diff --git a/app/build.gradle b/app/build.gradle
index 14b2299..b424cec 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -21,6 +21,10 @@
         }
     }
     buildToolsVersion '27.0.3'
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
 }
 
 dependencies {