diff --git a/app/build.gradle b/app/build.gradle
index b4ae7ca..0831eb3 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -30,6 +30,7 @@
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
     implementation 'com.android.support:appcompat-v7:27.1.1'
     implementation 'com.android.support.constraint:constraint-layout:1.1.0'
+    implementation 'com.android.support:support-v4:27.1.1'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'