diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
index b1d0fa6..fa727f7 100644
--- a/.claude-plugin/marketplace.json
+++ b/.claude-plugin/marketplace.json
@@ -6,7 +6,7 @@
   },
   "metadata": {
     "description": "Project management plugins with Gitea and NetBox integrations",
-    "version": "4.1.0"
+    "version": "5.0.0"
   },
   "plugins": [
     {
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d74c28d..3b7a3b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ All notable changes to the Leo Claude Marketplace will be documented in this fil
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## [Unreleased]
+## [5.0.0] - 2026-01-26
 
 ### Added
 
diff --git a/CLAUDE.md b/CLAUDE.md
index 7d9259a..a73688d 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -50,7 +50,7 @@ See `docs/DEBUGGING-CHECKLIST.md` for details on cache timing.
 ## Project Overview
 
 **Repository:** leo-claude-mktplace
-**Version:** 4.1.0
+**Version:** 5.0.0
 **Status:** Production Ready
 
 A plugin marketplace for Claude Code containing:
diff --git a/README.md b/README.md
index 75c4a6a..7c7fc29 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Leo Claude Marketplace - v4.1.0
+# Leo Claude Marketplace - v5.0.0
 
 A collection of Claude Code plugins for project management, infrastructure automation, and development workflows.
 
diff --git a/docs/CANONICAL-PATHS.md b/docs/CANONICAL-PATHS.md
index ef19a09..000c88d 100644
--- a/docs/CANONICAL-PATHS.md
+++ b/docs/CANONICAL-PATHS.md
@@ -2,7 +2,7 @@
 
 **This file defines ALL valid paths in this repository. No exceptions. No inference. No assumptions.**
 
-Last Updated: 2026-01-26 (v4.1.0)
+Last Updated: 2026-01-26 (v5.0.0)
 
 ---
 
@@ -49,6 +49,15 @@ leo-claude-mktplace/
 │   │   │   └── dbt_tools.py
 │   │   ├── requirements.txt
 │   │   └── .venv/
+│   ├── contract-validator/     # Contract validation MCP (NEW v5.0.0)
+│   │   ├── mcp_server/
+│   │   │   ├── server.py
+│   │   │   ├── parse_tools.py
+│   │   │   ├── validation_tools.py
+│   │   │   └── report_tools.py
+│   │   ├── tests/
+│   │   ├── requirements.txt
+│   │   └── .venv/
 │   └── viz-platform/           # Visualization MCP (NEW v4.1.0)
 │       ├── mcp_server/
 │       │   ├── server.py
@@ -135,6 +144,14 @@ leo-claude-mktplace/
 │   │   ├── agents/
 │   │   ├── hooks/
 │   │   └── claude-md-integration.md
+│   ├── contract-validator/     # NEW in v5.0.0
+│   │   ├── .claude-plugin/
+│   │   ├── .mcp.json
+│   │   ├── mcp-servers/
+│   │   │   └── contract-validator -> ../../../mcp-servers/contract-validator  # SYMLINK
+│   │   ├── commands/
+│   │   ├── agents/
+│   │   └── claude-md-integration.md
 │   └── viz-platform/           # NEW in v4.1.0
 │       ├── .claude-plugin/
 │       ├── .mcp.json
@@ -269,6 +286,7 @@ plugins/cmdb-assistant/mcp-servers/netbox -> ../../../mcp-servers/netbox
 plugins/pr-review/mcp-servers/gitea -> ../../../mcp-servers/gitea
 plugins/data-platform/mcp-servers/data-platform -> ../../../mcp-servers/data-platform
 plugins/viz-platform/mcp-servers/viz-platform -> ../../../mcp-servers/viz-platform
+plugins/contract-validator/mcp-servers/contract-validator -> ../../../mcp-servers/contract-validator
 ```
 
 ---
@@ -277,6 +295,7 @@ plugins/viz-platform/mcp-servers/viz-platform -> ../../../mcp-servers/viz-platfo
 
 | Date | Change | By |
 |------|--------|-----|
+| 2026-01-26 | v5.0.0: Added contract-validator plugin and MCP server | Claude Code |
 | 2026-01-26 | v4.1.0: Added viz-platform plugin and MCP server | Claude Code |
 | 2026-01-25 | v4.0.0: Added data-platform plugin and MCP server | Claude Code |
 | 2026-01-20 | v3.0.0: MCP servers moved to root with symlinks | Claude Code |