bump version to 5.3.0

Author: clemiller

CHANGELOG.md

@@ -9,11 +9,15 @@
     The creation of the tag can be disabled with the --no-git-tag-version if desired.
 -->
 
-# Staged on Develop
+# 5.3.0 - 15 January 2026
 
 ## Improvements
+- Updated Docker setup to use `Dockerfile` for production and `Dockerfile.dev` for development. See pull request [#722](https://github.com/mitre-attack/attack-navigator/pull/722).
 - Updated Angular from v17 to v19.
 
+## Fixes
+- Fixed `gradientRGB` out-of-bounds exception. See pull request [#687](https://github.com/mitre-attack/attack-navigator/pull/687).
+
 # 5.2.0 - 28 October 2025
 
 ## Improvements

nav-app/package-lock.json

@@ -5,7 +5,7 @@
     "type": "git",
     "url": "https://github.com/mitre-attack/attack-navigator.git"
   },
-  "version": "5.2.0",
+  "version": "5.3.0",
   "license": "Apache-2.0",
   "scripts": {
     "ng": "ng",