diff --git a/ch04-dynamic/pom.xml b/ch04-dynamic/pom.xml
index d14196a..f4adc32 100644
--- a/ch04-dynamic/pom.xml
+++ b/ch04-dynamic/pom.xml
@@ -35,7 +35,7 @@
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>
-            <version>2.13.0</version>
+            <version>2.15.0</version>
         </dependency>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>