diff --git a/fittrackee/config.py b/fittrackee/config.py
index 8f5bcda6..bf95725a 100644
--- a/fittrackee/config.py
+++ b/fittrackee/config.py
@@ -65,6 +65,7 @@ class TestingConfig(BaseConfig):
     TOKEN_EXPIRATION_DAYS = 0
     TOKEN_EXPIRATION_SECONDS = 3
     PASSWORD_TOKEN_EXPIRATION_SECONDS = 3
+    OAUTH2_REFRESH_TOKEN_GENERATOR = True
     UI_URL = 'http://0.0.0.0:5000'
     SENDER_EMAIL = 'fittrackee@example.com'
 
diff --git a/fittrackee/oauth2/client.py b/fittrackee/oauth2/client.py
index e07e6639..93094fe5 100644
--- a/fittrackee/oauth2/client.py
+++ b/fittrackee/oauth2/client.py
@@ -19,7 +19,7 @@ def create_oauth_client(metadata: Dict, user: User) -> OAuth2Client:
         'client_uri': metadata['client_uri'],
         'redirect_uris': metadata['redirect_uris'],
         'scope': metadata['scope'],
-        'grant_types': ['authorization_code'],
+        'grant_types': ['authorization_code', 'refresh_token'],
         'response_types': ['code'],
         'token_endpoint_auth_method': 'client_secret_post',
     }
diff --git a/fittrackee/oauth2/config.py b/fittrackee/oauth2/config.py
index 8f7bb4ea..0eb17145 100644
--- a/fittrackee/oauth2/config.py
+++ b/fittrackee/oauth2/config.py
@@ -1,7 +1,7 @@
 from authlib.oauth2.rfc7636 import CodeChallenge
 from flask import Flask
 
-from .grants import AuthorizationCodeGrant
+from .grants import AuthorizationCodeGrant, RefreshTokenGrant
 from .server import authorization_server
 
 
@@ -12,3 +12,4 @@ def config_oauth(app: Flask) -> None:
     authorization_server.register_grant(
         AuthorizationCodeGrant, [CodeChallenge(required=True)]
     )
+    authorization_server.register_grant(RefreshTokenGrant)
diff --git a/fittrackee/tests/oauth2/test_oauth2_client.py b/fittrackee/tests/oauth2/test_oauth2_client.py
index b8638f16..9628fb26 100644
--- a/fittrackee/tests/oauth2/test_oauth2_client.py
+++ b/fittrackee/tests/oauth2/test_oauth2_client.py
@@ -72,7 +72,10 @@ class TestCreateOAuth2Client:
     ) -> None:
         oauth_client = create_oauth_client(TEST_METADATA, user_1)
 
-        assert oauth_client.grant_types == ['authorization_code']
+        assert oauth_client.grant_types == [
+            'authorization_code',
+            'refresh_token',
+        ]
 
     def test_oauth_client_has_expected_redirect_uris(
         self, app: Flask, user_1: User
diff --git a/fittrackee/tests/oauth2/test_oauth2_routes.py b/fittrackee/tests/oauth2/test_oauth2_routes.py
index 5fdabf8a..05f36a7e 100644
--- a/fittrackee/tests/oauth2/test_oauth2_routes.py
+++ b/fittrackee/tests/oauth2/test_oauth2_routes.py
@@ -153,7 +153,7 @@ class TestOAuthClientCreation(OAuth2TestCase):
     @pytest.mark.parametrize(
         'input_key,expected_value',
         [
-            ('grant_types', ['authorization_code']),
+            ('grant_types', ['authorization_code', 'refresh_token']),
             ('response_types', ['code']),
             ('token_endpoint_auth_method', 'client_secret_post'),
         ],
@@ -271,6 +271,7 @@ class TestOAuthIssueToken(OAuth2TestCase):
         data = json.loads(response.data.decode())
         assert data.get('access_token') is not None
         assert data.get('expires_in') is not None
+        assert data.get('refresh_token') is not None
         assert data.get('token_type') == 'Bearer'
 
     @staticmethod