diff --git a/slf4j/pom.xml b/slf4j/pom.xml
index f901512..0fdda7c 100644
--- a/slf4j/pom.xml
+++ b/slf4j/pom.xml
@@ -85,10 +85,11 @@
     </build>
 
     <dependencies>
+        <!--required for Logger class-->
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-slf4j-impl</artifactId>
-            <version>2.9.0</version>
+            <version>2.17.1</version>
         </dependency>
     </dependencies>