diff --git a/google-cloud-clients/google-cloud-contrib/google-cloud-nio/pom.xml b/google-cloud-clients/google-cloud-contrib/google-cloud-nio/pom.xml
index 91eaf65b003f..b56bb17c445a 100644
--- a/google-cloud-clients/google-cloud-contrib/google-cloud-nio/pom.xml
+++ b/google-cloud-clients/google-cloud-contrib/google-cloud-nio/pom.xml
@@ -65,7 +65,7 @@
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>1.9.5</version>
+      <version>2.28.2</version>
       <scope>test</scope>
     </dependency>
   </dependencies>