diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bd13dd2..1472434 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
           # fil du temps (une release Flutter peut casser la CI sans aucun
           # changement dans le dépôt). Le cache évite de retélécharger SDK et
           # dépendances pub à chaque run.
-          flutter-version: 3.38.4
+          flutter-version: 3.47.6
           channel: stable
           cache: true
       - run: flutter pub get
@@ -42,7 +42,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dart-lang/setup-dart@v1
         with:
-          sdk: 3.13.2
+          sdk: 3.13.5
       - run: dart pub get
       - run: dart analyze
       - run: dart test
diff --git a/Dockerfile b/Dockerfile
index 7a8be61..d408095 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,26 @@
 # Stage 1: Build Environment (Optimized for Docker Caching)
-FROM ghcr.io/cirruslabs/flutter:stable AS builder
+# SDK Flutter officiel, version épinglée — la même que la CI. L'image
+# ghcr.io/cirruslabs/flutter:stable n'est plus mise à jour : elle était
+# restée sur Flutter 3.44.0 / Dart 3.12.0 (mai 2026), loin derrière la
+# version stable réelle.
+FROM debian:stable-slim AS builder
+
+ARG FLUTTER_VERSION=3.47.6
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    curl \
+    git \
+    unzip \
+    xz-utils \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_${FLUTTER_VERSION}-stable.tar.xz" \
+    | tar -xJ -C /opt \
+    && git config --global --add safe.directory /opt/flutter
+
+ENV PATH="/opt/flutter/bin:/opt/flutter/bin/cache/dart-sdk/bin:${PATH}"
 
-USER root
 WORKDIR /app
 
 # Optimize DART VM Memory
diff --git a/bin/pubspec.lock b/bin/pubspec.lock
index bddb80c..318f579 100644
--- a/bin/pubspec.lock
+++ b/bin/pubspec.lock
@@ -474,4 +474,4 @@ packages:
     source: hosted
     version: "3.1.3"
 sdks:
-  dart: ">=3.11.0 <4.0.0"
+  dart: ">=3.13.0 <4.0.0"
diff --git a/bin/pubspec.yaml b/bin/pubspec.yaml
index 589c351..7aac5e9 100644
--- a/bin/pubspec.yaml
+++ b/bin/pubspec.yaml
@@ -4,7 +4,7 @@ publish_to: 'none'
 version: 1.0.0+1
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: ^3.13.0
 
 dependencies:
   shelf: ^1.4.1
diff --git a/pubspec.lock b/pubspec.lock
index 8cbf66c..0cb8b6b 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -1262,5 +1262,5 @@ packages:
     source: hosted
     version: "3.1.3"
 sdks:
-  dart: ">=3.10.3 <4.0.0"
+  dart: ">=3.13.0 <4.0.0"
   flutter: ">=3.38.4"
diff --git a/pubspec.yaml b/pubspec.yaml
index ae1c237..d80bb74 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ publish_to: 'none'
 version: 1.0.0+1
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: ^3.13.0
 
 dependencies:
   flutter: