diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 57381d3..4f031ee 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -9,7 +9,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Build and publish to pypi
-        uses: JRubics/poetry-publish@v1.15
+        uses: JRubics/poetry-publish@v1.16
         with:
           pypi_token: ${{ secrets.PYPI_TOKEN }}
           python_version: "3.10"
diff --git a/.github/workflows/update-reference-values.yml b/.github/workflows/update-reference-values.yml
new file mode 100644
index 0000000..562ddc5
--- /dev/null
+++ b/.github/workflows/update-reference-values.yml
@@ -0,0 +1,33 @@
+name: Update reference values
+on:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  generate-openapi:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.11"
+      - name: Install dependencies
+        run: |
+          python -m pip install poetry
+          poetry install
+      - name: "♻️ Get last values from reference repository"
+        run: |
+          poetry run update-values
+          poetry run black ./ecoindex/data
+      - name: Update PR with new openapi version
+        uses: gr2m/create-or-update-pull-request-action@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          title: "⬆️ chore(values): Update reference values"
+          branch: "chore/ecoindex-reference-values"
+          path: "ecoindex/data/"
+          commit-message: "⬆️ chore(values): Update reference values"
+          auto-merge: squash
+          body: "Update reference values from repository [cnumr/ecoindex_reference](https://www.github.com/cnumr/ecoindex_reference)"
diff --git a/ecoindex/__init__.py b/ecoindex/__init__.py
index 51eeed7..4a0590b 100644
--- a/ecoindex/__init__.py
+++ b/ecoindex/__init__.py
@@ -1 +1,5 @@
+from .data.grades import A, B, C, D, E, F, G
+from .data.medians import median_dom, median_req, median_size
+from .data.targets import target_dom, target_req, target_size
 from .ecoindex import get_ecoindex
+from .utils import update_values
diff --git a/ecoindex/data/grades.py b/ecoindex/data/grades.py
new file mode 100644
index 0000000..2f132d9
--- /dev/null
+++ b/ecoindex/data/grades.py
@@ -0,0 +1,7 @@
+A = 80
+B = 70
+C = 55
+D = 40
+E = 25
+F = 10
+G = 0
diff --git a/ecoindex/data/medians.py b/ecoindex/data/medians.py
new file mode 100644
index 0000000..9e2b71e
--- /dev/null
+++ b/ecoindex/data/medians.py
@@ -0,0 +1,3 @@
+median_dom = 693
+median_req = 78
+median_size = 2420
diff --git a/ecoindex/quantiles.py b/ecoindex/data/quantiles.py
similarity index 100%
rename from ecoindex/quantiles.py
rename to ecoindex/data/quantiles.py
diff --git a/ecoindex/data/targets.py b/ecoindex/data/targets.py
new file mode 100644
index 0000000..609b652
--- /dev/null
+++ b/ecoindex/data/targets.py
@@ -0,0 +1,3 @@
+target_dom = 600
+target_req = 40
+target_size = 1024
diff --git a/ecoindex/ecoindex.py b/ecoindex/ecoindex.py
index 0f8ff27..f95b499 100644
--- a/ecoindex/ecoindex.py
+++ b/ecoindex/ecoindex.py
@@ -1,12 +1,11 @@
-from typing import List, Union
+from typing import List
 
+from ecoindex.data.grades import A, B, C, D, E, F, G
+from ecoindex.data.quantiles import quantiles_dom, quantiles_req, quantiles_size
 from ecoindex.models import Ecoindex
-from ecoindex.quantiles import quantiles_dom, quantiles_req, quantiles_size
 
 
-async def get_quantile(
-    quantiles: List[Union[int, float]], value: Union[int, float]
-) -> float:
+async def get_quantile(quantiles: List[int | float], value: int | float) -> float:
     for i in range(1, len(quantiles)):
         if value < quantiles[i]:
             return (
@@ -36,18 +35,10 @@ async def get_ecoindex(dom: int, size: float, requests: int) -> Ecoindex:
 
 
 async def get_grade(ecoindex: float) -> str:
-    if ecoindex > 80:
-        return "A"
-    if ecoindex > 70:
-        return "B"
-    if ecoindex > 55:
-        return "C"
-    if ecoindex > 40:
-        return "D"
-    if ecoindex > 25:
-        return "E"
-    if ecoindex > 10:
-        return "F"
+    for grade in "ABCDEF":
+        if ecoindex > globals()[grade]:
+            return grade
+
     return "G"
 
 
diff --git a/ecoindex/models.py b/ecoindex/models.py
index 4022f4a..ca0337b 100644
--- a/ecoindex/models.py
+++ b/ecoindex/models.py
@@ -4,7 +4,6 @@
 
 from pkg_resources import get_distribution
 from pydantic import AnyHttpUrl, BaseModel, Field
-from pydantic.networks import HttpUrl
 
 PageType = str
 
diff --git a/ecoindex/utils.py b/ecoindex/utils.py
new file mode 100644
index 0000000..eea5404
--- /dev/null
+++ b/ecoindex/utils.py
@@ -0,0 +1,50 @@
+from asyncio import run
+from json import dumps
+from os import getcwd
+
+from aiofile import async_open
+from requests import get
+
+
+async def update_values_async() -> None:
+    response = get(
+        "https://cdn.jsdelivr.net/gh/cnumr/ecoindex_reference@1/ecoindex_reference.json",
+    )
+
+    data = response.json()
+    data_folder = f"{getcwd()}/ecoindex/data/"
+
+    async with async_open(f"{data_folder}quantiles.py", "w") as quantile_file:
+        quantiles = f"quantiles_dom = {dumps(data['quantiles']['dom_size'])}\n"
+        quantiles += f"quantiles_req = {dumps(data['quantiles']['nb_request'])}\n"
+        quantiles += f"quantiles_size = {dumps(data['quantiles']['response_size'])}\n"
+
+        await quantile_file.write(quantiles)
+
+    async with async_open(f"{data_folder}targets.py", "w") as target_file:
+        targets = f"target_dom = {dumps(data['targets']['dom_size'])}\n"
+        targets += f"target_req = {dumps(data['targets']['nb_request'])}\n"
+        targets += f"target_size = {dumps(data['targets']['response_size'])}\n"
+
+        await target_file.write(targets)
+
+    async with async_open(f"{data_folder}medians.py", "w") as median_file:
+        medians = f"median_dom = {dumps(data['medians']['dom_size'])}\n"
+        medians += f"median_req = {dumps(data['medians']['nb_request'])}\n"
+        medians += f"median_size = {dumps(data['medians']['response_size'])}\n"
+
+        await median_file.write(medians)
+
+    async with async_open(f"{data_folder}grades.py", "w") as grades_file:
+        grades = ""
+
+        for grade in data["grades"]:
+            grades += f"{grade['grade']} = {grade['value']}\n"
+
+        await grades_file.write(grades)
+
+    print("Values updated")
+
+
+def update_values() -> None:
+    run(update_values_async())
diff --git a/poetry.lock b/poetry.lock
index e96c776..3438f11 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,3 +1,17 @@
+[[package]]
+name = "aiofile"
+version = "3.8.5"
+description = "Asynchronous file operations."
+category = "main"
+optional = false
+python-versions = ">=3.7, <4"
+
+[package.dependencies]
+caio = ">=0.9.0,<0.10.0"
+
+[package.extras]
+develop = ["aiomisc-pytest", "coveralls", "pytest", "pytest-cov", "pytest-rst"]
+
 [[package]]
 name = "attrs"
 version = "22.2.0"
@@ -15,7 +29,7 @@ tests-no-zope = ["cloudpickle", "cloudpickle", "hypothesis", "hypothesis", "mypy
 
 [[package]]
 name = "black"
-version = "22.12.0"
+version = "23.1.0"
 description = "The uncompromising code formatter."
 category = "dev"
 optional = false
@@ -24,9 +38,10 @@ python-versions = ">=3.7"
 [package.dependencies]
 click = ">=8.0.0"
 mypy-extensions = ">=0.4.3"
+packaging = ">=22.0"
 pathspec = ">=0.9.0"
 platformdirs = ">=2"
-tomli = {version = ">=1.1.0", markers = "python_full_version < \"3.11.0a7\""}
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
 
 [package.extras]
 colorama = ["colorama (>=0.4.3)"]
@@ -34,6 +49,33 @@ d = ["aiohttp (>=3.7.4)"]
 jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
 uvloop = ["uvloop (>=0.15.2)"]
 
+[[package]]
+name = "caio"
+version = "0.9.12"
+description = "Asynchronous file IO for Linux MacOS or Windows."
+category = "main"
+optional = false
+python-versions = ">=3.7, <4"
+
+[package.extras]
+develop = ["aiomisc-pytest", "pytest", "pytest-cov"]
+
+[[package]]
+name = "certifi"
+version = "2022.12.7"
+description = "Python package for providing Mozilla's CA Bundle."
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "charset-normalizer"
+version = "3.1.0"
+description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
+category = "main"
+optional = false
+python-versions = ">=3.7.0"
+
 [[package]]
 name = "click"
 version = "8.1.3"
@@ -64,6 +106,14 @@ python-versions = ">=3.7"
 [package.extras]
 test = ["pytest (>=6)"]
 
+[[package]]
+name = "idna"
+version = "3.4"
+description = "Internationalized Domain Names in Applications (IDNA)"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
 [[package]]
 name = "iniconfig"
 version = "2.0.0"
@@ -170,6 +220,24 @@ pytest = ">=7.0.0"
 docs = ["sphinx (>=5.3)", "sphinx-rtd-theme (>=1.0)"]
 testing = ["coverage (>=6.2)", "flaky (>=3.5.0)", "hypothesis (>=5.7.1)", "mypy (>=0.931)", "pytest-trio (>=0.7.0)"]
 
+[[package]]
+name = "requests"
+version = "2.28.2"
+description = "Python HTTP for Humans."
+category = "main"
+optional = false
+python-versions = ">=3.7, <4"
+
+[package.dependencies]
+certifi = ">=2017.4.17"
+charset-normalizer = ">=2,<4"
+idna = ">=2.5,<4"
+urllib3 = ">=1.21.1,<1.27"
+
+[package.extras]
+socks = ["PySocks (>=1.5.6,!=1.5.7)"]
+use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
+
 [[package]]
 name = "tomli"
 version = "2.0.1"
@@ -186,29 +254,163 @@ category = "main"
 optional = false
 python-versions = ">=3.7"
 
+[[package]]
+name = "urllib3"
+version = "1.26.15"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
+
+[package.extras]
+brotli = ["brotli (>=1.0.9)", "brotlicffi (>=0.8.0)", "brotlipy (>=0.6.0)"]
+secure = ["certifi", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "ipaddress", "pyOpenSSL (>=0.14)", "urllib3-secure-extra"]
+socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
+
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.10"
-content-hash = "22ff3b086226c99ede4a6e7c780cfcde12d1e5e82865f4768708955c8a0682e5"
+content-hash = "0e1d558142fac02f3d75fa6c6c8f405846707ac94aca51f2febf1ee061772f24"
 
 [metadata.files]
+aiofile = [
+    {file = "aiofile-3.8.5-py3-none-any.whl", hash = "sha256:6644b61ab143a8e516920cdb02d5b46f89c0a37ef036417720f653b5ed31a8c9"},
+    {file = "aiofile-3.8.5.tar.gz", hash = "sha256:bb1ca0b2c4ef3b78f5012a2a3919a4151f873b6aabdc73a7b9b8e94edb2e01ae"},
+]
 attrs = [
     {file = "attrs-22.2.0-py3-none-any.whl", hash = "sha256:29e95c7f6778868dbd49170f98f8818f78f3dc5e0e37c0b1f474e3561b240836"},
     {file = "attrs-22.2.0.tar.gz", hash = "sha256:c9227bfc2f01993c03f68db37d1d15c9690188323c067c641f1a35ca58185f99"},
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 black = [
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+    {file = "charset_normalizer-3.1.0-cp39-cp39-musllinux_1_1_ppc64le.whl", hash = "sha256:6f4f4668e1831850ebcc2fd0b1cd11721947b6dc7c00bf1c6bd3c929ae14f2c7"},
+    {file = "charset_normalizer-3.1.0-cp39-cp39-musllinux_1_1_s390x.whl", hash = "sha256:0be65ccf618c1e7ac9b849c315cc2e8a8751d9cfdaa43027d4f6624bd587ab7e"},
+    {file = "charset_normalizer-3.1.0-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:53d0a3fa5f8af98a1e261de6a3943ca631c526635eb5817a87a59d9a57ebf48f"},
+    {file = "charset_normalizer-3.1.0-cp39-cp39-win32.whl", hash = "sha256:a04f86f41a8916fe45ac5024ec477f41f886b3c435da2d4e3d2709b22ab02af1"},
+    {file = "charset_normalizer-3.1.0-cp39-cp39-win_amd64.whl", hash = "sha256:830d2948a5ec37c386d3170c483063798d7879037492540f10a475e3fd6f244b"},
+    {file = "charset_normalizer-3.1.0-py3-none-any.whl", hash = "sha256:3d9098b479e78c85080c98e1e35ff40b4a31d8953102bb0fd7d1b6f8a2111a3d"},
 ]
 click = [
     {file = "click-8.1.3-py3-none-any.whl", hash = "sha256:bb4d8133cb15a609f44e8213d9b391b0809795062913b383c62be0ee95b1db48"},
@@ -222,6 +424,10 @@ exceptiongroup = [
     {file = "exceptiongroup-1.1.1-py3-none-any.whl", hash = "sha256:232c37c63e4f682982c8b6459f33a8981039e5fb8756b2074364e5055c498c9e"},
     {file = "exceptiongroup-1.1.1.tar.gz", hash = "sha256:d484c3090ba2889ae2928419117447a14daf3c1231d5e30d0aae34f354f01785"},
 ]
+idna = [
+    {file = "idna-3.4-py3-none-any.whl", hash = "sha256:90b77e79eaa3eba6de819a0c442c0b4ceefc341a7a2ab77d7562bf49f425c5c2"},
+    {file = "idna-3.4.tar.gz", hash = "sha256:814f528e8dead7d329833b91c5faa87d60bf71824cd12a7530b5526063d02cb4"},
+]
 iniconfig = [
     {file = "iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"},
     {file = "iniconfig-2.0.0.tar.gz", hash = "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3"},
@@ -292,6 +498,10 @@ pytest-asyncio = [
     {file = "pytest-asyncio-0.21.0.tar.gz", hash = "sha256:2b38a496aef56f56b0e87557ec313e11e1ab9276fc3863f6a7be0f1d0e415e1b"},
     {file = "pytest_asyncio-0.21.0-py3-none-any.whl", hash = "sha256:f2b3366b7cd501a4056858bd39349d5af19742aed2d81660b7998b6341c7eb9c"},
 ]
+requests = [
+    {file = "requests-2.28.2-py3-none-any.whl", hash = "sha256:64299f4909223da747622c030b781c0d7811e359c37124b4bd368fb8c6518baa"},
+    {file = "requests-2.28.2.tar.gz", hash = "sha256:98b1b2782e3c6c4904938b84c0eb932721069dfdb9134313beff7c83c2df24bf"},
+]
 tomli = [
     {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
     {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
@@ -300,3 +510,7 @@ typing-extensions = [
     {file = "typing_extensions-4.5.0-py3-none-any.whl", hash = "sha256:fb33085c39dd998ac16d1431ebc293a8b3eedd00fd4a32de0ff79002c19511b4"},
     {file = "typing_extensions-4.5.0.tar.gz", hash = "sha256:5cb5f4a79139d699607b3ef622a1dedafa84e115ab0024e0d9c044a9479ca7cb"},
 ]
+urllib3 = [
+    {file = "urllib3-1.26.15-py2.py3-none-any.whl", hash = "sha256:aa751d169e23c7479ce47a0cb0da579e3ede798f994f5816a74e4f4500dcea42"},
+    {file = "urllib3-1.26.15.tar.gz", hash = "sha256:8a388717b9476f934a21484e8c8e61875ab60644d29b9b39e11e4b9dc1c6b305"},
+]
diff --git a/pyproject.toml b/pyproject.toml
index d5b9bc1..397c563 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,12 +14,17 @@ include = [
 [tool.poetry.dependencies]
 python = "^3.10"
 pydantic = "^1.10.2"
+requests = "^2.28.2"
+aiofile = "^3.8.1"
 
 [tool.poetry.dev-dependencies]
 pytest = "^7.2"
-black = "^22.12"
+black = "^23.1"
 pytest-asyncio = "^0.21.0"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"
+
+[tool.poetry.scripts]
+update-values = "ecoindex:utils.update_values"
\ No newline at end of file
diff --git a/tests/test_ecoindex.py b/tests/test_ecoindex.py
index 57902b4..f9ee135 100644
--- a/tests/test_ecoindex.py
+++ b/tests/test_ecoindex.py
@@ -1,5 +1,6 @@
 import pytest
 
+from ecoindex.data.quantiles import quantiles_dom, quantiles_req, quantiles_size
 from ecoindex.ecoindex import (
     get_ecoindex,
     get_grade,
@@ -9,7 +10,6 @@
     get_water_consumption,
 )
 from ecoindex.models import Ecoindex
-from ecoindex.quantiles import quantiles_dom, quantiles_req, quantiles_size
 
 
 @pytest.mark.asyncio