diff --git a/CHANGELOG.md b/CHANGELOG.md
index 245db28..534e76b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,20 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.3.1] - 2025-12-31
+
+### Changed
+
+- Simplified configuration: all settings now read from environment variables/.env only
+- Removed Docker socket fallback for container operations (Portainer API is now required)
+- Updated default search provider to SearXNG
+
+### Removed
+
+- `src/credentials.py` - credentials now managed via environment variables
+- Docker socket fallback methods from Portainer client
+- Unused search API settings (Brave, Google)
+
 ## [1.3.0] - 2025-12-31
 
 ### Added
diff --git a/pyproject.toml b/pyproject.toml
index 9c177fb..426d530 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "core-api"
-version = "1.3.0"
+version = "1.3.1"
 description = "Core Code API - Infrastructure management and tools API"
 readme = "README.md"
 requires-python = ">=3.12"