diff --git a/CHANGELOG.md b/CHANGELOG.md
index 74a5c7a..aeb2d20 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,11 @@
 
 All notable changes to ext-websocket are documented here.
 
-## Unreleased
+## 1.2.1 - 2026-05-23
+
+### Added
+
+- Added WebSocket subprotocol negotiation with `WebSocket\Server::subprotocols()` and `WebSocket\Connection::$subprotocol`.
 
 ### Changed
 
diff --git a/php_websocket.h b/php_websocket.h
index e5971cd..9e9e57b 100644
--- a/php_websocket.h
+++ b/php_websocket.h
@@ -20,7 +20,7 @@
 extern zend_module_entry websocket_module_entry;
 #define phpext_websocket_ptr &websocket_module_entry
 
-#define PHP_WEBSOCKET_VERSION "1.1.0"
+#define PHP_WEBSOCKET_VERSION "1.2.1"
 #define WEBSOCKET_HTTP_MAX_REQUEST_SIZE 8192
 #define WEBSOCKET_DEFAULT_MAX_MESSAGE_SIZE (16 * 1024 * 1024)
 #define WEBSOCKET_DEFAULT_MAX_QUEUED_BYTES (16 * 1024 * 1024)