diff --git a/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpMsg.java b/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpMsg.java
index 0deb41ed6f..d7de6b4df1 100644
--- a/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpMsg.java
+++ b/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpMsg.java
@@ -26,7 +26,7 @@
  *
  * @param <T> self
  */
-public abstract class HttpMsg<T extends HttpMsg<T>> extends AbstractMessage<T> {
+public abstract sealed class HttpMsg<T extends HttpMsg<T>> extends AbstractMessage<T> {
 
 	/**
 	 * Use this as the field path to set the HTTP request version
diff --git a/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpReq.java b/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpReq.java
index a84319d4b6..0513122a0a 100644
--- a/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpReq.java
+++ b/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpReq.java
@@ -22,7 +22,7 @@
  * An HTTP request message, which probably encapsulates another {@link Message}
  * as the request body
  */
-public class HttpReq extends HttpMsg<HttpReq> {
+public final class HttpReq extends HttpMsg<HttpReq> {
 
 	/**
 	 * Use this as the field path to set the HTTP request method
diff --git a/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpRes.java b/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpRes.java
index a115a70893..254454c09e 100644
--- a/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpRes.java
+++ b/message/message-http/src/main/java/com/mastercard/test/flow/msg/http/HttpRes.java
@@ -20,7 +20,7 @@
  * An HTTP response message, which probably encapsulates another {@link Message}
  * as the response body
  */
-public class HttpRes extends HttpMsg<HttpRes> {
+public final class HttpRes extends HttpMsg<HttpRes> {
 
 	/**
 	 * Use this as the field path to set the HTTP status code