diff --git a/app/build.gradle b/app/build.gradle
index 2f46e19..cd631c0 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -23,6 +23,10 @@
     sourceSets{
         main.java.srcDirs += 'src/main/kotlin'
     }
+    compileOptions {
+        targetCompatibility 1.8
+        sourceCompatibility 1.8
+    }
 }
 
 dependencies {