diff --git a/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/Broadcaster.java b/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/Broadcaster.java
index 2cb6f77a..967c58b4 100644
--- a/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/Broadcaster.java
+++ b/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/Broadcaster.java
@@ -10,7 +10,7 @@
 
 import java.util.*;
 
-public class Broadcaster extends AbstractVerticle {
+public final class Broadcaster extends AbstractVerticle {
 
 	public final static int NO_BROADCASTING = -1;
 	public final static int DEFAULT_ID = 0;
diff --git a/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/StaticSender.java b/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/StaticSender.java
index a1fa268c..76ff4436 100644
--- a/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/StaticSender.java
+++ b/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/StaticSender.java
@@ -8,7 +8,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-public class StaticSender extends AbstractVerticle {
+public final class StaticSender extends AbstractVerticle {
 
 	public record Configuration(@JsonProperty String inAddress,
 								@JsonProperty String outAddress,
diff --git a/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/tcp/TcpDispatcher.java b/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/tcp/TcpDispatcher.java
index 156706b0..499a45af 100644
--- a/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/tcp/TcpDispatcher.java
+++ b/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/tcp/TcpDispatcher.java
@@ -10,7 +10,7 @@
 import java.text.BreakIterator;
 import java.util.Arrays;
 
-public class TcpDispatcher extends AbstractVerticle {
+public final class TcpDispatcher extends AbstractVerticle {
 
 	@Override
 	public void start(Promise<Void> startPromise) {
diff --git a/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/tcp/TcpTimeouts.java b/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/tcp/TcpTimeouts.java
index c28bb27d..7f01e37c 100644
--- a/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/tcp/TcpTimeouts.java
+++ b/modules/telestion-services/src/main/java/de/wuespace/telestion/services/connection/tcp/TcpTimeouts.java
@@ -2,7 +2,7 @@
 
 import java.time.Duration;
 
-public class TcpTimeouts {
+public final class TcpTimeouts {
 	/**
 	 * Close tcp connection after first received packet.
 	 */