diff --git a/hello_ar/app/build.gradle b/hello_ar/app/build.gradle
index 5ba7063..d68ba70 100644
--- a/hello_ar/app/build.gradle
+++ b/hello_ar/app/build.gradle
@@ -33,7 +33,7 @@ dependencies {
     // https://github.com/javagl/Obj
     implementation 'de.javagl:obj:0.2.1'
 
-    implementation 'com.android.support:appcompat-v7:27.0.2'
+    implementation 'com.android.support:appcompat-v7:28.0.0'
     implementation 'com.android.support:design:27.0.2'
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 }