diff --git a/src/main/java/com/vamk/tbg/ui/ButtonContainer.java b/src/main/java/com/vamk/tbg/ui/ButtonContainer.java
index 2a1483d..98e4ccc 100644
--- a/src/main/java/com/vamk/tbg/ui/ButtonContainer.java
+++ b/src/main/java/com/vamk/tbg/ui/ButtonContainer.java
@@ -16,12 +16,15 @@
 import java.awt.BorderLayout;
 import java.awt.Dimension;
 import java.awt.GridLayout;
+import java.io.Serial;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
 public class ButtonContainer extends JPanel implements Tickable {
+    @Serial
+    private static final long serialVersionUID = -1848838910296723317L;
     // TODO remove static instance
     private static ButtonContainer instance;
     private final Awaitable<Entity> entity;
diff --git a/src/main/java/com/vamk/tbg/ui/EntityDataContainer.java b/src/main/java/com/vamk/tbg/ui/EntityDataContainer.java
index 5c0ad26..75f3d2e 100644
--- a/src/main/java/com/vamk/tbg/ui/EntityDataContainer.java
+++ b/src/main/java/com/vamk/tbg/ui/EntityDataContainer.java
@@ -10,10 +10,13 @@
 
 import javax.swing.JPanel;
 import java.awt.GridLayout;
+import java.io.Serial;
 import java.util.HashMap;
 import java.util.Map;
 
 public class EntityDataContainer extends JPanel {
+    @Serial
+    private static final long serialVersionUID = -7455891810519039109L;
     private final Map<Integer, EntityData> entityData;
 
     public EntityDataContainer(SignalDispatcher dispatcher) {
diff --git a/src/main/java/com/vamk/tbg/ui/GameWindow.java b/src/main/java/com/vamk/tbg/ui/GameWindow.java
index d6cd521..460a234 100644
--- a/src/main/java/com/vamk/tbg/ui/GameWindow.java
+++ b/src/main/java/com/vamk/tbg/ui/GameWindow.java
@@ -9,8 +9,11 @@
 import java.awt.GridLayout;
 import java.awt.event.WindowEvent;
 import java.awt.event.WindowListener;
+import java.io.Serial;
 
 public class GameWindow extends JFrame implements WindowListener {
+    @Serial
+    private static final long serialVersionUID = 3210313597488494598L;
     private final JLabel entityLabel;
     private final Runnable shutdownHook;