diff --git a/rolling-log/pom.xml b/rolling-log/pom.xml
index 32b5450..d5ea42d 100644
--- a/rolling-log/pom.xml
+++ b/rolling-log/pom.xml
@@ -34,12 +34,16 @@
             <artifactId>log4j-api</artifactId>
             <version>2.17.1</version>
         </dependency>
-
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>
             <version>2.17.1</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-slf4j-impl</artifactId>
+            <version>2.17.1</version>
+        </dependency>
     </dependencies>
 
     <build>
diff --git a/rolling-log/src/main/java/de/swingbe/rollinglog/Main.java b/rolling-log/src/main/java/de/swingbe/rollinglog/Main.java
index 4a751e1..90df61d 100644
--- a/rolling-log/src/main/java/de/swingbe/rollinglog/Main.java
+++ b/rolling-log/src/main/java/de/swingbe/rollinglog/Main.java
@@ -1,15 +1,20 @@
 package de.swingbe.rollinglog;
 
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class Main {
 
-    private static final Logger logger = Logger.getLogger(Main.class);
+    private static final Logger logger = LoggerFactory.getLogger(Main.class);
 
     public static void main(String[] args) throws InterruptedException {
         for (int i = 0; i < 2000; i++) {
-            logger.info("This is the " + i + ". time I say 'Hello World'.");
-            Thread.sleep(1);
+            logger.trace("TRACE: This is the " + i + ". time I say 'Hello World'.");
+            logger.info("INFO: This is the " + i + ". time I say 'Hello World'.");
+            logger.debug("DEBUG: This is the " + i + ". time I say 'Hello World'.");
+            logger.warn("WARN: This is the " + i + ". time I say 'Hello World'.");
+            logger.error("ERROR: This is the " + i + ". time I say 'Hello World'.");
+            Thread.sleep(5);
         }
     }
 }