diff --git a/src/main/java/de/stklcode/pubtrans/ura/UraClient.java b/src/main/java/de/stklcode/pubtrans/ura/UraClient.java
index 5d3294b..8f5f6a0 100644
--- a/src/main/java/de/stklcode/pubtrans/ura/UraClient.java
+++ b/src/main/java/de/stklcode/pubtrans/ura/UraClient.java
@@ -40,6 +40,8 @@ import static java.nio.charset.StandardCharsets.UTF_8;
  * @author Stefan Kalscheuer
  */
 public class UraClient implements Serializable {
+    private static final long serialVersionUID = -1183740075816686611L;
+
     private static final String DEFAULT_INSTANT_URL = "/interfaces/ura/instant_V1";
     private static final String DEFAULT_STREAM_URL = "/interfaces/ura/stream_V1";
 
diff --git a/src/main/java/de/stklcode/pubtrans/ura/model/Message.java b/src/main/java/de/stklcode/pubtrans/ura/model/Message.java
index 24f3ad8..1e35068 100644
--- a/src/main/java/de/stklcode/pubtrans/ura/model/Message.java
+++ b/src/main/java/de/stklcode/pubtrans/ura/model/Message.java
@@ -10,6 +10,8 @@ import java.util.List;
  * @since 1.3
  */
 public class Message implements Model {
+    private static final long serialVersionUID = 5233610751062774273L;
+
     private static final int MSG_UUID = 7;
     private static final int MSG_TYPE = 8;
     private static final int MSG_PRIORITY = 9;
diff --git a/src/main/java/de/stklcode/pubtrans/ura/model/Stop.java b/src/main/java/de/stklcode/pubtrans/ura/model/Stop.java
index 60bd591..1ff9618 100644
--- a/src/main/java/de/stklcode/pubtrans/ura/model/Stop.java
+++ b/src/main/java/de/stklcode/pubtrans/ura/model/Stop.java
@@ -25,6 +25,8 @@ import java.util.List;
  * @author Stefan Kalscheuer
  */
 public final class Stop implements Model {
+    private static final long serialVersionUID = 202040044477267787L;
+
     private static final int F_STOP_NAME = 1;
     private static final int F_STOP_ID = 2;
     private static final int F_INDICATOR = 3;
diff --git a/src/main/java/de/stklcode/pubtrans/ura/model/Trip.java b/src/main/java/de/stklcode/pubtrans/ura/model/Trip.java
index 349da29..7bc174e 100644
--- a/src/main/java/de/stklcode/pubtrans/ura/model/Trip.java
+++ b/src/main/java/de/stklcode/pubtrans/ura/model/Trip.java
@@ -25,6 +25,8 @@ import java.util.List;
  * @author Stefan Kalscheuer
  */
 public final class Trip implements Model {
+    private static final long serialVersionUID = 7477381188869237381L;
+
     private static final int VISIT_ID = 7;
     private static final int LINE_ID = 8;
     private static final int LINE_NAME = 9;