diff --git a/Ch9/bugFixing/before/courses/pom.xml b/Ch9/bugFixing/before/courses/pom.xml
index abbe067..b9869f8 100644
--- a/Ch9/bugFixing/before/courses/pom.xml
+++ b/Ch9/bugFixing/before/courses/pom.xml
@@ -37,7 +37,7 @@
         <liquibase.maven.plugin.version>3.5.5</liquibase.maven.plugin.version>
         <java.version>1.8</java.version>
         <maven.compiler.plugin.version>3.7.0</maven.compiler.plugin.version>
-        <log4j.core.version>2.11.0</log4j.core.version>
+        <log4j.core.version>2.17.1</log4j.core.version>
         <junit.version>4.12</junit.version>
         <jackson.core.version>2.9.2</jackson.core.version>
         <assertj.core.version>2.6.0</assertj.core.version>
diff --git a/Ch9/bugFixing/before/courses/rest-api/pom.xml b/Ch9/bugFixing/before/courses/rest-api/pom.xml
index f28c7a9..6069c4d 100644
--- a/Ch9/bugFixing/before/courses/rest-api/pom.xml
+++ b/Ch9/bugFixing/before/courses/rest-api/pom.xml
@@ -91,7 +91,7 @@
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>
-            <version>2.11.0</version>
+            <version>2.17.1</version>
         </dependency>
         <dependency>
             <groupId>io.swagger</groupId>