diff --git a/build.gradle.kts b/build.gradle.kts
index 2fa1f31..396e181 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -40,4 +40,9 @@ publishing {
 
 tasks.withType<KotlinCompile> {
     kotlinOptions.jvmTarget = "1.8"
+}
+
+tasks.withType<JavaCompile> {
+    sourceCompatibility = "1.8"
+    targetCompatibility = "1.8"
 }
\ No newline at end of file