diff --git a/build.gradle b/build.gradle
index 9ab86781..2731dd95 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,6 +1,8 @@
 apply plugin: 'java'
 apply plugin: 'application'
 
+sourceCompatibility = "1.8";
+
 mainClassName = 'cli.Main'
 
 repositories {