diff --git a/app/build.gradle b/app/build.gradle
index 3565626..f62f141 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -9,7 +9,7 @@
     defaultConfig {
         applicationId "org.ntlab.radishforandroidstudio"
         minSdkVersion 16
-        targetSdkVersion 22
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
@@ -20,6 +20,7 @@
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    buildToolsVersion '27.0.3'
 }
 
 dependencies {