diff --git a/CHANGELOG.md b/CHANGELOG.md
index 22bc0e0..6bc4e21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -46,21 +46,42 @@ This project uses famous football stadiums (A-Z) that hosted FIFA World Cup matc
 
 ### Changed
 
-- Upgrade AutoMapper from 14.x to 16.1.1 to resolve high-severity security vulnerability GHSA-rvv3-g6hj-g44x (#414)
-- Rename test methods to follow Microsoft .NET naming standard (#396)
-
 ### Deprecated
 
 ### Removed
 
 ### Fixed
 
+### Security
+
+---
+
+## [2.0.0 - centenario] - 2026-03-18
+
+### Changed
+
+- Refactor error responses to use RFC 7807 Problem Details (#418)
+- Add `/squadNumber/` path segment to PUT and DELETE routes — **breaking change** (#418)
+- Extract `NotFoundTitle` constant and remove redundant null-conditional operator (#418)
+- Rename test methods to follow Microsoft .NET naming standard (#396)
+- Upgrade AutoMapper from 14.x to 16.1.1 (#414) — see Security section
+- Bump FluentAssertions from 8.8.0 to 8.9.0 (#417)
+- Bump coverlet.collector from 8.0.0 to 8.0.1 (#419)
+- Bump softprops/action-gh-release from 2.6.0 to 2.6.1 (#416)
+
+### Fixed
+
+- Add squad number mismatch guard in `PutAsync` and update README (#418)
+- Strengthen test assertions for Problem Details responses (#418)
 - Fix broken 201 assertion in controller test for `Post_Players_NonExisting` (#396)
 - Add missing edge case tests for `UpdateAsync`, `DeleteAsync`, and
   `DateOfBirth` boundary validation (#396)
 
 ### Security
 
+- Sanitize player data before logging to prevent log forging
+- Upgrade AutoMapper from 14.x to 16.1.1 to resolve high-severity security vulnerability GHSA-rvv3-g6hj-g44x (#414)
+
 ---
 
 ## [1.1.0 - bernabeu] - 2026-02-09
diff --git a/README.md b/README.md
index 3af7aa5..24ea47d 100644
--- a/README.md
+++ b/README.md
@@ -330,14 +330,16 @@ To create a new release, follow this workflow:
 
 #### 1. Update CHANGELOG.md
 
-First, document your changes in [CHANGELOG.md](CHANGELOG.md):
+First, create a `release/` branch and document your changes in [CHANGELOG.md](CHANGELOG.md):
 
 ```bash
+git checkout -b release/1.0.0-azteca
 # Move items from [Unreleased] to new release section
 # Example: [1.0.0 - azteca] - 2026-01-22
 git add CHANGELOG.md
 git commit -m "docs: prepare changelog for v1.0.0-azteca release"
-git push
+git push origin release/1.0.0-azteca
+# Open a PR, get it reviewed, and merge into master
 ```
 
 #### 2. Create and Push Tag