diff --git a/build.gradle b/build.gradle
index 821408a..e414fb2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -11,7 +11,7 @@ project.ext.junitVersion = '5.3.1'
 
 mainClassName = '_9._2.Lights'
 
-sourceCompatibility = 1.8
+sourceCompatibility = 12
 
 repositories {
     mavenCentral()