diff --git a/build.gradle b/build.gradle
index 3145cd7..c7f4af3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,6 +8,11 @@ version '1.0-SNAPSHOT'
 
 mainClassName = 'fr.packageviewer.Main'
 
+java {
+    sourceCompatibility = JavaVersion.VERSION_13
+    targetCompatibility = JavaVersion.VERSION_13
+}
+
 jar{
     manifest {
         attributes(