diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0312ddb..daca4f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v4.15.3 (Feb 02, 2024)
+
+- Improved unread message count logic
+
 ## v4.15.2 (Jan 31, 2024)
 
 - Improved stability
diff --git a/Package.swift b/Package.swift
index b60fe99..ed1545d 100644
--- a/Package.swift
+++ b/Package.swift
@@ -15,8 +15,8 @@ let package = Package(
     targets: [
         .binaryTarget(
             name: "SendbirdChatSDK",
-            url: "https://github.com/sendbird/sendbird-chat-sdk-ios/releases/download/v4.15.2/SendbirdChatSDK.xcframework.zip",
-            checksum: "1d14f52edc5f4ddebb53b8c76d5baa608d91657455d626ea78a4285aeca249e1"
+            url: "https://github.com/sendbird/sendbird-chat-sdk-ios/releases/download/v4.15.3/SendbirdChatSDK.xcframework.zip",
+            checksum: "562c1796772e30559b95a28af8dc7359fdb97e833b653c63720a3a4a84e22160"
         ),
     ]
 )
diff --git a/SendbirdChatSDK.podspec b/SendbirdChatSDK.podspec
index 47bf068..60c5f45 100644
--- a/SendbirdChatSDK.podspec
+++ b/SendbirdChatSDK.podspec
@@ -1,7 +1,7 @@
 
 Pod::Spec.new do |s|
   s.name         = 'SendbirdChatSDK'
-  s.version      = "4.15.2"
+  s.version      = "4.15.3"
   s.summary      = 'Sendbird Chat iOS Framework'
   s.description  = 'Messaging and Chat API for Mobile Apps and Websites'
   s.homepage     = 'https://sendbird.com'
@@ -13,7 +13,7 @@ Pod::Spec.new do |s|
     'Celine Moon' => 'celine.moon@sendbird.com',
     'Ernest Hong' => 'ernest.hong@sendbird.com'
   }
-  s.source       = { :http => "https://github.com/sendbird/sendbird-chat-sdk-ios/releases/download/v4.15.2/SendbirdChatSDK.zip", :sha1 => "8bffff7274b3c749bfa97367774dba2d7f234a87" }
+  s.source       = { :http => "https://github.com/sendbird/sendbird-chat-sdk-ios/releases/download/v4.15.3/SendbirdChatSDK.zip", :sha1 => "0ee0380a2e23b7be940eb542d65bccb8e16c353a" }
   s.requires_arc = true
   s.platform = :ios, '11.0'
   s.documentation_url = 'https://sendbird.com/docs/chat'