diff --git a/backend/model/tribe.py b/backend/model/tribe.py
index b4c5a28..2783ef1 100644
--- a/backend/model/tribe.py
+++ b/backend/model/tribe.py
@@ -45,6 +45,9 @@ class Tribe:
             return self.name == other.name
         return False
 
+    def __hash__(self) -> int:
+        return hash(self.name)
+
     def to_dict(self) -> dict:
         return {"name": self.name, "level": self.level}
 
diff --git a/backend/service/services.py b/backend/service/services.py
index 1c874b0..39a6b1a 100644
--- a/backend/service/services.py
+++ b/backend/service/services.py
@@ -7,6 +7,10 @@ class TribeExists(Exception):
     pass
 
 
+class TribeDosNotExists(Exception):
+    pass
+
+
 def add_tribe(name: str, level: str, tribe_repo: AbstractRepository, conn):
     tribe = Tribe(name=name, level=level)
     try:
@@ -15,3 +19,13 @@ def add_tribe(name: str, level: str, tribe_repo: AbstractRepository, conn):
         raise TribeExists(f"The tribe {tribe.name} already exists")
     conn.commit()
     return tribe
+
+
+def update_tribe(name: str, level: str, tribe_repo: AbstractRepository, conn):
+    tribe = Tribe(name=name, level=level)
+    try:
+        tribe_repo.update(name=name, tribe=tribe)
+    except TribeRepositoryError:
+        raise TribeDosNotExists(f"The tribe {name} does not exists you can't update it")
+    conn.commit()
+    return tribe
diff --git a/tests/unit/test_service.py b/tests/unit/test_service.py
index 365379a..0a87ef5 100644
--- a/tests/unit/test_service.py
+++ b/tests/unit/test_service.py
@@ -6,7 +6,7 @@ from backend.repository.abstract_repository import AbstractRepository
 from backend.repository.student_sqlite_repository import StudentRepositoryError
 from backend.repository.tribe_sqlite_repository import TribeRepositoryError
 from backend.service import services
-from backend.service.services import TribeExists
+from backend.service.services import TribeDosNotExists, TribeExists
 from tests.model.fakes import build_tribes
 
 
@@ -112,3 +112,31 @@ def test_add_tribe_fail_exists():
         )
 
     assert conn.committed == False
+
+
+def test_update_tribe():
+    tribes = build_tribes(3)
+    tribe_repo = FakeTribeRepository(tribes)
+    conn = FakeConn()
+
+    other_level = "iouiouiou"
+    tribes[0].level = other_level
+    services.update_tribe(
+        name=tribes[0].name, level=other_level, tribe_repo=tribe_repo, conn=conn
+    )
+
+    assert conn.committed == True
+    assert set(tribe_repo.list()) == set(tribes)
+
+
+def test_update_tribe_fail_not_exists():
+    tribes = build_tribes(3)
+    tribe_repo = FakeTribeRepository(tribes)
+    conn = FakeConn()
+
+    with pytest.raises(TribeDosNotExists):
+        services.update_tribe(
+            name="azerty", level="jkl", tribe_repo=tribe_repo, conn=conn
+        )
+
+    assert conn.committed == False