diff --git a/build.gradle b/build.gradle
index ab60373c21878a3c6c3d1efc2134dbe7308f4735..eba6774c01f4b2c16ccdb447ef9c73ecde925bcb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -54,7 +54,7 @@ subprojects {
 dependencies{
 
     // https://mvnrepository.com/artifact/com.google.guava/guava
-    api group: 'com.google.guava', name: 'guava', version: '31.0.1-jre'
+    implementation group: 'com.google.guava', name: 'guava', version: '31.0.1-jre'
 
     // https://mvnrepository.com/artifact/org.jboss.netty/netty
     api group: 'org.jboss.netty', name: 'netty', version: '3.2.10.Final'