diff --git a/app/build.gradle b/app/build.gradle
index e031e49..ab4048b 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 27
     defaultConfig {
         applicationId "com.lilystudio.wheretosleepinnju"
         minSdkVersion 21
-        targetSdkVersion 28
-        versionCode 4
-        versionName "0.2.1"
+        targetSdkVersion 27
+        versionCode 6
+        versionName "0.2.2"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -34,8 +34,8 @@ dependencies {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
     testImplementation 'junit:junit:4.12'
-    implementation 'com.android.support:appcompat-v7:28.0.0'
-    implementation 'com.android.support:design:28.0.0'
+    implementation 'com.android.support:appcompat-v7:27.1.1'
+    implementation 'com.android.support:design:27.1.1'
     implementation 'org.jsoup:jsoup:1.10.3'
     implementation 'io.reactivex:rxjava:1.1.3'
     implementation 'io.reactivex:rxandroid:1.0.1'
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 2294512..2ad37d5 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,7 +1,7 @@
 <resources>
     <string name="app_name">南哪课表</string>
-    <string name="app_version">0.2.1</string>
-    <string name="app_LTS">0.2.1 (LTS)</string>
+    <string name="app_version">0.2.2</string>
+    <string name="app_LTS">0.2.2 (LTS)</string>
 
     <string name="qq_number">1455169173</string>
     <string name="pay_code">FKX00710CQCHIHK4B9CA31</string>