diff --git a/backend/codiki-exposition/src/main/java/org/codiki/exposition/user/UserController.java b/backend/codiki-exposition/src/main/java/org/codiki/exposition/user/UserController.java
index 87a7b49..3c3dd7f 100644
--- a/backend/codiki-exposition/src/main/java/org/codiki/exposition/user/UserController.java
+++ b/backend/codiki-exposition/src/main/java/org/codiki/exposition/user/UserController.java
@@ -12,6 +12,8 @@ import org.codiki.exposition.user.model.LoginRequest;
 import org.codiki.exposition.user.model.LoginResponse;
 import org.codiki.exposition.user.model.RefreshTokenRequest;
 import org.codiki.exposition.user.model.SignInRequestDto;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
@@ -23,9 +25,14 @@ import org.springframework.web.bind.annotation.RestController;
 @RequestMapping("/api/users")
 public class UserController {
     private final UserUseCases userUseCases;
+    private final boolean signupEnabled;
 
-    public UserController(UserUseCases userUseCases) {
+    public UserController(
+            UserUseCases userUseCases,
+            @Value("${application.signup.enabled:true}") boolean signupEnabled
+    ) {
         this.userUseCases = userUseCases;
+        this.signupEnabled = signupEnabled;
     }
 
     @PostMapping("/login")
@@ -49,7 +56,12 @@ public class UserController {
 
     @PostMapping
     @ResponseStatus(CREATED)
-    public void signIn(@RequestBody SignInRequestDto request) {
-        userUseCases.createUser(request.pseudo(), request.email(), request.password());
+    public ResponseEntity<Void> signIn(@RequestBody SignInRequestDto request) {
+        if (signupEnabled) {
+            userUseCases.createUser(request.pseudo(), request.email(), request.password());
+            return ResponseEntity.status(CREATED).build();
+        } else {
+            return ResponseEntity.notFound().build();
+        }
     }
 }
diff --git a/backend/codiki-launcher/src/main/resources/application.yml b/backend/codiki-launcher/src/main/resources/application.yml
index 78889d9..196381a 100644
--- a/backend/codiki-launcher/src/main/resources/application.yml
+++ b/backend/codiki-launcher/src/main/resources/application.yml
@@ -1,4 +1,6 @@
 application:
+  signup:
+    enabled: true
   security:
     jwt:
       secretKey: "secret-key"
diff --git a/docker-compose.yml b/docker-compose.yml
index 90972fa..c79c19f 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -20,6 +20,7 @@ services:
     container_name: "codiki-backend"
     environment:
       - "SPRING_PROFILES_ACTIVE=prod"
+      - "APPLICATION_SIGNUP_ENABLED=false"
     ports:
       - "50011:8080"
     volumes: