diff --git a/step-4/pom.xml b/step-4/pom.xml
index 1bc1d08..e93722f 100644
--- a/step-4/pom.xml
+++ b/step-4/pom.xml
@@ -79,7 +79,7 @@
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.2.3</version>
+      <version>1.2.13</version>
     </dependency>
     <dependency>
       <groupId>org.hsqldb</groupId>