diff --git a/google-cloud-jar-parent/pom.xml b/google-cloud-jar-parent/pom.xml
index e824958cf545..7ab2d6e857a0 100644
--- a/google-cloud-jar-parent/pom.xml
+++ b/google-cloud-jar-parent/pom.xml
@@ -86,7 +86,7 @@
       <dependency>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-core</artifactId>
-        <version>1.5.33</version>
+        <version>1.5.34</version>
         <scope>test</scope>
       </dependency>
       <dependency>
diff --git a/java-storage/pom.xml b/java-storage/pom.xml
index 28c08b83144d..e2cc43742064 100644
--- a/java-storage/pom.xml
+++ b/java-storage/pom.xml
@@ -213,7 +213,7 @@
           <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-core</artifactId>
-            <version>1.3.16</version>
+            <version>1.5.34</version>
             <scope>test</scope>
           </dependency>
         </dependencies>