diff --git a/README.md b/README.md
index 28c7b58..8a956c0 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,20 @@ def hello_world(event, context):
 The configuration is done by passing arguments to the decorator.
 To view which arguments are supported, head over to this [documentation](https://serverless-api-framework-python.readthedocs.io/) page.
 
+### Local testing
+
+Before deploying, you can run your functions locally with the dev command:
+
+```console
+scw-serverless dev app.py
+```
+
+This runs a local Flask server with your Serverless handlers. If no `relative_url` is defined for a function, it will be served on `/name` with `name` being the name of your Python function.
+
+By default, this runs Flask in debug mode which includes hot-reloading. You can disable this behavior by passing the `--no-debug` flag.
+
+### Deploying
+
 When you are ready, you can deploy your function with the `scw-serverless` CLI tool:
 
 ```console
diff --git a/docs/source/deploying.rst b/docs/source/deploying.rst
index 8198dc6..f0783cc 100644
--- a/docs/source/deploying.rst
+++ b/docs/source/deploying.rst
@@ -1,7 +1,30 @@
 Deploying
 =========
 
-After writing your functions, the included CLI tool `scw-serverless` helps deploy your application on Scaleway.
+After writing your functions, the included CLI tool `scw-serverless` helps test and deploy your application on Scaleway.
+
+Running locally
+---------------
+
+You can test your functions locally before deploying with the `dev` command:
+
+.. code-block:: console
+
+    scw-serverless dev app.py
+
+This will start a local Flask server with your functions that will behave similarly to Scaleway Functions.
+
+By default, functions are served by `/name` on port 8080 with the name being the name of the Python function.
+
+You can then use your favorite tools to query the functions:
+
+.. code-block:: console
+
+    # For a function named def handle()...
+    curl http://localhost:8080/handle
+
+This command allows you to test your code, but as this test environment is not quite the same as Scaleway Functions,
+there might be slight differences when deploying.
 
 Deploy
 ------
diff --git a/examples/hello_world/handler.py b/examples/hello_world/handler.py
index 0a1ccb5..6e8bfe6 100644
--- a/examples/hello_world/handler.py
+++ b/examples/hello_world/handler.py
@@ -13,4 +13,4 @@ def handle(_event: dict[str, Any], _content: dict[str, Any]) -> dict[str, Any]:
         context (dict): function call metadata
     """
 
-    return {"message": "Hello from Scaleway functions using Serverless API Framework"}
+    return {"body": "Hello from Scaleway functions using Serverless API Framework"}
diff --git a/poetry.lock b/poetry.lock
index da60392..84531ec 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.4.2 and should not be changed by hand.
 
 [[package]]
 name = "alabaster"
@@ -44,20 +44,32 @@ files = [
     {file = "Babel-2.12.1.tar.gz", hash = "sha256:cc2d99999cd01d44420ae725a21c9e3711b3aadc7976d6147f622d8581963455"},
 ]
 
+[[package]]
+name = "blinker"
+version = "1.6.2"
+description = "Fast, simple object-to-object and broadcast signaling"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "blinker-1.6.2-py3-none-any.whl", hash = "sha256:c3d739772abb7bc2860abf5f2ec284223d9ad5c76da018234f6f50d6f31ab1f0"},
+    {file = "blinker-1.6.2.tar.gz", hash = "sha256:4afd3de66ef3a9f8067559fb7a1cbe555c17dcbe15971b05d1b625c3e7abe213"},
+]
+
 [[package]]
 name = "boto3"
-version = "1.26.130"
+version = "1.26.131"
 description = "The AWS SDK for Python"
 category = "dev"
 optional = false
 python-versions = ">= 3.7"
 files = [
-    {file = "boto3-1.26.130-py3-none-any.whl", hash = "sha256:d6f9c6ebf417260ea5fa7a227e7bce9451f1f5010be05ac4075596356f584455"},
-    {file = "boto3-1.26.130.tar.gz", hash = "sha256:3ae2b34921bb08a1d7ce52db9ec1a25159fca779648e596ede37e1049ed77de8"},
+    {file = "boto3-1.26.131-py3-none-any.whl", hash = "sha256:5b2b13d9f3430e3d5e768bf32097d5d6d16f47a4719f2656de67da49dd3e4de1"},
+    {file = "boto3-1.26.131.tar.gz", hash = "sha256:061d3270472b9be09901bb08a45e9871ac8f86a9b1c9c615535ca0223acd7582"},
 ]
 
 [package.dependencies]
-botocore = ">=1.29.130,<1.30.0"
+botocore = ">=1.29.131,<1.30.0"
 jmespath = ">=0.7.1,<2.0.0"
 s3transfer = ">=0.6.0,<0.7.0"
 
@@ -66,14 +78,14 @@ crt = ["botocore[crt] (>=1.21.0,<2.0a0)"]
 
 [[package]]
 name = "botocore"
-version = "1.29.130"
+version = "1.29.131"
 description = "Low-level, data-driven core of boto 3."
 category = "dev"
 optional = false
 python-versions = ">= 3.7"
 files = [
-    {file = "botocore-1.29.130-py3-none-any.whl", hash = "sha256:56d1f54c3f8e140f965e5300d1cc5b565cb758134d9213fb05e91e1bb160330e"},
-    {file = "botocore-1.29.130.tar.gz", hash = "sha256:3a31293b84ecfe5f5f2c4b7dc85a77d7b890b468a376b593fde15cacc76862dd"},
+    {file = "botocore-1.29.131-py3-none-any.whl", hash = "sha256:d0dea23bccdfd7c2f6d0cd3216cfbd7065bc3e9e7b1ef6fee0952b04f5d2cffd"},
+    {file = "botocore-1.29.131.tar.gz", hash = "sha256:ffbd85915b2624c545438a33c2624a809593720a10648f6e757fe50be4893188"},
 ]
 
 [package.dependencies]
@@ -86,14 +98,14 @@ crt = ["awscrt (==0.16.9)"]
 
 [[package]]
 name = "certifi"
-version = "2022.12.7"
+version = "2023.5.7"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
-    {file = "certifi-2022.12.7-py3-none-any.whl", hash = "sha256:4ad3232f5e926d6718ec31cfc1fcadfde020920e278684144551c91769c7bc18"},
-    {file = "certifi-2022.12.7.tar.gz", hash = "sha256:35824b4c3a97115964b408844d64aa14db1cc518f6562e8d7261699d1350a9e3"},
+    {file = "certifi-2023.5.7-py3-none-any.whl", hash = "sha256:c6c2e98f5c7869efca1f8916fed228dd91539f9f1b444c314c06eef02980c716"},
+    {file = "certifi-2023.5.7.tar.gz", hash = "sha256:0f0d56dc5a6ad56fd4ba36484d6cc34451e1c6548c61daad8c320169f91eddc7"},
 ]
 
 [[package]]
@@ -305,6 +317,30 @@ files = [
 docs = ["furo (>=2023.3.27)", "sphinx (>=6.1.3)", "sphinx-autodoc-typehints (>=1.23,!=1.23.4)"]
 testing = ["covdefaults (>=2.3)", "coverage (>=7.2.3)", "diff-cover (>=7.5)", "pytest (>=7.3.1)", "pytest-cov (>=4)", "pytest-mock (>=3.10)", "pytest-timeout (>=2.1)"]
 
+[[package]]
+name = "flask"
+version = "2.3.2"
+description = "A simple framework for building complex web applications."
+category = "main"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "Flask-2.3.2-py3-none-any.whl", hash = "sha256:77fd4e1249d8c9923de34907236b747ced06e5467ecac1a7bb7115ae0e9670b0"},
+    {file = "Flask-2.3.2.tar.gz", hash = "sha256:8c2f9abd47a9e8df7f0c3f091ce9497d011dc3b31effcf4c85a6e2b50f4114ef"},
+]
+
+[package.dependencies]
+blinker = ">=1.6.2"
+click = ">=8.1.3"
+importlib-metadata = {version = ">=3.6.0", markers = "python_version < \"3.10\""}
+itsdangerous = ">=2.1.2"
+Jinja2 = ">=3.1.2"
+Werkzeug = ">=2.3.3"
+
+[package.extras]
+async = ["asgiref (>=3.2)"]
+dotenv = ["python-dotenv"]
+
 [[package]]
 name = "identify"
 version = "2.5.24"
@@ -348,7 +384,7 @@ files = [
 name = "importlib-metadata"
 version = "6.6.0"
 description = "Read metadata from Python packages"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -394,11 +430,23 @@ pipfile-deprecated-finder = ["pip-shims (>=0.5.2)", "pipreqs", "requirementslib"
 plugins = ["setuptools"]
 requirements-deprecated-finder = ["pip-api", "pipreqs"]
 
+[[package]]
+name = "itsdangerous"
+version = "2.1.2"
+description = "Safely pass data to untrusted environments and back."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "itsdangerous-2.1.2-py3-none-any.whl", hash = "sha256:2c2349112351b88699d8d4b6b075022c0808887cb7ad10069318a8b0bc88db44"},
+    {file = "itsdangerous-2.1.2.tar.gz", hash = "sha256:5dbbc68b317e5e42f327f9021763545dc3fc3bfe22e6deb96aaf1fc38874156a"},
+]
+
 [[package]]
 name = "jinja2"
 version = "3.1.2"
 description = "A very fast and expressive template engine."
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -499,7 +547,7 @@ testing = ["coverage", "pytest", "pytest-cov", "pytest-regressions"]
 name = "markupsafe"
 version = "2.1.2"
 description = "Safely add untrusted strings to HTML/XML markup."
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -966,6 +1014,22 @@ python-dateutil = ">=2.8.2,<3.0.0"
 PyYAML = ">=6.0,<7.0"
 requests = ">=2.28.1,<3.0.0"
 
+[[package]]
+name = "scaleway-functions-python"
+version = "0.2.0"
+description = "Utilities for testing your Python handlers for Scaleway Serverless Functions."
+category = "main"
+optional = false
+python-versions = ">=3.8.1,<3.12"
+files = [
+    {file = "scaleway_functions_python-0.2.0-py3-none-any.whl", hash = "sha256:8c069cde434d0b981905f81fcf83404b1c715a475bbdac0005dfcdbd83005fc7"},
+    {file = "scaleway_functions_python-0.2.0.tar.gz", hash = "sha256:58248385fd6dabe34a61cfb014d6187f1c2e4c314e2b15275787b6b77c50d804"},
+]
+
+[package.dependencies]
+flask = ">=2.2.2,<3.0.0"
+typing-extensions = {version = ">=4.4.0,<5.0.0", markers = "python_version < \"3.11\""}
+
 [[package]]
 name = "setuptools"
 version = "67.7.2"
@@ -1259,6 +1323,24 @@ platformdirs = ">=3.2,<4"
 docs = ["furo (>=2023.3.27)", "proselint (>=0.13)", "sphinx (>=6.1.3)", "sphinx-argparse (>=0.4)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=22.12)"]
 test = ["covdefaults (>=2.3)", "coverage (>=7.2.3)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23.1)", "pytest (>=7.3.1)", "pytest-env (>=0.8.1)", "pytest-freezegun (>=0.4.2)", "pytest-mock (>=3.10)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)", "setuptools (>=67.7.1)", "time-machine (>=2.9)"]
 
+[[package]]
+name = "werkzeug"
+version = "2.3.4"
+description = "The comprehensive WSGI web application library."
+category = "main"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "Werkzeug-2.3.4-py3-none-any.whl", hash = "sha256:48e5e61472fee0ddee27ebad085614ebedb7af41e88f687aaf881afb723a162f"},
+    {file = "Werkzeug-2.3.4.tar.gz", hash = "sha256:1d5a58e0377d1fe39d061a5de4469e414e78ccb1e1e59c0f5ad6fa1c36c52b76"},
+]
+
+[package.dependencies]
+MarkupSafe = ">=2.1.1"
+
+[package.extras]
+watchdog = ["watchdog (>=2.3)"]
+
 [[package]]
 name = "wrapt"
 version = "1.15.0"
@@ -1348,7 +1430,7 @@ files = [
 name = "zipp"
 version = "3.15.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1362,5 +1444,5 @@ testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more
 
 [metadata]
 lock-version = "2.0"
-python-versions = "^3.9"
-content-hash = "53d7e9d97e1332183478de718f191bdc7c075ef709f05b6c382faaedbad0bc47"
+python-versions = ">=3.9,<3.12"
+content-hash = "ce9ca33d2e6393dde0b8addf5d7c6e3cfff0cddf98ae6ea2e5240b600e18fa68"
diff --git a/pyproject.toml b/pyproject.toml
index ea20b54..0372a53 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,9 +33,10 @@ include = ["CHANGELOG.md"]
 scw-serverless = "scw_serverless.cli:cli"
 
 [tool.poetry.dependencies]
-python = "^3.9"
+python = ">=3.9,<3.12"
 click = "^8.1.3"
 scaleway = ">=0.7,<0.13"
+scaleway-functions-python = "^0.2.0"
 requests = "^2.28.2"
 typing-extensions = { version = "^4.4.0", python = "<3.11" }
 
diff --git a/scw_serverless/cli.py b/scw_serverless/cli.py
index 9468283..9e5846c 100644
--- a/scw_serverless/cli.py
+++ b/scw_serverless/cli.py
@@ -5,7 +5,8 @@
 import click
 from scaleway import ScalewayException
 
-from scw_serverless import deployment, loader, logger
+import scw_serverless
+from scw_serverless import app, deployment, loader, local_app, logger
 from scw_serverless.dependencies_manager import DependenciesManager
 from scw_serverless.gateway.gateway_manager import GatewayManager
 
@@ -145,3 +146,30 @@ def deploy(
             sdk_client=client,
         )
         manager.update_routes()
+
+
+@cli.command()
+@CLICK_ARG_FILE
+@click.option(
+    "--port",
+    "-p",
+    "port",
+    default=8080,
+    show_default=True,
+    help="Set port to listen on.",
+)
+@click.option(
+    "--debug/--no-debug",
+    "debug",
+    default=True,
+    show_default=True,
+    help="Run Flask in debug mode.",
+)
+def dev(file: Path, port: int, debug: bool) -> None:
+    """Run functions locally with Serverless Local Testing."""
+    app.Serverless = local_app.ServerlessLocal
+    scw_serverless.Serverless = local_app.ServerlessLocal
+    app_instance = cast(
+        local_app.ServerlessLocal, loader.load_app_instance(file.resolve())
+    )
+    app_instance.local_server.serve(port=port, debug=debug)
diff --git a/scw_serverless/config/function.py b/scw_serverless/config/function.py
index 3e38574..08dd9fa 100644
--- a/scw_serverless/config/function.py
+++ b/scw_serverless/config/function.py
@@ -57,7 +57,7 @@ class Function:
     """Representation of a Scaleway function."""
 
     name: str
-    handler: str  # Path to the handler
+    handler_path: str
     environment_variables: Optional[dict[str, str]] = None
     min_scale: Optional[int] = None
     max_scale: Optional[int] = None
@@ -85,7 +85,7 @@ def from_handler(
             gateway_route = GatewayRoute(url, http_methods=args.get("http_methods"))
         return Function(
             name=to_valid_function_name(handler.__name__),
-            handler=module_to_path(handler.__module__) + "." + handler.__name__,
+            handler_path=module_to_path(handler.__module__) + "." + handler.__name__,
             environment_variables=args.get("env"),
             min_scale=args.get("min_scale"),
             max_scale=args.get("max_scale"),
diff --git a/scw_serverless/deployment/api_wrapper.py b/scw_serverless/deployment/api_wrapper.py
index 3a3cc97..4987b66 100644
--- a/scw_serverless/deployment/api_wrapper.py
+++ b/scw_serverless/deployment/api_wrapper.py
@@ -89,7 +89,7 @@ def create_function(
             max_scale=function.max_scale,
             memory_limit=function.memory_limit,
             timeout=function.timeout,
-            handler=function.handler,
+            handler=function.handler_path,
             description=function.description,
             secret_environment_variables=self._get_secrets_from_dict(
                 function.secret_environment_variables
@@ -110,7 +110,7 @@ def update_function(
             max_scale=function.max_scale,
             memory_limit=function.memory_limit,
             timeout=function.timeout,
-            handler=function.handler,
+            handler=function.handler_path,
             description=function.description,
             secret_environment_variables=self._get_secrets_from_dict(
                 function.secret_environment_variables
diff --git a/scw_serverless/local_app.py b/scw_serverless/local_app.py
new file mode 100644
index 0000000..ebaf767
--- /dev/null
+++ b/scw_serverless/local_app.py
@@ -0,0 +1,47 @@
+from typing import Any, Callable
+
+from scaleway_functions_python import local
+
+from scw_serverless.app import Serverless
+from scw_serverless.config.function import FunctionKwargs
+
+try:
+    from typing import Unpack
+except ImportError:
+    from typing_extensions import Unpack
+# pylint: disable=wrong-import-position # Conditional import considered a statement
+
+
+class ServerlessLocal(Serverless):
+    """Serverless class that is used when testing locally.
+
+    Crate a local testing framework server and inject the handlers to it.
+    """
+
+    def __init__(
+        self,
+        service_name: str,
+        env: dict[str, Any] | None = None,
+        secret: dict[str, Any] | None = None,
+    ):
+        super().__init__(service_name, env, secret)
+        self.local_server = local.LocalFunctionServer()
+
+    def func(
+        self,
+        **kwargs: "Unpack[FunctionKwargs]",
+    ) -> Callable:
+        decorator = super().func(**kwargs)
+
+        def _decorator(handler: Callable):
+            decorator(handler)
+            http_methods = None
+            if methods := kwargs.get("http_methods"):
+                http_methods = [method.value for method in methods]
+            self.local_server.add_handler(
+                handler=handler,
+                relative_url=kwargs.get("relative_url"),
+                http_methods=http_methods,
+            )
+
+        return _decorator
diff --git a/tests/integrations/utils.py b/tests/integrations/utils.py
index d7d3b06..329be20 100644
--- a/tests/integrations/utils.py
+++ b/tests/integrations/utils.py
@@ -76,7 +76,7 @@ def trigger_function(domain_name: str, max_retries: int = 10) -> requests.Respon
 
 
 def wait_for_body_text(
-    domain_name: str, body: str, max_retries: int = 10
+    domain_name: str, body: str, max_retries: int = 20
 ) -> requests.Response:
     last_body = None
     for _ in range(max_retries):
diff --git a/tests/test_deployment/test_deployment_manager.py b/tests/test_deployment/test_deployment_manager.py
index 8eb8246..74ac6d0 100644
--- a/tests/test_deployment/test_deployment_manager.py
+++ b/tests/test_deployment/test_deployment_manager.py
@@ -53,7 +53,7 @@ def get_test_backend() -> DeploymentManager:
 def test_scaleway_api_backend_deploy_function(mocked_responses: responses.RequestsMock):
     function = Function(
         name="test-function",
-        handler="handler",
+        handler_path="handler",
     )
     backend = get_test_backend()
     backend.app_instance.functions = [function]
@@ -137,7 +137,7 @@ def test_scaleway_api_backend_deploy_function_with_trigger(
     trigger = CronTrigger(schedule="* * * * * *", name="test-cron", args={"foo": "bar"})
     function = Function(
         name="test-function-with-trigger",
-        handler="handler",
+        handler_path="handler",
         triggers=[trigger],
     )
 
diff --git a/tests/test_gateway/test_gateway_manager.py b/tests/test_gateway/test_gateway_manager.py
index bc94539..81b813c 100644
--- a/tests/test_gateway/test_gateway_manager.py
+++ b/tests/test_gateway/test_gateway_manager.py
@@ -42,7 +42,7 @@ def test_gateway_manager_update_routes(
 ):
     function = Function(
         name="test-function",
-        handler="handler",
+        handler_path="handler",
         gateway_route=GatewayRoute(
             relative_url="/hello", http_methods=[HTTPMethod.GET]
         ),