diff --git a/build.gradle b/build.gradle
index 288d24c..6477637 100644
--- a/build.gradle
+++ b/build.gradle
@@ -29,8 +29,8 @@ dependencies {
     implementation 'com.google.guava:guava:33.4.0-jre'
     implementation 'commons-cli:commons-cli:1.9.0'
     implementation 'net.sourceforge.argparse4j:argparse4j:0.9.0'
-    implementation 'org.apache.logging.log4j:log4j-api:2.12.3'
-    implementation 'org.apache.logging.log4j:log4j-core:2.12.3'
+    implementation 'org.slf4j:slf4j-api:1.6.1'
+    implementation 'org.slf4j:slf4j-simple:1.6.1'
     implementation 'javax.xml.bind:jaxb-api:2.4.0-b180830.0359'
     implementation 'software.amazon.awssdk:s3:2.30.6'
     testImplementation 'junit:junit:4.13.2'
diff --git a/src/main/java/de/jeyp91/App.java b/src/main/java/de/jeyp91/App.java
index 31bc3be..38f9645 100644
--- a/src/main/java/de/jeyp91/App.java
+++ b/src/main/java/de/jeyp91/App.java
@@ -1,12 +1,7 @@
 package de.jeyp91;
-import org.apache.logging.log4j.Level;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-import org.apache.logging.log4j.core.config.Configurator;
-import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder;
-import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory;
-import org.apache.logging.log4j.core.config.builder.api.RootLoggerComponentBuilder;
-import org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import de.jeyp91.apifootball.APIFootballUpdater;
 import de.jeyp91.tippliga.TLWMatchdaysUpdater;
@@ -33,18 +28,11 @@ public class App {
     private static int season;
     private static int league;
     private static String configFile;
-    private static final Logger logger = LogManager.getLogger(App.class);
+    private static final Logger logger = LoggerFactory.getLogger(App.class);
 
     public static void main(String[] args) {
-        ConfigurationBuilder<BuiltConfiguration> builder
-                = ConfigurationBuilderFactory.newConfigurationBuilder();
-
-        RootLoggerComponentBuilder rootLogger
-                = builder.newRootLogger(Level.ERROR);
-
-        builder.add(rootLogger);
-        Configurator.initialize(builder.build());
-        Configurator.setRootLevel(Level.INFO);
+        // SLF4J does not require explicit configuration here
+        // Configuration can be done via an external configuration file (e.g., logback.xml)
         initOptions(args);
         String sql = "";
         String beautifulInfo = "";
diff --git a/src/main/java/de/jeyp91/apifootball/APIFootballConnector.java b/src/main/java/de/jeyp91/apifootball/APIFootballConnector.java
index 6355ea3..bdcdcaa 100644
--- a/src/main/java/de/jeyp91/apifootball/APIFootballConnector.java
+++ b/src/main/java/de/jeyp91/apifootball/APIFootballConnector.java
@@ -3,8 +3,8 @@ package de.jeyp91.apifootball;
 import java.util.ArrayList;
 import java.util.HashMap;
 
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.json.simple.JSONArray;
 import org.json.simple.JSONObject;
 import org.json.simple.parser.JSONParser;
@@ -17,7 +17,7 @@ public class APIFootballConnector {
     private final int season;
     private final HashMap<Integer, JSONObject> rounds = new HashMap<>();
     private final HashMap<Integer, JSONObject> matches = new HashMap<>();
-    private static final Logger logger = LogManager.getLogger(APIFootballConnector.class);
+    private static final Logger logger = LoggerFactory.getLogger(APIFootballConnector.class);
 
     private APIFootballConnector(int season) {
         this.season = season;
diff --git a/src/main/java/de/jeyp91/apifootball/APIFootballUpdater.java b/src/main/java/de/jeyp91/apifootball/APIFootballUpdater.java
index 636d8fa..98f883b 100644
--- a/src/main/java/de/jeyp91/apifootball/APIFootballUpdater.java
+++ b/src/main/java/de/jeyp91/apifootball/APIFootballUpdater.java
@@ -8,8 +8,8 @@ import org.apache.http.HttpResponse;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.impl.client.HttpClientBuilder;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.json.simple.JSONArray;
 import org.json.simple.JSONObject;
 import org.json.simple.parser.JSONParser;
@@ -19,7 +19,7 @@ import de.jeyp91.S3Provider;
 
 public class APIFootballUpdater {
 
-    private static final Logger logger = LogManager.getLogger(APIFootballUpdater.class);
+    private static final Logger logger = LoggerFactory.getLogger(APIFootballUpdater.class);
     private static final String baseurl = "https://v3.football.api-sports.io/";
 
     public APIFootballUpdater() {
diff --git a/src/main/java/de/jeyp91/googlecalendar/GoogleCalendarConnector.java b/src/main/java/de/jeyp91/googlecalendar/GoogleCalendarConnector.java
index 47852fa..c32fd4a 100644
--- a/src/main/java/de/jeyp91/googlecalendar/GoogleCalendarConnector.java
+++ b/src/main/java/de/jeyp91/googlecalendar/GoogleCalendarConnector.java
@@ -11,7 +11,6 @@ import com.google.auth.oauth2.GoogleCredentials;
 
 import java.io.*;
 import java.util.Collections;
-import java.util.List;
 
 public class GoogleCalendarConnector {
     private static final String APPLICATION_NAME = "Google Calendar API Java Quickstart";
diff --git a/src/main/java/de/jeyp91/googlecalendar/TippligaGoogleEventManager.java b/src/main/java/de/jeyp91/googlecalendar/TippligaGoogleEventManager.java
index 4ee3da5..30f35e6 100644
--- a/src/main/java/de/jeyp91/googlecalendar/TippligaGoogleEventManager.java
+++ b/src/main/java/de/jeyp91/googlecalendar/TippligaGoogleEventManager.java
@@ -7,8 +7,8 @@ import com.google.api.services.calendar.model.EventDateTime;
 import com.google.api.services.calendar.model.Events;
 import de.jeyp91.tippliga.TLWMatchday;
 import de.jeyp91.tippligaforum.TippligaSQLConnector;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.time.LocalDateTime;
@@ -23,7 +23,7 @@ import static de.jeyp91.googlecalendar.GoogleCalendarConnector.getSerivce;
 public class TippligaGoogleEventManager {
 
     private static List<Event> allEvents = null;
-    private static final Logger logger = LogManager.getLogger(TippligaGoogleEventManager.class);
+    private static final Logger logger = LoggerFactory.getLogger(TippligaGoogleEventManager.class);
 
     private static final HashMap<String, String> allLeagueNames = new HashMap<>();
 
diff --git a/src/main/java/de/jeyp91/teamidmatcher/TeamIDMatcher.java b/src/main/java/de/jeyp91/teamidmatcher/TeamIDMatcher.java
index fd0c47e..3d24922 100644
--- a/src/main/java/de/jeyp91/teamidmatcher/TeamIDMatcher.java
+++ b/src/main/java/de/jeyp91/teamidmatcher/TeamIDMatcher.java
@@ -4,14 +4,15 @@ import com.google.common.collect.HashBiMap;
 import de.jeyp91.ResourceProvider;
 import de.jeyp91.StatusHolder;
 import de.jeyp91.apifootball.APIFootballMatch;
-import org.apache.logging.log4j.*;
 import org.json.simple.JSONArray;
 import org.json.simple.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class TeamIDMatcher {
 
     private static HashBiMap<Integer, Integer> ids = null;
-    private static final Logger logger = LogManager.getLogger(TeamIDMatcher.class);
+    private static final Logger logger = LoggerFactory.getLogger(TeamIDMatcher.class);
     private static JSONArray teams;
     private static boolean init = false;
     public static final int HOME = 0;
diff --git a/src/main/java/de/jeyp91/tippliga/TLWMatch.java b/src/main/java/de/jeyp91/tippliga/TLWMatch.java
index f7add37..202d2c6 100644
--- a/src/main/java/de/jeyp91/tippliga/TLWMatch.java
+++ b/src/main/java/de/jeyp91/tippliga/TLWMatch.java
@@ -8,14 +8,14 @@ import de.jeyp91.App;
 import de.jeyp91.BaseMatch;
 import de.jeyp91.teamidmatcher.TeamIDMatcher;
 import de.jeyp91.apifootball.APIFootballMatch;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  *
  */
 public class TLWMatch extends BaseMatch{
-    private static final Logger logger = LogManager.getLogger(TLWMatch.class);
+    private static final Logger logger = LoggerFactory.getLogger(TLWMatch.class);
 
     private Integer season = null;
     private Integer league = null;
diff --git a/src/main/java/de/jeyp91/tippliga/TLWMatchdaysUpdater.java b/src/main/java/de/jeyp91/tippliga/TLWMatchdaysUpdater.java
index d6f3d1e..04173e7 100644
--- a/src/main/java/de/jeyp91/tippliga/TLWMatchdaysUpdater.java
+++ b/src/main/java/de/jeyp91/tippliga/TLWMatchdaysUpdater.java
@@ -1,8 +1,8 @@
 package de.jeyp91.tippliga;
 
 import de.jeyp91.tippligaforum.TippligaSQLConnector;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
@@ -13,7 +13,7 @@ import static de.jeyp91.googlecalendar.TippligaGoogleEventManager.*;
 
 public class TLWMatchdaysUpdater {
 
-    private final Logger logger = LogManager.getLogger(TLWMatch.class);
+    private final Logger logger = LoggerFactory.getLogger(TLWMatch.class);
 
     int season;
     int league;
diff --git a/src/main/java/de/jeyp91/tippliga/TLWMatchesCreatorTipperLeague.java b/src/main/java/de/jeyp91/tippliga/TLWMatchesCreatorTipperLeague.java
index bd0323f..a35aa5c 100644
--- a/src/main/java/de/jeyp91/tippliga/TLWMatchesCreatorTipperLeague.java
+++ b/src/main/java/de/jeyp91/tippliga/TLWMatchesCreatorTipperLeague.java
@@ -3,8 +3,8 @@ package de.jeyp91.tippliga;
 import de.jeyp91.ResourceProvider;
 import de.jeyp91.StatusHolder;
 import de.jeyp91.tippligaforum.TippligaConfigProvider;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.json.simple.JSONArray;
 import org.json.simple.JSONObject;
 
@@ -12,7 +12,7 @@ import java.util.ArrayList;
 
 public class TLWMatchesCreatorTipperLeague extends TLWMatchesCreatorBase {
 
-    private final Logger logger = LogManager.getLogger(TLWMatchesCreatorTipperLeague.class);
+    private final Logger logger = LoggerFactory.getLogger(TLWMatchesCreatorTipperLeague.class);
 
     int season;
     int league;
diff --git a/src/main/java/de/jeyp91/tippliga/TLWMatchesCreatorTipperPokal.java b/src/main/java/de/jeyp91/tippliga/TLWMatchesCreatorTipperPokal.java
index 05147ee..4d0b7ef 100644
--- a/src/main/java/de/jeyp91/tippliga/TLWMatchesCreatorTipperPokal.java
+++ b/src/main/java/de/jeyp91/tippliga/TLWMatchesCreatorTipperPokal.java
@@ -2,8 +2,8 @@ package de.jeyp91.tippliga;
 
 import de.jeyp91.ResourceProvider;
 import de.jeyp91.tippligaforum.TippligaConfigProvider;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.json.simple.JSONArray;
 import org.json.simple.JSONObject;
 
@@ -11,7 +11,7 @@ import java.util.ArrayList;
 
 public class TLWMatchesCreatorTipperPokal extends TLWMatchesCreatorBase{
 
-    Logger logger = LogManager.getLogger(TLWMatchesCreatorTipperPokal.class);
+    Logger logger = LoggerFactory.getLogger(TLWMatchesCreatorTipperPokal.class);
 
     int season;
     int league;
diff --git a/src/main/java/de/jeyp91/tippliga/TLWMatchesResultsUpdater.java b/src/main/java/de/jeyp91/tippliga/TLWMatchesResultsUpdater.java
index 8e3d530..9b38910 100644
--- a/src/main/java/de/jeyp91/tippliga/TLWMatchesResultsUpdater.java
+++ b/src/main/java/de/jeyp91/tippliga/TLWMatchesResultsUpdater.java
@@ -5,8 +5,8 @@ import de.jeyp91.apifootball.APIFootballMatchesProvider;
 import de.jeyp91.teamidmatcher.TeamIDMatcher;
 import de.jeyp91.tippligaforum.TippligaSQLConnector;
 import de.jeyp91.tippligaforum.TippligaWebsiteConnector;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.json.simple.JSONArray;
 import org.json.simple.JSONObject;
 
@@ -15,7 +15,7 @@ import java.util.ArrayList;
 import java.util.Objects;
 
 public class TLWMatchesResultsUpdater extends TLWMatchesManagerBase {
-    private static final Logger logger = LogManager.getLogger(TLWMatchesResultsUpdater.class);
+    private static final Logger logger = LoggerFactory.getLogger(TLWMatchesResultsUpdater.class);
 
 
     ArrayList<ArrayList<TLWMatch>> tlwMatchesUpdated = new ArrayList<>();
diff --git a/src/main/java/de/jeyp91/tippliga/TLWMatchesUpdaterFootball.java b/src/main/java/de/jeyp91/tippliga/TLWMatchesUpdaterFootball.java
index 6177e6a..02e7f43 100644
--- a/src/main/java/de/jeyp91/tippliga/TLWMatchesUpdaterFootball.java
+++ b/src/main/java/de/jeyp91/tippliga/TLWMatchesUpdaterFootball.java
@@ -5,8 +5,8 @@ import de.jeyp91.teamidmatcher.TeamIDMatcher;
 import de.jeyp91.apifootball.APIFootballMatch;
 import de.jeyp91.apifootball.APIFootballMatchesProvider;
 import de.jeyp91.tippligaforum.TippligaSQLConnector;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.json.simple.JSONArray;
 import org.json.simple.JSONObject;
 
@@ -16,7 +16,7 @@ import java.util.Iterator;
 import java.util.Objects;
 
 public class TLWMatchesUpdaterFootball extends TLWMatchesManagerBase {
-    private static final Logger logger = LogManager.getLogger(TLWMatchesUpdaterFootball.class);
+    private static final Logger logger = LoggerFactory.getLogger(TLWMatchesUpdaterFootball.class);
 
     ArrayList<TLWMatch> tlwMatchesOriginal;
     ArrayList<TLWMatch> tlwMatchesUpdated;
diff --git a/src/main/java/de/jeyp91/tippliga/TLWTeamsCreator.java b/src/main/java/de/jeyp91/tippliga/TLWTeamsCreator.java
index d7f7f66..342ab52 100644
--- a/src/main/java/de/jeyp91/tippliga/TLWTeamsCreator.java
+++ b/src/main/java/de/jeyp91/tippliga/TLWTeamsCreator.java
@@ -1,8 +1,8 @@
 package de.jeyp91.tippliga;
 
 import de.jeyp91.tippligaforum.TippligaSQLConnector;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
@@ -10,7 +10,7 @@ import java.util.Set;
 
 public class TLWTeamsCreator {
 
-    private static final Logger logger = LogManager.getLogger(TLWTeamsCreator.class);
+    private static final Logger logger = LoggerFactory.getLogger(TLWTeamsCreator.class);
     int season;
     int league;
     ArrayList<TLWMatch> matches;
diff --git a/src/main/java/de/jeyp91/tippligaforum/MatchesListForumUpdater.java b/src/main/java/de/jeyp91/tippligaforum/MatchesListForumUpdater.java
index 2e6ca84..b7c33e2 100644
--- a/src/main/java/de/jeyp91/tippligaforum/MatchesListForumUpdater.java
+++ b/src/main/java/de/jeyp91/tippligaforum/MatchesListForumUpdater.java
@@ -2,8 +2,8 @@ package de.jeyp91.tippligaforum;
 
 import de.jeyp91.App;
 import de.jeyp91.apifootball.APIFootballUpdater;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.sql.ResultSet;
 import java.sql.SQLException;
@@ -11,7 +11,7 @@ import java.util.HashSet;
 
 public class MatchesListForumUpdater {
     private HashSet<Integer> leagues;
-    private static final Logger logger = LogManager.getLogger(MatchesListForumUpdater.class);
+    private static final Logger logger = LoggerFactory.getLogger(MatchesListForumUpdater.class);
 
     public MatchesListForumUpdater(int season) {
         this.leagues = new APIFootballUpdater().getLeagues(season);
diff --git a/src/main/java/de/jeyp91/tippligaforum/TippligaSQLConnector.java b/src/main/java/de/jeyp91/tippligaforum/TippligaSQLConnector.java
index 3cb7426..91dfc33 100644
--- a/src/main/java/de/jeyp91/tippligaforum/TippligaSQLConnector.java
+++ b/src/main/java/de/jeyp91/tippligaforum/TippligaSQLConnector.java
@@ -6,8 +6,8 @@ import de.jeyp91.tippliga.TLWMatch;
 import de.jeyp91.tippliga.TLWMatchday;
 import de.jeyp91.tippliga.TLWTeam;
 import de.jeyp91.whatsapp.WhatsAppReminder;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import javax.xml.bind.DatatypeConverter;
 import java.security.MessageDigest;
@@ -24,7 +24,7 @@ public class TippligaSQLConnector {
 
     Connection con;
 
-    private static final Logger logger = LogManager.getLogger(TippligaSQLConnector.class);
+    private static final Logger logger = LoggerFactory.getLogger(TippligaSQLConnector.class);
     private static TippligaSQLConnector tlwSqlCon = null;
 
     static {
@@ -251,7 +251,7 @@ public class TippligaSQLConnector {
             stmt = con.createStatement();
             rset = stmt.executeQuery(queryString);
         } catch (SQLException e) {
-            logger.error(e.getStackTrace());
+            logger.error(e.getMessage());
         }
         return rset;
     }
diff --git a/src/main/java/de/jeyp91/tippligaforum/TippligaWebsiteConnector.java b/src/main/java/de/jeyp91/tippligaforum/TippligaWebsiteConnector.java
index 1fdf11f..3b6a3dd 100644
--- a/src/main/java/de/jeyp91/tippligaforum/TippligaWebsiteConnector.java
+++ b/src/main/java/de/jeyp91/tippligaforum/TippligaWebsiteConnector.java
@@ -1,8 +1,8 @@
 package de.jeyp91.tippligaforum;
 
 import de.jeyp91.tippliga.TLWMatch;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.net.*;
@@ -23,7 +23,7 @@ public class TippligaWebsiteConnector {
     CookieManager cm = new CookieManager(null, CookiePolicy.ACCEPT_ALL);
 
     CookieStore cookieStore = cm.getCookieStore();
-    private static final Logger logger = LogManager.getLogger(TippligaWebsiteConnector.class);
+    private static final Logger logger = LoggerFactory.getLogger(TippligaWebsiteConnector.class);
     private final HttpClient client;
     private final String username = System.getenv("FORUM_USERNAME");
     private final String password = System.getenv("FORUM_PASSWORD");
diff --git a/src/main/java/de/jeyp91/whatsapp/WhatsAppNotifier.java b/src/main/java/de/jeyp91/whatsapp/WhatsAppNotifier.java
index 9845faf..b457d2a 100644
--- a/src/main/java/de/jeyp91/whatsapp/WhatsAppNotifier.java
+++ b/src/main/java/de/jeyp91/whatsapp/WhatsAppNotifier.java
@@ -1,8 +1,8 @@
 package de.jeyp91.whatsapp;
 
 import de.jeyp91.tippligaforum.TippligaSQLConnector;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.json.simple.JSONObject;
 
 import java.net.URI;
@@ -16,7 +16,7 @@ public class WhatsAppNotifier {
     private final String host = System.getenv("TLW_WHATSAPP_HOST");
     private final String port = System.getenv("TLW_WHATSAPP_PORT");
     private final String apiKey = System.getenv("TLW_WHATSAPP_API_KEY");
-    private static final Logger logger = LogManager.getLogger(WhatsAppNotifier.class);
+    private static final Logger logger = LoggerFactory.getLogger(WhatsAppNotifier.class);
     private final HttpClient client;
     private final OpenAIConnector openAIConnector = new OpenAIConnector();