diff --git a/google-cloud-nio/pom.xml b/google-cloud-nio/pom.xml
index 061e3d519..cc6c72747 100644
--- a/google-cloud-nio/pom.xml
+++ b/google-cloud-nio/pom.xml
@@ -86,7 +86,7 @@
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>3.4.4</version>
+      <version>3.5.6</version>
       <scope>test</scope>
     </dependency><dependency>
       <groupId>org.hamcrest</groupId>