diff --git a/README.md b/README.md
index c7b2918..28f1609 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@
 
 | Composant | Technologie |
 |-----------|-------------|
-| Framework | Quarkus 3.16.3 |
+| Framework | Quarkus 3.27.3 LTS |
 | API | Quarkus REST (RESTEasy Reactive) + Jackson |
 | Auth | JWT HS256 + `quarkus-oidc` (Keycloak) |
 | ORM | Hibernate ORM Panache |
@@ -58,7 +58,7 @@
 
 ### Prérequis
 
-- Java 17+ (21 recommandé)
+- Java 21 LTS
 - Maven 3.9+
 - PostgreSQL sur `localhost:5432` (DB : `afterwork`)
 - Keycloak sur `localhost:8180` (realm à configurer)
@@ -176,6 +176,7 @@ src/main/
 ## Historique récent
 
 - **2026-04-24** — Refactor `mic-after-work-server-impl-quarkus-main` → `afterwork-server-impl-quarkus` (Gitea repo, artifactId, DB `afterwork`, ingress path `/afterwork`, ExternalSecrets ESO). Déployé en prod via lionsctl pipeline.
+- **2026-04-24** — Upgrade Quarkus **3.16.3 → 3.27.3 LTS** + Java **17 → 21** (cohérence avec les autres backends de l'écosystème).
 
 ---
 
diff --git a/pom.xml b/pom.xml
index 66770e0..5485ca3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,12 +7,12 @@
 
     <properties>
         <compiler-plugin.version>3.13.0</compiler-plugin.version>
-        <maven.compiler.release>17</maven.compiler.release>
+        <maven.compiler.release>21</maven.compiler.release>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <quarkus.platform.artifact-id>quarkus-bom</quarkus.platform.artifact-id>
         <quarkus.platform.group-id>io.quarkus.platform</quarkus.platform.group-id>
-        <quarkus.platform.version>3.16.3</quarkus.platform.version>
+        <quarkus.platform.version>3.27.3</quarkus.platform.version>
         <quarkus.package.type>fast-jar</quarkus.package.type>
         <skipITs>true</skipITs>
         <surefire-plugin.version>3.5.0</surefire-plugin.version>