diff --git a/build.gradle.kts b/build.gradle.kts
index 94acc75..a26bb6d 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -71,6 +71,7 @@ tasks {
 
     withType<JavaCompile> {
         options.encoding = "UTF-8"
+        options.release = 8
     }
 
     withType<Javadoc> {