diff --git a/app/src/main/assets/updateLog.md b/app/src/main/assets/updateLog.md
index 2686f539a..127a497a1 100644
--- a/app/src/main/assets/updateLog.md
+++ b/app/src/main/assets/updateLog.md
@@ -11,6 +11,10 @@
 * 正文出现缺字漏字、内容缺失、排版错乱等情况，有可能是净化规则或简繁转换出现问题。
 * 漫画源看书显示乱码，**阅读与其他软件的源并不通用**，请导入阅读的支持的漫画源！
 
+**2021/10/24**
+
+* 修复夜间模式不随系统变化的bug
+
 **2021/10/22**
 
 * 修复封面
diff --git a/app/src/main/java/io/legado/app/base/AppContextWrapper.kt b/app/src/main/java/io/legado/app/base/AppContextWrapper.kt
index 9f2f5f0c6..510c262d6 100644
--- a/app/src/main/java/io/legado/app/base/AppContextWrapper.kt
+++ b/app/src/main/java/io/legado/app/base/AppContextWrapper.kt
@@ -8,16 +8,15 @@ import android.os.LocaleList
 import io.legado.app.constant.PreferKey
 import io.legado.app.utils.getPrefInt
 import io.legado.app.utils.getPrefString
+import io.legado.app.utils.sysConfiguration
 import java.util.*
 
 
+@Suppress("unused")
 object AppContextWrapper {
 
     fun wrap(context: Context): Context {
-        var fontScale = context.getPrefInt(PreferKey.fontScale) / 10f
-        if (fontScale !in 0.8f..1.6f) {
-            fontScale = 0f
-        }
+
         val resources: Resources = context.resources
         val configuration: Configuration = resources.configuration
         val targetLocale = getSetLocale(context)
@@ -28,20 +27,28 @@ object AppContextWrapper {
             @Suppress("DEPRECATION")
             configuration.locale = targetLocale
         }
-        configuration.fontScale = fontScale
+        configuration.fontScale = getFontScale(context)
         return context.createConfigurationContext(configuration)
     }
 
+    fun getFontScale(context: Context): Float {
+        var fontScale = context.getPrefInt(PreferKey.fontScale) / 10f
+        if (fontScale !in 0.8f..1.6f) {
+            fontScale = sysConfiguration.fontScale
+        }
+        return fontScale
+    }
+
     /**
      * 当前系统语言
      */
     private fun getSystemLocale(): Locale {
         val locale: Locale
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { //7.0有多语言设置获取顶部的语言
-            locale = Resources.getSystem().configuration.locales.get(0)
+            locale = sysConfiguration.locales.get(0)
         } else {
             @Suppress("DEPRECATION")
-            locale = Resources.getSystem().configuration.locale
+            locale = sysConfiguration.locale
         }
         return locale
     }
diff --git a/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
index ee966b5ca..3d90863ad 100644
--- a/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
@@ -12,6 +12,7 @@ import android.view.View
 import android.widget.SeekBar
 import androidx.preference.Preference
 import io.legado.app.R
+import io.legado.app.base.AppContextWrapper
 import io.legado.app.base.BasePreferenceFragment
 import io.legado.app.constant.AppConst
 import io.legado.app.constant.EventBus
@@ -277,10 +278,7 @@ class ThemeConfigFragment : BasePreferenceFragment(),
             PreferKey.barElevation -> preference.summary =
                 getString(R.string.bar_elevation_s, value)
             PreferKey.fontScale -> {
-                var fontScale = getPrefInt(PreferKey.fontScale) / 10f
-                if (fontScale !in 0.8f..1.6f) {
-                    fontScale = resources.configuration.fontScale
-                }
+                val fontScale = AppContextWrapper.getFontScale(requireContext())
                 preference.summary = getString(R.string.font_scale_summary, fontScale)
             }
             PreferKey.bgImage,