diff --git a/build.gradle.kts b/build.gradle.kts
index 7ec04ba..a118f0f 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -42,6 +42,8 @@ dependencies {
 }
 
 java {
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
     withSourcesJar()
 }