diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
index e1622dd..d4e0061 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -32,7 +32,7 @@ phpqa/
 ### 1. Image Docker (`Dockerfile`)
 
 Image Docker construite en deux étapes (`php:X.Y-cli` pour compiler, `debian:slim` à l'exécution) avec :
-- Uniquement les outils QA appelés par les tâches Castor (PHPStan, ECS, Rector, Deptrac, PHPUnit, Infection, parallel-lint)
+- Uniquement les outils QA appelés par les tâches Castor (PHPStan, ECS, Rector, Deptrac, PHPUnit, Infection, parallel-lint, Mago)
 - Castor pré-installé (binaire statique)
 - Les extensions PHP nécessaires aux projets Symfony/Doctrine
 - Le layout `/tools/.composer/vendor-bin/...` hérité de `jakzal/phpqa`, référencé par les projets
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3357467..5537a74 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+### Added
+
+- Mago 1.50.0 (`/tools/mago`), the formatter, linter and analyzer of Carthage Software.
+  Static musl binary, amd64 and arm64, pinned by the `MAGO_VERSION` build argument.
+  The image carried Mago 1.46.0 through `jakzal/phpqa`; the lean rewrite dropped it.
+
 ### Changed - Lean Docker image (3.2 GB → ~0.8 GB, 689 MB → ~150 MB compressed)
 
 - The image is no longer based on `jakzal/phpqa`. It is a two-stage build on the official
diff --git a/Dockerfile b/Dockerfile
index 070e337..92f7831 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,6 @@
 ARG PHP_VERSION=8.4
 ARG DEBIAN_RELEASE=trixie
+ARG MAGO_VERSION=1.50.0
 
 # ============================================================
 # Stage 1: build PHP extensions and install QA tools
@@ -163,6 +164,24 @@ RUN set -eux; \
 	mv ~/.local/bin/castor /usr/local/bin/castor; \
 	chmod 755 /usr/local/bin/castor
 
+# ------------------------------------------------------------
+# Mago (https://mago.carthage.software/): formatter, linter and analyzer
+# in a single Rust binary. The musl build is statically linked, so it adds
+# nothing to the runtime libraries computed below.
+# ------------------------------------------------------------
+ARG MAGO_VERSION
+ARG TARGETARCH
+RUN set -eux; \
+	case "$TARGETARCH" in \
+		amd64) mago_arch=x86_64 ;; \
+		arm64) mago_arch=aarch64 ;; \
+		*) echo "unsupported architecture: $TARGETARCH" >&2; exit 1 ;; \
+	esac; \
+	target="mago-${MAGO_VERSION}-${mago_arch}-unknown-linux-musl"; \
+	curl -sSL "https://github.com/carthage-software/mago/releases/download/${MAGO_VERSION}/${target}.tar.gz" \
+		| tar -xz -C /tools --strip-components=1 "${target}/mago"; \
+	chmod 755 /tools/mago
+
 # ------------------------------------------------------------
 # Compute the Debian packages providing the shared libraries needed
 # at runtime by PHP, its extensions and Castor. The list is consumed
@@ -232,6 +251,7 @@ RUN set -eux; \
 	infection --version; \
 	phpunit --version; \
 	parallel-lint --version; \
+	mago --version; \
 	find /tmp /var/tmp -mindepth 1 -delete; \
 	chown -R 1001:1001 /tools/.composer/cache
 
diff --git a/README.md b/README.md
index 6c2662a..28a6983 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 This repository provides:
 
 1. **🐳 Lean Docker Image** (~800 MB, ~150 MB compressed) built on the official `php:X.Y-cli` images with:
-   - ✅ Only the QA tools used by the Castor tasks (PHPStan, ECS, Rector, Deptrac, PHPUnit, Infection, parallel-lint)
+   - ✅ Only the QA tools used by the Castor tasks (PHPStan, ECS, Rector, Deptrac, PHPUnit, Infection, parallel-lint, Mago)
    - 🛠️ [Castor](https://github.com/jolicode/castor) pre-installed as a task runner (static build, works on every PHP version)
    - 🧩 The PHP extensions needed by Symfony/Doctrine projects (intl, pdo_pgsql, redis, amqp, imagick, xdebug, ...)
    - 🧪 Enhanced PHPUnit, PHPStan, and Infection tooling
@@ -126,6 +126,7 @@ ship its own copy in `vendor/bin`:
 | PHPUnit helpers (slow test detector, foundry, browser-kit, ...) | `/tools/.composer/vendor-bin/phpunit` |
 | `phpunit-10` … `phpunit-13` (PHAR), `phpunit` → newest one supported by the PHP version | `/tools` |
 | `parallel-lint` (PHAR) | `/tools` |
+| `mago` (static binary) | `/tools` |
 | `composer`, `castor` | `/usr/local/bin` |
 
 Other tools: `git`, `curl`, `wget`, `jq`, `unzip`, `openssh-client`.