diff --git a/samples/client/petstore/akka-scala/pom.xml b/samples/client/petstore/akka-scala/pom.xml
index fcd419565d5..939d4745999 100644
--- a/samples/client/petstore/akka-scala/pom.xml
+++ b/samples/client/petstore/akka-scala/pom.xml
@@ -16,7 +16,7 @@
 
     <java.version>1.8</java.version>
     <scala.version>2.11.12</scala.version>
-    <json4s.jackson.version>3.5.3</json4s.jackson.version>
+    <json4s.jackson.version>4.0.0</json4s.jackson.version>
     <json4s.ext.version>3.2.11</json4s.ext.version>
     <spray.version>1.3.1</spray.version>
     <akka.version>2.5.8</akka.version>