diff --git a/build.gradle b/build.gradle
index 4b8f7dd..998a467 100644
--- a/build.gradle
+++ b/build.gradle
@@ -21,6 +21,7 @@ allprojects {
 subprojects {
 
     apply plugin: "java"
+    apply plugin: "java-library"
     apply plugin: boot
     apply plugin: "io.spring.dependency-management"
     apply plugin: "idea"