diff --git a/back/src/modules/apis/apis.controller.ts b/back/src/modules/apis/apis.controller.ts
index 66cc76f..77218b9 100644
--- a/back/src/modules/apis/apis.controller.ts
+++ b/back/src/modules/apis/apis.controller.ts
@@ -64,6 +64,11 @@ export class ApisController {
     res.send(entry.yamlContent);
   }
 
+  @Get(':id/versions')
+  getVersions(@Param('id') id: string) {
+    return this.apisService.findVersionsOf(id);
+  }
+
   /** Sert les assets statiques (CSS, JS) générés par AsyncAPI CLI */
   @Get(':id/*path')
   async getDocAsset(@Param('id') id: string, @Req() req: Request, @Res() res: Response) {
diff --git a/back/src/modules/apis/apis.service.ts b/back/src/modules/apis/apis.service.ts
index 31c1a2a..87d77d7 100644
--- a/back/src/modules/apis/apis.service.ts
+++ b/back/src/modules/apis/apis.service.ts
@@ -4,7 +4,7 @@ import { Repository } from 'typeorm';
 import { ApiEntryEntity } from './api-entry.entity';
 import { CreateApiEntryDto } from './dto/create-api-entry.dto';
 import { UpdateApiEntryDto } from './dto/update-api-entry.dto';
-import { ApiListResponse, ApiListQuery, ApiEntry, ApiType, ApiConvention, API_CONVENTION_LABELS } from '@datacat/shared';
+import { ApiListResponse, ApiListQuery, ApiEntry, ApiEntryListItem, ApiType, ApiStatus, ApiConvention, API_CONVENTION_LABELS } from '@datacat/shared';
 import { toApiEntryListItem } from './api-entry.mapper';
 import { DocsGenerationService } from '../docs-generation/docs-generation.service';
 
@@ -107,6 +107,19 @@ export class ApisService {
     await this.repo.delete(id);
   }
 
+  async findVersionsOf(id: string): Promise<ApiEntryListItem[]> {
+    const entry = await this.findOneOrThrow(id);
+    const entities = await this.repo.find({
+      where: { name: entry.name, convention: entry.convention },
+      order: {
+        versionMajor: 'DESC',
+        versionMinor: 'DESC',
+        versionPatch: 'DESC',
+      },
+    });
+    return entities.map(toApiEntryListItem);
+  }
+
   async regenerate(id: string): Promise<ApiEntry> {
     await this.findOneOrThrow(id);
     await this.updateInternal(id, { status: 'PENDING', errorMessage: null });
diff --git a/back/src/modules/seeder/seeder.service.ts b/back/src/modules/seeder/seeder.service.ts
index 00b39ca..a2de0eb 100644
--- a/back/src/modules/seeder/seeder.service.ts
+++ b/back/src/modules/seeder/seeder.service.ts
@@ -765,6 +765,46 @@ export class SeederService implements OnApplicationBootstrap {
         contactTechnicalEntity: 'API Commerce',
         contactTechnicalEmail: 'api-orders@example.com',
       }),
+      this.apiRepo.create({
+        convention: 'CONSULTER',
+        name: 'Référentiel Produits',
+        versionMajor: 3,
+        versionMinor: 0,
+        versionPatch: 3,
+        description:
+          'A sample API that uses a petstore as an example to demonstrate features in the OpenAPI specification.',
+        type: 'OPENAPI',
+        yamlContent: PETSTORE_YAML,
+        status: 'PENDING',
+        categoryId: produits.id,
+        provider: 'DINUM',
+        contactFunctionalName: 'Alice Martin',
+        contactFunctionalEntity: 'Équipe Produit',
+        contactFunctionalEmail: 'alice.martin@example.gouv.fr',
+        contactTechnicalName: 'Bob Dupont',
+        contactTechnicalEntity: 'Équipe API',
+        contactTechnicalEmail: 'bob.dupont@example.gouv.fr',
+      }),
+      this.apiRepo.create({
+        convention: 'CONSULTER',
+        name: 'Référentiel Produits',
+        versionMajor: 3,
+        versionMinor: 0,
+        versionPatch: 2,
+        description:
+          'A sample API that uses a petstore as an example to demonstrate features in the OpenAPI specification.',
+        type: 'OPENAPI',
+        yamlContent: PETSTORE_YAML,
+        status: 'PENDING',
+        categoryId: produits.id,
+        provider: 'DINUM',
+        contactFunctionalName: 'Alice Martin',
+        contactFunctionalEntity: 'Équipe Produit',
+        contactFunctionalEmail: 'alice.martin@example.gouv.fr',
+        contactTechnicalName: 'Bob Dupont',
+        contactTechnicalEntity: 'Équipe API',
+        contactTechnicalEmail: 'bob.dupont@example.gouv.fr',
+      }),
       this.apiRepo.create({
         convention: 'CONSULTER',
         name: 'Authentification JWT',
@@ -786,7 +826,7 @@ export class SeederService implements OnApplicationBootstrap {
       }),
     ]);
 
-    console.log('[Seeder] 8 catégories et 5 APIs de démo créées — génération docs en cours...');
+    console.log('[Seeder] 8 catégories et 7 APIs de démo créées — génération docs en cours...');
 
     /* Déclenche la génération de docs en fire-and-forget pour chaque API */
     for (const entry of entries) {
diff --git a/front-public/src/app/core/api.service.ts b/front-public/src/app/core/api.service.ts
index 9a4a201..e10a60c 100644
--- a/front-public/src/app/core/api.service.ts
+++ b/front-public/src/app/core/api.service.ts
@@ -1,7 +1,7 @@
 import { Injectable, inject } from '@angular/core';
 import { HttpClient } from '@angular/common/http';
 import { Observable } from 'rxjs';
-import { ApiEntry, ApiListResponse, ApiListQuery } from '@datacat/shared';
+import { ApiEntry, ApiEntryListItem, ApiListResponse, ApiListQuery } from '@datacat/shared';
 
 @Injectable({ providedIn: 'root' })
 export class ApiService {
@@ -45,6 +45,10 @@ export class ApiService {
     return this.http.delete<void>(`${this.baseUrl}/${id}`);
   }
 
+  getVersions(id: string): Observable<ApiEntryListItem[]> {
+    return this.http.get<ApiEntryListItem[]>(`${this.baseUrl}/${id}/versions`);
+  }
+
   regenerate(id: string): Observable<ApiEntry> {
     return this.http.post<ApiEntry>(`${this.baseUrl}/${id}/regenerate`, {});
   }
diff --git a/front-public/src/app/pages/api-detail/api-detail.component.ts b/front-public/src/app/pages/api-detail/api-detail.component.ts
index f026961..e92543a 100644
--- a/front-public/src/app/pages/api-detail/api-detail.component.ts
+++ b/front-public/src/app/pages/api-detail/api-detail.component.ts
@@ -9,9 +9,10 @@ import {
 } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { ActivatedRoute, Router, RouterLink } from '@angular/router';
+import { Subscription } from 'rxjs';
 import { ApiService } from '../../core/api.service';
 import { CategoryService } from '../../core/category.service';
-import { ApiEntry, Category, ApiConvention } from '@datacat/shared';
+import { ApiEntry, ApiEntryListItem, Category, ApiConvention } from '@datacat/shared';
 
 @Component({
   selector: 'app-api-detail',
@@ -63,6 +64,16 @@ import { ApiEntry, Category, ApiConvention } from '@datacat/shared';
               <span class="fr-tag">v{{ entry.version }}</span>
               <span [class]="badgeClass(entry.status)">{{ entry.status }}</span>
             </div>
+            @if (versions().length > 1) {
+              <div class="fr-select-group fr-mt-2w" style="max-width:200px">
+                <label class="fr-label" for="version-select">Version</label>
+                <select class="fr-select" id="version-select" (change)="onVersionChange($event)">
+                  @for (v of versions(); track v.id) {
+                    <option [value]="v.id" [selected]="v.id === entry.id">{{ v.version }}</option>
+                  }
+                </select>
+              </div>
+            }
           </div>
         </div>
 
@@ -155,6 +166,9 @@ import { ApiEntry, Category, ApiConvention } from '@datacat/shared';
           <button class="fr-btn fr-btn--secondary" (click)="openEdit()">
             Modifier
           </button>
+          <button class="fr-btn fr-btn--secondary fr-btn--icon-left fr-icon-add-line" (click)="onNewVersion()">
+            Nouvelle version
+          </button>
           <a
             [href]="'/api/apis/' + entry.id + '/yaml'"
             class="fr-btn fr-btn--secondary"
@@ -354,6 +368,7 @@ export class ApiDetailComponent implements OnInit, OnDestroy {
   private categoryService = inject(CategoryService);
 
   api = signal<ApiEntry | null>(null);
+  versions = signal<ApiEntryListItem[]>([]);
   categoryBreadcrumb = signal<Category[]>([]);
   loading = signal(false);
   error = signal<string | null>(null);
@@ -388,17 +403,37 @@ export class ApiDetailComponent implements OnInit, OnDestroy {
   });
 
   private pollInterval: ReturnType<typeof setInterval> | null = null;
+  private routeSub: Subscription | null = null;
   private id = '';
 
   ngOnInit() {
-    this.id = this.route.snapshot.paramMap.get('id') ?? '';
-    this.loadApi();
+    this.routeSub = this.route.paramMap.subscribe((params) => {
+      this.id = params.get('id') ?? '';
+      this.api.set(null);
+      this.versions.set([]);
+      this.error.set(null);
+      this.categoryBreadcrumb.set([]);
+      this.clearPoll();
+      this.loadApi();
+    });
   }
 
   ngOnDestroy() {
+    this.routeSub?.unsubscribe();
     this.clearPoll();
   }
 
+  onVersionChange(event: Event): void {
+    const id = (event.target as HTMLSelectElement).value;
+    if (id && id !== this.api()?.id) {
+      this.router.navigate(['/catalog', id]);
+    }
+  }
+
+  onNewVersion(): void {
+    this.router.navigate(['/upload'], { queryParams: { from: this.api()?.id } });
+  }
+
   onRegenerate() {
     this.regenerating.set(true);
     this.apiService.regenerate(this.id).subscribe({
@@ -494,6 +529,10 @@ export class ApiDetailComponent implements OnInit, OnDestroy {
         this.api.set(entry);
         this.loading.set(false);
         this.startPollIfPending();
+        this.apiService.getVersions(this.id).subscribe({
+          next: (v) => this.versions.set(v),
+          error: () => {},
+        });
         if (entry.categoryId) {
           this.categoryService.browse(entry.categoryId).subscribe({
             next: (data) => this.categoryBreadcrumb.set(data.breadcrumb),
diff --git a/front-public/src/app/pages/upload/upload.component.ts b/front-public/src/app/pages/upload/upload.component.ts
index 9e66fc7..16fe2cc 100644
--- a/front-public/src/app/pages/upload/upload.component.ts
+++ b/front-public/src/app/pages/upload/upload.component.ts
@@ -12,7 +12,7 @@ import { ReactiveFormsModule, FormBuilder, Validators } from '@angular/forms';
 import { Router, RouterLink, ActivatedRoute } from '@angular/router';
 import { ApiService } from '../../core/api.service';
 import { CategoryService } from '../../core/category.service';
-import { Category, API_CONVENTION_LABELS, ApiConvention } from '@datacat/shared';
+import { ApiEntry, Category, API_CONVENTION_LABELS, ApiConvention } from '@datacat/shared';
 
 @Component({
   selector: 'app-upload',
@@ -526,7 +526,10 @@ export class UploadComponent implements OnInit {
   }
 
   ngOnInit() {
-    const preselectedCategoryId = this.route.snapshot.queryParamMap.get('categoryId');
+    const params = this.route.snapshot.queryParamMap;
+    const preselectedCategoryId = params.get('categoryId');
+    const fromId = params.get('from');
+
     this.categoryService.list().subscribe({
       next: (res) => {
         this.categories.set(res.items);
@@ -535,6 +538,32 @@ export class UploadComponent implements OnInit {
         }
       },
     });
+
+    if (fromId) {
+      this.apiService.get(fromId).subscribe({
+        next: (api) => this.prefillFromApi(api),
+        error: () => {},
+      });
+    }
+  }
+
+  private prefillFromApi(api: ApiEntry): void {
+    this.metaForm.patchValue({
+      convention: api.convention,
+      name: api.name,
+      provider: api.provider,
+      versionMajor: api.versionMajor,
+      versionMinor: api.versionMinor,
+      versionPatch: api.versionPatch + 1,
+      description: api.description ?? '',
+      categoryId: api.categoryId ?? '',
+      contactFunctionalName: api.contactFunctionalName,
+      contactFunctionalEntity: api.contactFunctionalEntity,
+      contactFunctionalEmail: api.contactFunctionalEmail,
+      contactTechnicalName: api.contactTechnicalName,
+      contactTechnicalEntity: api.contactTechnicalEntity,
+      contactTechnicalEmail: api.contactTechnicalEmail,
+    });
   }
 
   categoryLabel(cat: Category): string {