diff --git a/.env.dist b/.env.dist
index a9afdb7b9..da04f713c 100644
--- a/.env.dist
+++ b/.env.dist
@@ -4,8 +4,8 @@ AZURITE_ACCOUNT_NAME=flowphpaccount01
 AZURITE_ACCOUNT_KEY=flowphpkey01
 S3_ENDPOINT=http://localhost:9000
 S3_REGION=us-east-1
-S3_ACCESS_KEY_ID=minioadmin
-S3_SECRET_ACCESS_KEY=minioadmin
+S3_ACCESS_KEY_ID=flowphpaccess01
+S3_SECRET_ACCESS_KEY=flowphpsecret01
 S3_BUCKET=flowphpbucket01
 SFTP_HOST=localhost
 SFTP_PORT=2222
diff --git a/.github/workflows/job-tests.yml b/.github/workflows/job-tests.yml
index 528c16134..02d2ee97b 100644
--- a/.github/workflows/job-tests.yml
+++ b/.github/workflows/job-tests.yml
@@ -83,17 +83,18 @@ jobs:
             sleep 2
           done
 
-      - name: "Start MinIO and create bucket"
+      - name: "Start RustFS"
         run: |
-          docker run -d --name minio -p 9000:9000 \
-            -e MINIO_ROOT_USER=minioadmin \
-            -e MINIO_ROOT_PASSWORD=minioadmin \
-            quay.io/minio/minio:latest server /data
-          timeout 30 sh -c 'until curl -fs http://localhost:9000/minio/health/live > /dev/null; do sleep 1; done'
-          docker run --rm --network=host --entrypoint sh quay.io/minio/mc:latest -c "
-            mc alias set local http://localhost:9000 minioadmin minioadmin &&
-            mc mb local/flowphpbucket01 --ignore-existing
-          "
+          docker run -d --name rustfs -p 9000:9000 \
+            -e RUSTFS_ACCESS_KEY=flowphpaccess01 \
+            -e RUSTFS_SECRET_KEY=flowphpsecret01 \
+            -e RUSTFS_ADDRESS=:9000 \
+            -e RUSTFS_CONSOLE_ENABLE=false \
+            -e RUSTFS_REGION=us-east-1 \
+            -e RUSTFS_VOLUMES=/data \
+            rustfs/rustfs:1.0.0
+          timeout 90 sh -c 'until curl -fs http://localhost:9000/health/ready > /dev/null; do sleep 1; done' \
+            || { echo "RustFS did not become ready"; docker logs rustfs; exit 1; }
 
       - name: "Start SFTP server"
         run: |
@@ -154,8 +155,8 @@ jobs:
           AZURITE_ACCOUNT_KEY: "flowphpkey01"
           S3_ENDPOINT: "http://localhost:9000"
           S3_REGION: "us-east-1"
-          S3_ACCESS_KEY_ID: "minioadmin"
-          S3_SECRET_ACCESS_KEY: "minioadmin"
+          S3_ACCESS_KEY_ID: "flowphpaccess01"
+          S3_SECRET_ACCESS_KEY: "flowphpsecret01"
           SFTP_HOST: "localhost"
           SFTP_PORT: "2222"
           SFTP_USER: "flow"
@@ -183,8 +184,8 @@ jobs:
           AZURITE_ACCOUNT_KEY: "flowphpkey01"
           S3_ENDPOINT: "http://localhost:9000"
           S3_REGION: "us-east-1"
-          S3_ACCESS_KEY_ID: "minioadmin"
-          S3_SECRET_ACCESS_KEY: "minioadmin"
+          S3_ACCESS_KEY_ID: "flowphpaccess01"
+          S3_SECRET_ACCESS_KEY: "flowphpsecret01"
           OTEL_RECEIVER_HTTP_ENDPOINT: "http://localhost:4318"
           OTEL_RECEIVER_GRPC_ENDPOINT: "localhost:4317"
           OTEL_COLLECTOR_METRICS_ENDPOINT: "http://localhost:8888/metrics"
diff --git a/compose.yml.dist b/compose.yml.dist
index b063fede2..6047b0609 100644
--- a/compose.yml.dist
+++ b/compose.yml.dist
@@ -60,31 +60,26 @@ services:
             - "6379:6379"
         networks:
             - flow-php
-    minio:
-        image: minio/minio:latest
-        container_name: flow-php-minio
-        command: server /data --console-address ":9001"
+    rustfs:
+        image: rustfs/rustfs:1.0.0
+        container_name: flow-php-rustfs
         ports:
             - "9000:9000"
             - "9001:9001"
         environment:
-            - MINIO_ROOT_USER=minioadmin
-            - MINIO_ROOT_PASSWORD=minioadmin
-        volumes:
-            - "./var/minio:/data"
-        networks:
-            - flow-php
-    minio-init:
-        image: minio/mc
-        container_name: flow-php-minio-init
-        depends_on:
-            - minio
-        entrypoint: >
-            /bin/sh -c "
-            until mc alias set flow http://minio:9000 minioadmin minioadmin; do sleep 1; done;
-            mc mb flow/flowphpbucket01 --ignore-existing;
-            exit 0;
-            "
+            - RUSTFS_ACCESS_KEY=flowphpaccess01
+            - RUSTFS_SECRET_KEY=flowphpsecret01
+            - RUSTFS_ADDRESS=:9000
+            - RUSTFS_CONSOLE_ENABLE=true
+            - RUSTFS_CONSOLE_ADDRESS=:9001
+            - RUSTFS_REGION=us-east-1
+            - RUSTFS_VOLUMES=/data
+        healthcheck:
+            test: ["CMD-SHELL", "curl -fs http://127.0.0.1:9000/health/ready || exit 1"]
+            interval: 5s
+            timeout: 3s
+            retries: 12
+            start_period: 20s
         networks:
             - flow-php
     sftp:
diff --git a/documentation/components/bridges/symfony-filesystem-bundle.md b/documentation/components/bridges/symfony-filesystem-bundle.md
index 348cf72b5..606dfd243 100644
--- a/documentation/components/bridges/symfony-filesystem-bundle.md
+++ b/documentation/components/bridges/symfony-filesystem-bundle.md
@@ -252,7 +252,7 @@ flow_filesystem:
             region: '%env(AWS_REGION)%'
             access_key_id: '%env(AWS_ACCESS_KEY_ID)%'
             access_key_secret: '%env(AWS_SECRET_ACCESS_KEY)%'
-            endpoint: ~                # optional, MinIO/R2/Scaleway/LocalStack
+            endpoint: ~                # optional, RustFS/R2/Scaleway/LocalStack
             path_style_endpoint: false
             profile: ~
             debug: false
diff --git a/documentation/contributing/environment.md b/documentation/contributing/environment.md
index 08a4d2a58..3397359dc 100644
--- a/documentation/contributing/environment.md
+++ b/documentation/contributing/environment.md
@@ -23,6 +23,19 @@ copy `.env.dist` to `.env` (gitignored) and set the shifted values there - `.env
 cp .env.dist .env
 ```
 
+> **Upgrading from an older checkout** - the local S3 service moved from MinIO to
+> [RustFS](https://rustfs.com/) (MinIO deleted its community images from Docker Hub) and the S3 credentials changed from
+> `minioadmin` to `flowphpaccess01` / `flowphpsecret01`. Refresh **both** files, otherwise every S3 request fails with
+> `SignatureDoesNotMatch`:
+>
+> ```shell
+> docker compose down -v
+> rm -rf var/minio
+> cp compose.yml.dist compose.yml
+> cp .env.dist .env          # or update S3_ACCESS_KEY_ID / S3_SECRET_ACCESS_KEY in your existing .env
+> docker compose up -d
+> ```
+
 > If you keep a personal gitignored `phpunit.xml`, regenerate it from `phpunit.xml.dist` after pulling this change: the
 > new `.dist` uses `bootstrap="bootstrap.php"` and no longer carries the `<php><env>` block (env now comes from `.env.dist`
 > / `.env`). A stale `phpunit.xml` keeps the old bootstrap and env, bypassing the shared config.