diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index a9d410dbf..9bdd368aa 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -1,4 +1,19 @@
 ARG PHP_VERSION
+
+FROM alpine:3.19.1 as php-cs-fixer
+
+RUN set -eux; \
+  version=3.52.1; \
+  \
+  apk add --no-cache curl; \
+  \
+  curl -sSLfo /usr/local/bin/php-cs-fixer \
+    https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/releases/download/v${version}/php-cs-fixer.phar; \
+  \
+  chmod +x /usr/local/bin/php-cs-fixer; \
+  :;
+
+
 FROM php:${PHP_VERSION}-cli
 
 RUN docker-php-ext-install pdo
@@ -66,3 +81,5 @@ RUN set -eux; \
   \
   file /bin/ls --mime | grep application/x-executable; \
   :;
+
+COPY --from=php-cs-fixer /usr/local/bin/php-cs-fixer /usr/local/bin/php-cs-fixer
diff --git a/README.md b/README.md
index 9cf3d95cc..c7624f552 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,12 @@ Tests
     docker-compose down
 
 
+Lint
+----
+
+    test/bin/lint
+
+
 Documentation
 -------------
 
diff --git a/test/bin/lint b/test/bin/lint
new file mode 100755
index 000000000..7ba3a8e05
--- /dev/null
+++ b/test/bin/lint
@@ -0,0 +1,4 @@
+#! /bin/sh -eu
+
+docker-compose up -d --build --remove-orphans php74 > /dev/null
+docker-compose exec php74 php-cs-fixer fix