diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5865ab9..58d23ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Deprecated
+
+- The project is deprecated and no longer maintained. No further releases are planned.
+
 ## [1.3.0] - 2026-09-10
 
 ### Fixed
diff --git a/README.md b/README.md
index 8a5cd0e..4226ce2 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 
-# 🛠️ Sonar OpenApi (plugin) ![Release](https://img.shields.io/badge/release-1.2.1-purple) ![Swagger](https://img.shields.io/badge/-openapi-%23Clojure?style=flat&logo=swagger&logoColor=white) ![Java](https://img.shields.io/badge/java-%23ED8B00.svg?style=flat&logo=openjdk&logoColor=white)  [![License: LGPL v3](https://img.shields.io/badge/license-LGPL_v3-blue.svg)](https://www.gnu.org/licenses/lgpl-3.0) 
+# 🛠️ Sonar OpenApi (plugin) ![Status](https://img.shields.io/badge/status-deprecated-red) ![Release](https://img.shields.io/badge/release-1.2.1-purple) ![Swagger](https://img.shields.io/badge/-openapi-%23Clojure?style=flat&logo=swagger&logoColor=white) ![Java](https://img.shields.io/badge/java-%23ED8B00.svg?style=flat&logo=openjdk&logoColor=white)  [![License: LGPL v3](https://img.shields.io/badge/license-LGPL_v3-blue.svg)](https://www.gnu.org/licenses/lgpl-3.0) 
+
+> [!WARNING]
+> **This project is deprecated and no longer maintained.** No new features, bug fixes or releases are planned. Issues and pull requests may not be reviewed. Existing releases remain available, but use them at your own risk.
 
 Sonar OpenApi (plugin) is a code analyzer for OpenAPI specifications,  is the spiritual successor of [SonarOpenApi](https://github.com/societe-generale/sonar-openapi), carrying on from the point where it left off with support of Apiaddicts community.