diff --git a/examples/java/build.gradle b/examples/java/build.gradle
index 5b24c638..cdb1722c 100644
--- a/examples/java/build.gradle
+++ b/examples/java/build.gradle
@@ -53,7 +53,7 @@ dependencies {
 
     compile 'org.apache.commons:commons-math3:3.6.1'
 
-    compile 'com.google.protobuf:protobuf-java:3.8.0'
+    compile 'com.google.protobuf:protobuf-java:3.9.0'
 
     compile 'io.grpc:grpc-netty:1.15.1'
     compile 'io.grpc:grpc-protobuf:1.15.1'