diff --git a/apps/client/src/components/ProjectResources.vue b/apps/client/src/components/ProjectResources.vue
index 68e074e684..4b6bba5cb4 100644
--- a/apps/client/src/components/ProjectResources.vue
+++ b/apps/client/src/components/ProjectResources.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import type { CleanedCluster, Cluster, CreateEnvironment, Environment, EnvironmentWithDeploymentsCount, Repo, Stage, UpdateEnvironment, Zone } from '@cpn-console/shared'
+import type { CleanedCluster, Cluster, CreateEnvironment, Environment, EnvironmentWithDeploymentsCount, Repo, Stage, SyncRepositoryBodyV2, UpdateEnvironment, Zone } from '@cpn-console/shared'
 import type { Project } from '@/utils/project-utils.js'
 import type { RepoFormResult } from '@/utils/repository-utils.js'
 import { logger } from '@cpn-console/logger/browser'
@@ -65,8 +65,8 @@ const canManageEnvs = computed(() => !props.project.locked && props.asProfile ==
 const canManageRepos = computed(() => !props.project.locked && props.asProfile === 'user' && ProjectAuthorized.ManageRepositories({ projectPermissions: props.project.myPerms }))
 const canListDeploy = computed(() => props.asProfile === 'admin' || ProjectAuthorized.ListDeployments({ projectPermissions: props.project.myPerms }))
 
-watch(selectedRepo, async () => {
-  branchName.value = defaultBranchName
+watch(selectedRepo, () => {
+  branchName.value = selectedRepo.value?.branchName ?? defaultBranchName
 })
 
 async function putEnvironment(environment: UpdateEnvironment, envId: Environment['id']) {
@@ -123,12 +123,17 @@ async function syncRepository() {
   const repo = selectedRepo.value
   if (!repo) return
   if (!isAllSyncing.value && !branchName.value) branchName.value = defaultBranchName
-  await props.project.Repositories.sync(
-    repo.id,
-    isAllSyncing.value
-      ? { syncAllBranches: true }
-      : { syncAllBranches: false, branchName: branchName.value },
-  )
+  const syncRequest: SyncRepositoryBodyV2 = isAllSyncing.value
+    ? { syncAllBranches: true }
+    : { syncAllBranches: false, branchName: branchName.value }
+  await props.project.Repositories.sync(repo.id, syncRequest)
+  if (!syncRequest.syncAllBranches) {
+    repositories.value = repositories.value.map(repository =>
+      repository.id === repo.id
+        ? { ...repository, branchName: syncRequest.branchName }
+        : repository,
+    )
+  }
   snackbarStore.setMessage(`Travail de synchronisation lancé pour le dépôt ${repo.internalRepoName}`)
 }
 
diff --git a/apps/client/src/utils/repository-utils.spec.ts b/apps/client/src/utils/repository-utils.spec.ts
index 87b877778f..5e4939f6c5 100644
--- a/apps/client/src/utils/repository-utils.spec.ts
+++ b/apps/client/src/utils/repository-utils.spec.ts
@@ -83,6 +83,12 @@ describe('toUpdateRepositoryBody', () => {
     expect(body).not.toHaveProperty('isStandalone')
   })
 
+  it('should omit the branch persisted by a synchronization', () => {
+    const body = toUpdateRepositoryBody(makeFormResult({ ...persisted, branchName: 'develop' }))
+
+    expect(body).not.toHaveProperty('branchName')
+  })
+
   it('should omit an unchanged token, signalled by the fakeToken placeholder', () => {
     const body = toUpdateRepositoryBody(makeFormResult({ ...persisted, isPrivate: true, externalUserName: 'this-is-tobi', externalToken: fakeToken }))
 
diff --git a/apps/client/src/utils/repository-utils.ts b/apps/client/src/utils/repository-utils.ts
index 8bec92d53b..4ed1f253e4 100644
--- a/apps/client/src/utils/repository-utils.ts
+++ b/apps/client/src/utils/repository-utils.ts
@@ -20,7 +20,7 @@ export function toCreateRepositoryBody(repo: RepoFormResult): CreateRepositoryBo
 }
 
 export function toUpdateRepositoryBody(repo: RepoFormResult): UpdateRepositoryBodyV2 {
-  const { externalToken, id: _id, projectId: _projectId, createdAt: _createdAt, updatedAt: _updatedAt, internalRepoName: _internalRepoName, isStandalone: _isStandalone, ...repositoryFields } = repo
+  const { externalToken, id: _id, projectId: _projectId, createdAt: _createdAt, updatedAt: _updatedAt, internalRepoName: _internalRepoName, branchName: _branchName, isStandalone: _isStandalone, ...repositoryFields } = repo
 
   return {
     ...repositoryFields,
diff --git a/apps/server-nestjs/src/modules/deployment/deployment-testing.utils.ts b/apps/server-nestjs/src/modules/deployment/deployment-testing.utils.ts
index d107a3138e..0c2280b62c 100644
--- a/apps/server-nestjs/src/modules/deployment/deployment-testing.utils.ts
+++ b/apps/server-nestjs/src/modules/deployment/deployment-testing.utils.ts
@@ -44,6 +44,7 @@ export function makeRepository(overrides: Partial<Repository> = {}): Repository
     id: faker.string.uuid(),
     projectId: faker.string.uuid(),
     internalRepoName: faker.string.alphanumeric(8).toLowerCase(),
+    branchName: 'main',
     externalRepoUrl: '',
     externalUserName: '',
     isInfra: false,
diff --git a/apps/server-nestjs/src/modules/repository/repository-datastore.service.spec.ts b/apps/server-nestjs/src/modules/repository/repository-datastore.service.spec.ts
index 351620b12a..d221cac15d 100644
--- a/apps/server-nestjs/src/modules/repository/repository-datastore.service.spec.ts
+++ b/apps/server-nestjs/src/modules/repository/repository-datastore.service.spec.ts
@@ -137,6 +137,20 @@ describe('repositoryDatastoreService', () => {
     })
   })
 
+  describe('updateBranchName', () => {
+    it('updates the persisted synchronization branch', async () => {
+      const repository = makeInternalRepository({ projectId })
+      prisma.repository.update.mockResolvedValue(repository)
+
+      await service.updateBranchName(repository.id, 'develop')
+
+      expect(prisma.repository.update).toHaveBeenCalledWith({
+        where: { id: repository.id },
+        data: { branchName: 'develop' },
+      })
+    })
+  })
+
   describe('deleteRepository', () => {
     it('returns the deleted repository', async () => {
       const repository = makeInternalRepository()
diff --git a/apps/server-nestjs/src/modules/repository/repository-datastore.service.ts b/apps/server-nestjs/src/modules/repository/repository-datastore.service.ts
index 8bfd8a8255..66758b5fac 100644
--- a/apps/server-nestjs/src/modules/repository/repository-datastore.service.ts
+++ b/apps/server-nestjs/src/modules/repository/repository-datastore.service.ts
@@ -37,6 +37,13 @@ export class RepositoryDatastoreService {
     })
   }
 
+  updateBranchName(repositoryId: string, branchName: string): Promise<Repository> {
+    return this.prisma.repository.update({
+      where: { id: repositoryId },
+      data: { branchName },
+    })
+  }
+
   deleteRepository(repositoryId: string): Promise<Repository> {
     return this.prisma.repository.delete({
       where: { id: repositoryId },
diff --git a/apps/server-nestjs/src/modules/repository/repository-testing.utils.ts b/apps/server-nestjs/src/modules/repository/repository-testing.utils.ts
index 5d5e008aae..5f4d16d271 100644
--- a/apps/server-nestjs/src/modules/repository/repository-testing.utils.ts
+++ b/apps/server-nestjs/src/modules/repository/repository-testing.utils.ts
@@ -8,6 +8,7 @@ export function makeRepository(overrides: Partial<Repository> = {}): Repository
     id: faker.string.uuid(),
     projectId: faker.string.uuid(),
     internalRepoName: faker.string.alphanumeric(8).toLowerCase(),
+    branchName: 'main',
     externalRepoUrl: '',
     externalUserName: '',
     isInfra: false,
diff --git a/apps/server-nestjs/src/modules/repository/repository.service.spec.ts b/apps/server-nestjs/src/modules/repository/repository.service.spec.ts
index f63441224f..ac1db17251 100644
--- a/apps/server-nestjs/src/modules/repository/repository.service.spec.ts
+++ b/apps/server-nestjs/src/modules/repository/repository.service.spec.ts
@@ -321,16 +321,27 @@ describe('repositoryService', () => {
         },
         { action: 'Sync Repository', userId, requestId },
       )
+      expect(datastore.updateBranchName).not.toHaveBeenCalled()
     })
 
-    it('forwards the requested branch when not syncing every branch', async () => {
+    it('persists the requested branch before triggering its mirror', async () => {
       const repository = makeRepository({ id: repositoryId, projectId })
       const branchName = faker.git.branch()
+      const calls: string[] = []
       datastore.getRepositoryById.mockResolvedValue(repository)
-      appEvents.emitRepositoryEvent.mockResolvedValue({})
+      datastore.updateBranchName.mockImplementation(async () => {
+        calls.push('persist')
+        return repository
+      })
+      appEvents.emitRepositoryEvent.mockImplementation(async () => {
+        calls.push('mirror')
+        return {}
+      })
 
       await service.syncRepository(projectId, projectSlug, repositoryId, { syncAllBranches: false, branchName }, userId, requestId)
 
+      expect(datastore.updateBranchName).toHaveBeenCalledWith(repositoryId, branchName)
+      expect(calls).toEqual(['persist', 'mirror'])
       expect(appEvents.emitRepositoryEvent).toHaveBeenCalledWith(
         'repository.sync',
         expect.objectContaining({ syncAllBranches: false, branchName }),
@@ -338,14 +349,18 @@ describe('repositoryService', () => {
       )
     })
 
-    it('rejects with 422 when a plugin fails the synchronization', async () => {
-      datastore.getRepositoryById.mockResolvedValue(makeRepository({ id: repositoryId, projectId }))
+    it('keeps the requested branch when a plugin fails the synchronization', async () => {
+      const branchName = faker.git.branch()
+      const repository = makeRepository({ id: repositoryId, projectId })
+      datastore.getRepositoryById.mockResolvedValue(repository)
+      datastore.updateBranchName.mockResolvedValue(repository)
       appEvents.emitRepositoryEvent.mockResolvedValue({
         gitlab: { status: 'KO', message: 'Unable to find mirror repository', executionTime: 1, error: new Error('boom') },
       })
 
-      await expect(service.syncRepository(projectId, projectSlug, repositoryId, syncRequest, userId, requestId))
+      await expect(service.syncRepository(projectId, projectSlug, repositoryId, { syncAllBranches: false, branchName }, userId, requestId))
         .rejects.toThrow(UnprocessableEntityException)
+      expect(datastore.updateBranchName).toHaveBeenCalledWith(repositoryId, branchName)
     })
 
     it('rejects when the repository belongs to another project', async () => {
@@ -353,6 +368,7 @@ describe('repositoryService', () => {
 
       await expect(service.syncRepository(projectId, projectSlug, repositoryId, syncRequest, userId, requestId))
         .rejects.toThrow(NotFoundException)
+      expect(datastore.updateBranchName).not.toHaveBeenCalled()
       expect(appEvents.emitRepositoryEvent).not.toHaveBeenCalled()
     })
   })
diff --git a/apps/server-nestjs/src/modules/repository/repository.service.ts b/apps/server-nestjs/src/modules/repository/repository.service.ts
index 256db880d0..c1f5bcbd06 100644
--- a/apps/server-nestjs/src/modules/repository/repository.service.ts
+++ b/apps/server-nestjs/src/modules/repository/repository.service.ts
@@ -85,6 +85,10 @@ export class RepositoryService {
   async syncRepository(projectId: string, projectSlug: string, repositoryId: string, syncRequest: SyncRepository, userId: string, requestId: string): Promise<void> {
     const repository = await this.getProjectRepositoryOrThrow(projectId, repositoryId)
 
+    if (!syncRequest.syncAllBranches) {
+      await this.repositoryDatastoreService.updateBranchName(repositoryId, syncRequest.branchName)
+    }
+
     const results = await this.syncRepositoryMirror(
       {
         projectId,
diff --git a/apps/server-nestjs/src/prisma/migrations/20260923150000_add_repository_branch_name/migration.sql b/apps/server-nestjs/src/prisma/migrations/20260923150000_add_repository_branch_name/migration.sql
new file mode 100644
index 0000000000..e306cf5252
--- /dev/null
+++ b/apps/server-nestjs/src/prisma/migrations/20260923150000_add_repository_branch_name/migration.sql
@@ -0,0 +1 @@
+ALTER TABLE "Repository" ADD COLUMN "branchName" TEXT NOT NULL DEFAULT 'main';
diff --git a/apps/server-nestjs/src/prisma/schema/project.prisma b/apps/server-nestjs/src/prisma/schema/project.prisma
index 94d33c7894..f7db83366c 100644
--- a/apps/server-nestjs/src/prisma/schema/project.prisma
+++ b/apps/server-nestjs/src/prisma/schema/project.prisma
@@ -75,6 +75,7 @@ model Repository {
   id                             String                          @id @default(uuid()) @db.Uuid
   projectId                      String                          @db.Uuid
   internalRepoName               String
+  branchName                     String                          @default("main")
   externalRepoUrl                String                          @default("")
   externalUserName               String                          @default("")
   isInfra                        Boolean                         @default(false)
diff --git a/apps/server/src/prisma/migrations/20260923150000_add_repository_branch_name/migration.sql b/apps/server/src/prisma/migrations/20260923150000_add_repository_branch_name/migration.sql
new file mode 100644
index 0000000000..e306cf5252
--- /dev/null
+++ b/apps/server/src/prisma/migrations/20260923150000_add_repository_branch_name/migration.sql
@@ -0,0 +1 @@
+ALTER TABLE "Repository" ADD COLUMN "branchName" TEXT NOT NULL DEFAULT 'main';
diff --git a/apps/server/src/prisma/schema/project.prisma b/apps/server/src/prisma/schema/project.prisma
index 94d33c7894..f7db83366c 100644
--- a/apps/server/src/prisma/schema/project.prisma
+++ b/apps/server/src/prisma/schema/project.prisma
@@ -75,6 +75,7 @@ model Repository {
   id                             String                          @id @default(uuid()) @db.Uuid
   projectId                      String                          @db.Uuid
   internalRepoName               String
+  branchName                     String                          @default("main")
   externalRepoUrl                String                          @default("")
   externalUserName               String                          @default("")
   isInfra                        Boolean                         @default(false)
diff --git a/packages/shared/src/contracts/repository.ts b/packages/shared/src/contracts/repository.ts
index 131deee00e..870c9632a4 100644
--- a/packages/shared/src/contracts/repository.ts
+++ b/packages/shared/src/contracts/repository.ts
@@ -12,7 +12,7 @@ export const repositoryContract = contractInstance.router({
     contentType: 'application/json',
     summary: 'Create repo',
     description: 'Create new repo.',
-    body: RepoSchema.omit({ id: true, createdAt: true, updatedAt: true }),
+    body: RepoSchema.omit({ id: true, createdAt: true, updatedAt: true, branchName: true }),
     responses: {
       201: RepoSchema,
       400: ErrorSchema,
@@ -71,7 +71,7 @@ export const repositoryContract = contractInstance.router({
       repositoryId: z.string()
         .uuid(),
     }),
-    body: RepoSchema.omit({ createdAt: true, updatedAt: true }).partial(),
+    body: RepoSchema.omit({ createdAt: true, updatedAt: true, branchName: true }).partial(),
     responses: {
       200: RepoSchema,
       500: ErrorSchema,
diff --git a/packages/shared/src/schemas/repository.spec.ts b/packages/shared/src/schemas/repository.spec.ts
new file mode 100644
index 0000000000..bff90ea58f
--- /dev/null
+++ b/packages/shared/src/schemas/repository.spec.ts
@@ -0,0 +1,21 @@
+import { faker } from '@faker-js/faker'
+import { describe, expect, it } from 'vitest'
+import { defaultBranchName } from '../utils/const.js'
+import { RepoSchema } from './repository.js'
+
+describe('repoSchema', () => {
+  it('defaults a repository response without a branch to main', () => {
+    const repository = RepoSchema.parse({
+      id: faker.string.uuid(),
+      projectId: faker.string.uuid(),
+      internalRepoName: 'my-repo',
+      externalRepoUrl: '',
+      isPrivate: false,
+      isInfra: false,
+      createdAt: faker.date.past().toISOString(),
+      updatedAt: faker.date.past().toISOString(),
+    })
+
+    expect(repository.branchName).toBe(defaultBranchName)
+  })
+})
diff --git a/packages/shared/src/schemas/repository.ts b/packages/shared/src/schemas/repository.ts
index 85675b9123..ecb9bc33c5 100644
--- a/packages/shared/src/schemas/repository.ts
+++ b/packages/shared/src/schemas/repository.ts
@@ -1,6 +1,6 @@
 import type Zod from 'zod'
 import { z } from 'zod'
-import { forbiddenRepoNames, invalidGitUrl, invalidInternalRepoName, missingCredentials } from '../utils/const.js'
+import { defaultBranchName, forbiddenRepoNames, invalidGitUrl, invalidInternalRepoName, missingCredentials } from '../utils/const.js'
 import { AtDatesToStringExtend } from './_utils.js'
 
 export const RepoSchema = z.object({
@@ -26,6 +26,8 @@ export const RepoSchema = z.object({
     .optional(),
   projectId: z.string()
     .uuid(),
+  branchName: z.string()
+    .default(defaultBranchName),
   // Optional deployment settings for infra repositories
   deployRevision: z.string().optional(),
   deployPath: z.string().optional(),
diff --git a/packages/shared/src/utils/schemas.spec.ts b/packages/shared/src/utils/schemas.spec.ts
index 6a1aac3a71..f1e3761f8d 100644
--- a/packages/shared/src/utils/schemas.spec.ts
+++ b/packages/shared/src/utils/schemas.spec.ts
@@ -2,7 +2,7 @@ import type { Log, ProjectV2 } from '../index.js'
 import { faker } from '@faker-js/faker'
 import { describe, expect, it } from 'vitest'
 import { ZodError } from 'zod'
-import { ClusterDetailsSchema, ClusterPrivacy, ClusterUsageSchema, descriptionMaxLength, EnvironmentSchema, instanciateSchema, LogSchema, parseZodError, ProjectSchemaV2, RepoSchema, StageSchema, UserSchema } from '../index.js'
+import { ClusterDetailsSchema, ClusterPrivacy, ClusterUsageSchema, defaultBranchName, descriptionMaxLength, EnvironmentSchema, instanciateSchema, LogSchema, parseZodError, ProjectSchemaV2, RepoSchema, StageSchema, UserSchema } from '../index.js'
 
 describe('schemas utils', () => {
   it('should delete config in log', () => {
@@ -44,6 +44,7 @@ describe('schemas utils', () => {
       id: faker.string.uuid(),
       projectId: faker.string.uuid(),
       internalRepoName: 'candilib',
+      branchName: defaultBranchName,
       externalRepoUrl: 'https://github.com/LAB-MI/candilibV2.git',
       externalToken: 'eddddsqsq-_',
       isPrivate: true,
@@ -159,6 +160,7 @@ describe('schemas utils', () => {
       id: faker.string.uuid(),
       projectId: faker.string.uuid(),
       internalRepoName: 'candilib',
+      branchName: defaultBranchName,
       externalRepoUrl: 'https://github.com/LAB-MI/candilibV2.git',
       externalUserName: 'clairenlet',
       externalToken: 'myToken',
@@ -213,6 +215,7 @@ describe('schemas utils', () => {
       id: faker.string.uuid(),
       projectId: faker.string.uuid(),
       internalRepoName: '-candilib',
+      branchName: defaultBranchName,
       externalRepoUrl: 'https://github.com/LAB-MI/candilibV2.git',
       isPrivate: false,
       isInfra: false,
diff --git a/packages/test-utils/src/utils/random-utils.ts b/packages/test-utils/src/utils/random-utils.ts
index 3f78ccf346..64a1f275ad 100644
--- a/packages/test-utils/src/utils/random-utils.ts
+++ b/packages/test-utils/src/utils/random-utils.ts
@@ -94,6 +94,7 @@ export function getRandomRepo(projectId = faker.string.uuid()): Repository {
     id: faker.string.uuid(),
     projectId,
     internalRepoName: faker.lorem.word(),
+    branchName: 'main',
     externalRepoUrl: getRandomGitUrl(),
     isPrivate: faker.datatype.boolean(),
     isInfra: faker.datatype.boolean(),
diff --git a/packages/test-utils/src/utils/types.ts b/packages/test-utils/src/utils/types.ts
index 14eaf73bb8..b4faafdc38 100644
--- a/packages/test-utils/src/utils/types.ts
+++ b/packages/test-utils/src/utils/types.ts
@@ -2,6 +2,7 @@ export interface Repository {
   id: string
   projectId: string
   internalRepoName: string
+  branchName: string
   externalRepoUrl: string
   isPrivate: boolean
   isInfra: boolean
diff --git a/playwright/e2e-tests/repos.spec.ts b/playwright/e2e-tests/repos.spec.ts
index 41362ea716..21309c2179 100644
--- a/playwright/e2e-tests/repos.spec.ts
+++ b/playwright/e2e-tests/repos.spec.ts
@@ -14,6 +14,7 @@ import {
   invalidInternalRepoErrorMessage,
 } from '../helpers/constants'
 import { createProject, projectSlugTextRegexp } from '../helpers/project'
+import { createRepository as createRepositoryThroughUi } from '../helpers/repository'
 
 test.describe('Repositories', () => {
   // @TODO: Rework this Cypress-inherited test (use of following-sibling is a
@@ -501,6 +502,11 @@ test.describe('Repositories', () => {
       await expect(
         page.getByTestId(`repoTr-${repo.internalRepoName}`),
       ).toBeVisible()
+      const secondRepositoryName = await createRepositoryThroughUi({
+        page,
+        repositoryName: 'repo04',
+        externalRepoUrlInput: 'https://github.com/externalUser04/repo04.git',
+      })
 
       // Assert - Update repository
       await page.getByTestId(`repoTr-repo03`).click()
@@ -537,6 +543,17 @@ test.describe('Repositories', () => {
           'Travail de synchronisation lancé pour le dépôt repo03Fermer le message',
         ),
       ).toBeVisible()
+      await page.getByTestId('resource-modal').getByRole('button', { name: 'Fermer' }).click()
+      await page.getByTestId(`repoTr-${repo.internalRepoName}`).click()
+      await expect(page.getByTestId('branchNameInput')).toHaveValue('develop')
+      await page.getByTestId('resource-modal').getByRole('button', { name: 'Fermer' }).click()
+      await page.reload()
+      await expect(page.locator('h1')).toContainText(projectName)
+      await page.getByTestId(`repoTr-${repo.internalRepoName}`).click()
+      await expect(page.getByTestId('branchNameInput')).toHaveValue('develop')
+      await page.getByTestId('resource-modal').getByRole('button', { name: 'Fermer' }).click()
+      await page.getByTestId(`repoTr-${secondRepositoryName}`).click()
+      await expect(page.getByTestId('branchNameInput')).toHaveValue('main')
     },
   )