutineDispatcherModule.kt
@@ -0,0 +1,29 @@
+package me.ash.reader.data.module
+
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+
+@Module
+@InstallIn(SingletonComponent::class)
+object CoroutineDispatcherModule {
+
+    @Provides
+    @DispatcherDefault
+    fun provideDispatcherDefault(): CoroutineDispatcher = Dispatchers.Default
+
+    @Provides
+    @DispatcherIO
+    fun provideDispatcherIO(): CoroutineDispatcher = Dispatchers.IO
+
+    @Provides
+    @DispatcherMain
+    fun provideDispatcherMain(): CoroutineDispatcher = Dispatchers.Main
+
+    @Provides
+    @DispatcherMainImmediate
+    fun provideDispatcherMainImmediate(): CoroutineDispatcher = Dispatchers.Main.immediate
+}
diff --git a/app/src/main/java/me/ash/reader/data/module/CoroutineQualifier.kt b/app/src/main/java/me/ash/reader/data/module/CoroutineQualifier.kt
new file mode 100644
index 0000000..e24d9cf
--- /dev/null
+++ b/app/src/main/java/me/ash/reader/data/module/CoroutineQualifier.kt
@@ -0,0 +1,19 @@
+package me.ash.reader.data.module
+
+import javax.inject.Qualifier
+
+@Retention(AnnotationRetention.RUNTIME)
+@Qualifier
+annotation class DispatcherDefault
+
+@Retention(AnnotationRetention.RUNTIME)
+@Qualifier
+annotation class DispatcherIO
+
+@Retention(AnnotationRetention.RUNTIME)
+@Qualifier
+annotation class DispatcherMain
+
+@Retention(AnnotationRetention.BINARY)
+@Qualifier
+annotation class DispatcherMainImmediate
\ No newline at end of file
diff --git a/app/src/main/java/me/ash/reader/data/module/CoroutineScopeModule.kt b/app/src/main/java/me/ash/reader/data/module/CoroutineScopeModule.kt
new file mode 100644
index 0000000..543fdae
--- /dev/null
+++ b/app/src/main/java/me/ash/reader/data/module/CoroutineScopeModule.kt
@@ -0,0 +1,27 @@
+package me.ash.reader.data.module
+
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.SupervisorJob
+import javax.inject.Qualifier
+import javax.inject.Singleton
+
+@Retention(AnnotationRetention.RUNTIME)
+@Qualifier
+annotation class ApplicationScope
+
+@Module
+@InstallIn(SingletonComponent::class)
+object CoroutineScopeModule {
+
+    @Provides
+    @Singleton
+    @ApplicationScope
+    fun provideCoroutineScope(
+        @DispatcherDefault dispatcherDefault: CoroutineDispatcher
+    ): CoroutineScope = CoroutineScope(SupervisorJob() + dispatcherDefault)
+}
\ No newline at end of file
diff --git a/app/src/main/java/me/ash/reader/data/module/DatabaseModule.kt b/app/src/main/java/me/ash/reader/data/module/DatabaseModule.kt
index 9dbf38a..1922e64 100644
--- a/app/src/main/java/me/ash/reader/data/module/DatabaseModule.kt
+++ b/app/src/main/java/me/ash/reader/data/module/DatabaseModule.kt
@@ -15,20 +15,25 @@ import javax.inject.Singleton
 
 @Module
 @InstallIn(SingletonComponent::class)
-class DatabaseModule {
+object DatabaseModule {
+
     @Provides
+    @Singleton
     fun provideArticleDao(readerDatabase: ReaderDatabase): ArticleDao =
         readerDatabase.articleDao()
 
     @Provides
+    @Singleton
     fun provideFeedDao(readerDatabase: ReaderDatabase): FeedDao =
         readerDatabase.feedDao()
 
     @Provides
+    @Singleton
     fun provideGroupDao(readerDatabase: ReaderDatabase): GroupDao =
         readerDatabase.groupDao()
 
     @Provides
+    @Singleton
     fun provideAccountDao(readerDatabase: ReaderDatabase): AccountDao =
         readerDatabase.accountDao()
 
diff --git a/app/src/main/java/me/ash/reader/data/module/RetrofitModule.kt b/app/src/main/java/me/ash/reader/data/module/RetrofitModule.kt
index 5a3f7ac..b9b97d6 100644
--- a/app/src/main/java/me/ash/reader/data/module/RetrofitModule.kt
+++ b/app/src/main/java/me/ash/reader/data/module/RetrofitModule.kt
@@ -11,19 +11,20 @@ import javax.inject.Singleton
 
 @Module
 @InstallIn(SingletonComponent::class)
-class RetrofitModule {
-    @Singleton
+object RetrofitModule {
+
     @Provides
+    @Singleton
     fun provideRssNetworkDataSource(): RssNetworkDataSource =
         RssNetworkDataSource.getInstance()
 
-    @Singleton
     @Provides
+    @Singleton
     fun provideFeverApiDataSource(): FeverApiDataSource =
         FeverApiDataSource.getInstance()
 
-    @Singleton
     @Provides
+    @Singleton
     fun provideGoogleReaderApiDataSource(): GoogleReaderApiDataSource =
         GoogleReaderApiDataSource.getInstance()
 }
\ No newline at end of file
diff --git a/app/src/main/java/me/ash/reader/data/module/WorkerModule.kt b/app/src/main/java/me/ash/reader/data/module/WorkerModule.kt
index 6177667..9fcc37c 100644
--- a/app/src/main/java/me/ash/reader/data/module/WorkerModule.kt
+++ b/app/src/main/java/me/ash/reader/data/module/WorkerModule.kt
@@ -11,9 +11,10 @@ import javax.inject.Singleton
 
 @Module
 @InstallIn(SingletonComponent::class)
-class WorkerModule {
-    @Singleton
+object WorkerModule {
+
     @Provides
+    @Singleton
     fun provideWorkManager(@ApplicationContext context: Context): WorkManager =
         WorkManager.getInstance(context)
 }
\ No newline at end of file