diff --git a/app/build.gradle b/app/build.gradle
index 5b18c04..dbee4ca 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -11,8 +11,8 @@ android {
         applicationId "top.itning.yunshuclassschedule"
         minSdkVersion 21
         targetSdkVersion 28
-        versionCode 59
-        versionName "2.5.3"
+        versionCode 60
+        versionName "2.5.4"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         javaCompileOptions {
             annotationProcessorOptions {
diff --git a/app/src/main/java/top/itning/yunshuclassschedule/service/CommonService.kt b/app/src/main/java/top/itning/yunshuclassschedule/service/CommonService.kt
index 1251a0c..4583e57 100644
--- a/app/src/main/java/top/itning/yunshuclassschedule/service/CommonService.kt
+++ b/app/src/main/java/top/itning/yunshuclassschedule/service/CommonService.kt
@@ -110,6 +110,9 @@ class CommonService : Service(), SharedPreferences.OnSharedPreferenceChangeListe
                         }
                         break
                     }
+                    if (i > 50) {
+                        i = 1
+                    }
                     Log.d(TAG, "Set week num $i")
                     if (defaultSharedPreferences.edit().putString(NOW_WEEK_NUM, i.toString()).commit()) {
                         App.sharedPreferences.edit().putLong(ConstantPool.Str.NEXT_WEEK_OF_MONDAY.get(), lastTimeMillis).apply()