diff --git a/google-cloud-jar-parent/pom.xml b/google-cloud-jar-parent/pom.xml
index af2f13e79de8..69b2b831515e 100644
--- a/google-cloud-jar-parent/pom.xml
+++ b/google-cloud-jar-parent/pom.xml
@@ -93,13 +93,13 @@
       <dependency>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-classic</artifactId>
-        <version>1.5.33</version>
+        <version>1.6.6</version>
         <scope>test</scope>
       </dependency>
       <dependency>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-core</artifactId>
-        <version>1.5.34</version>
+        <version>1.6.6</version>
         <scope>test</scope>
       </dependency>
       <dependency>