diff --git a/symphony-bdk-core/build.gradle b/symphony-bdk-core/build.gradle
index 9709a1507..e11156de7 100644
--- a/symphony-bdk-core/build.gradle
+++ b/symphony-bdk-core/build.gradle
@@ -72,7 +72,7 @@ dependencies {
 }
 
 // OpenAPI code generation
-def apiBaseUrl = "https://raw.githubusercontent.com/finos/symphony-api-spec/136b530512eea112de73591906051871d034750a"
+def apiBaseUrl = "https://raw.githubusercontent.com/finos/symphony-api-spec/46abc03ad7225ebc32439c06920019c9d0fb0814"
 def generatedFolder = "$buildDir/generated/openapi"
 def apisToGenerate = [
         Agent: 'agent/agent-api-public-deprecated.yaml',
diff --git a/symphony-bdk-core/src/main/java/com/symphony/bdk/core/service/message/MessageService.java b/symphony-bdk-core/src/main/java/com/symphony/bdk/core/service/message/MessageService.java
index ca08c6595..080b94329 100644
--- a/symphony-bdk-core/src/main/java/com/symphony/bdk/core/service/message/MessageService.java
+++ b/symphony-bdk-core/src/main/java/com/symphony/bdk/core/service/message/MessageService.java
@@ -364,6 +364,7 @@ private Map<String, Object> getForm(Message message) {
     form.put("message", message.getContent());
     form.put("data", message.getData());
     form.put("version", message.getVersion());
+    form.put("silent", message.getSilent());
     form.put("attachment", toApiClientBodyParts(message.getAttachments()));
     form.put("preview", toApiClientBodyParts(message.getPreviews()));
     return form;
diff --git a/symphony-bdk-core/src/main/java/com/symphony/bdk/core/service/message/model/Message.java b/symphony-bdk-core/src/main/java/com/symphony/bdk/core/service/message/model/Message.java
index 5003b0271..93b5c4fa9 100644
--- a/symphony-bdk-core/src/main/java/com/symphony/bdk/core/service/message/model/Message.java
+++ b/symphony-bdk-core/src/main/java/com/symphony/bdk/core/service/message/model/Message.java
@@ -52,6 +52,12 @@ public class Message {
    * Optional message version in the format "major.minor". If empty, defaults to the latest supported version.
    */
   private final String version;
+  /**
+   * Optional boolean flag. Used in message update api only.
+   * If true, the message is updated as read already, otherwise it is unread. The default value is true.
+   * @since Agent 20.14
+   */
+  private final Boolean silent;
 
   Message(final MessageBuilder builder) {
     this.content = builder.content();
@@ -59,6 +65,7 @@ public class Message {
     this.data = builder.data();
     this.attachments = builder.attachments();
     this.previews = builder.previews();
+    this.silent = builder.silent();
   }
 
   /**
@@ -86,6 +93,7 @@ public static class MessageBuilder {
     private String version = "2.0";
     private String content;
     private String data;
+    private Boolean silent = Boolean.TRUE;
     private List<Attachment> attachments = new ArrayList<>();
     @Setter(value = AccessLevel.PRIVATE) private List<Attachment> previews = new ArrayList<>();
 
@@ -136,6 +144,11 @@ public MessageBuilder data(@Nonnull Object data) {
       }
     }
 
+    public MessageBuilder silent(@Nonnull Boolean silent) {
+      this.silent = silent;
+      return this;
+    }
+
     /**
      * Add attachment to the message.
      * @param content Attachment content.
diff --git a/symphony-bdk-core/src/test/java/com/symphony/bdk/core/service/message/MessageServiceTest.java b/symphony-bdk-core/src/test/java/com/symphony/bdk/core/service/message/MessageServiceTest.java
index 0ef205631..ea81628a6 100644
--- a/symphony-bdk-core/src/test/java/com/symphony/bdk/core/service/message/MessageServiceTest.java
+++ b/symphony-bdk-core/src/test/java/com/symphony/bdk/core/service/message/MessageServiceTest.java
@@ -344,6 +344,19 @@ void testMessageUpdate() throws IOException {
     assertEquals(1599659432867L, updateMessage.getInitialTimestamp());
   }
 
+  @Test
+  void testMessageSilentUpdate() throws IOException {
+    mockApiClient.onPost(V4_STREAM_MESSAGE_UPDATE.replace("{sid}", STREAM_ID).replace("{mid}", MESSAGE_ID),
+        JsonHelper.readFromClasspath("/message/update_message.json"));
+
+    final V4Message messageToUpdate = new V4Message().stream(new V4Stream().streamId(STREAM_ID)).messageId(MESSAGE_ID);
+    final Message content = Message.builder().content("This is a message update with silent flag as false").silent(false).build();
+    final V4Message updateMessage = this.messageService.update(messageToUpdate, content);
+
+    assertEquals(MESSAGE_ID, updateMessage.getMessageId());
+    assertEquals(false, updateMessage.getSilent());
+  }
+
   @Test
   void testGetAttachment() throws ApiException {
     final String attachmentId = "attachmentId";
diff --git a/symphony-bdk-core/src/test/java/com/symphony/bdk/core/service/message/model/MessageTest.java b/symphony-bdk-core/src/test/java/com/symphony/bdk/core/service/message/model/MessageTest.java
index 84a8b6564..6db5f026c 100644
--- a/symphony-bdk-core/src/test/java/com/symphony/bdk/core/service/message/model/MessageTest.java
+++ b/symphony-bdk-core/src/test/java/com/symphony/bdk/core/service/message/model/MessageTest.java
@@ -28,4 +28,14 @@ void checkMessageMLAppendedToContentIfNotSet() {
   void checkMessageMLNotAppendedToContentIfSet() {
     assertEquals("<messageML>hello</messageML>", Message.builder().content("<messageML>hello</messageML>").build().getContent());
   }
+
+  @Test
+  void checkMessageSilentValueIfSet() {
+    assertEquals(Boolean.FALSE, Message.builder().content("<messageML>hello</messageML>").silent(Boolean.FALSE).build().getSilent());
+  }
+
+  @Test
+  void checkMessageSilentDefaultValue() {
+    assertEquals(Boolean.TRUE, Message.builder().content("<messageML>hello</messageML>").build().getSilent());
+  }
 }
diff --git a/symphony-bdk-core/src/test/resources/message/update_message.json b/symphony-bdk-core/src/test/resources/message/update_message.json
index 7d946c7b7..730222594 100644
--- a/symphony-bdk-core/src/test/resources/message/update_message.json
+++ b/symphony-bdk-core/src/test/resources/message/update_message.json
@@ -29,5 +29,6 @@
     "sid": "6ca2b92d-f198-4059-9073-9701c26ab5f3",
     "initialMessageId": "vanscOQk6IJXm-6XAN3B33___oiRvNNKdA",
     "initialTimestamp": 1599659432867,
+    "silent": false,
     "replacing": "j7-VAoCY_1pGAYSye_MtI3___oPXo8VHbQ"
 }
diff --git a/symphony-bdk-examples/bdk-core-examples/src/main/java/com/symphony/bdk/examples/MessageUpdateExampleMain.java b/symphony-bdk-examples/bdk-core-examples/src/main/java/com/symphony/bdk/examples/MessageUpdateExampleMain.java
index ea8ea08cd..c464ab5c4 100644
--- a/symphony-bdk-examples/bdk-core-examples/src/main/java/com/symphony/bdk/examples/MessageUpdateExampleMain.java
+++ b/symphony-bdk-examples/bdk-core-examples/src/main/java/com/symphony/bdk/examples/MessageUpdateExampleMain.java
@@ -43,7 +43,7 @@ private static void startTheShow(SymphonyBdk bdk, String streamId) {
     for (int i = 0; i < 10; i++) {
       Thread.sleep((long) (Math.random() * (5000L - 500L)));
       String mml = "<emoji shortcode=\"" + pickEmoji.apply(i) + "\" /><br/><br/>Update <b>#" + (i + 1) + "</b>";
-      previousMessage = bdk.messages().update(previousMessage, Message.builder().content(mml).build());
+      previousMessage = bdk.messages().update(previousMessage, Message.builder().content(mml).silent(false).build());
     }
   }