diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 271642c..454da04 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -14,7 +14,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: "3.10"
+        python-version: "3.11"
     - name: Build wheel and source tarball
       run: |
         pip install wheel
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 454ab1b..0f7453c 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -11,7 +11,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: "3.10"
+        python-version: "3.11"
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7e58bb5..ceecb95 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,11 +8,9 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
         os: [ubuntu-latest, windows-latest]
         exclude:
-          - os: windows-latest
-            python-version: "3.7"
           - os: windows-latest
             python-version: "3.8"
           - os: windows-latest
@@ -32,8 +30,6 @@ jobs:
           pip install tox tox-gh-actions
       - name: Test with tox
         run: tox
-        env:
-          TOXENV: ${{ matrix.toxenv }}
 
   coverage:
     runs-on: ubuntu-latest
@@ -43,7 +39,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - name: Install test dependencies
         run: |
           python -m pip install --upgrade pip
diff --git a/graphql_server/sanic/graphqlview.py b/graphql_server/sanic/graphqlview.py
index e8af82d..50e9922 100644
--- a/graphql_server/sanic/graphqlview.py
+++ b/graphql_server/sanic/graphqlview.py
@@ -1,6 +1,5 @@
 import asyncio
 import copy
-from cgi import parse_header
 from collections.abc import MutableMapping
 from functools import partial
 from typing import List
@@ -8,6 +7,7 @@
 from graphql import GraphQLError, specified_rules
 from graphql.pyutils import is_awaitable
 from graphql.type.schema import GraphQLSchema
+from sanic.headers import parse_content_header
 from sanic.response import HTTPResponse, html
 from sanic.views import HTTPMethodView
 
@@ -213,7 +213,7 @@ def get_mime_type(request):
         if "content-type" not in request.headers:
             return None
 
-        mime_type, _ = parse_header(request.headers["content-type"])
+        mime_type, _ = parse_content_header(request.headers["content-type"])
         return mime_type
 
     def should_display_graphiql(self, request):
diff --git a/setup.py b/setup.py
index bf3f24f..ee568ab 100644
--- a/setup.py
+++ b/setup.py
@@ -12,23 +12,23 @@
     "pytest-asyncio>=0.20,<1",
     "pytest-cov>=4,<5",
     "Jinja2>=3.1,<4",
-    "sanic-testing>=22.3,<23",
+    "sanic-testing>=22.3,<24",
 ]
 
 dev_requires = [
-    "flake8>=5,<6",
+    "flake8>=6,<7",
     "isort>=5,<6",
-    "black>=22.12,<22.13",
-    "mypy>=0.991,<1",
+    "black>=23.9,<23.10",
+    "mypy>=1.6,<1.7",
     "check-manifest>=0.47,<1",
 ] + tests_requires
 
 install_flask_requires = [
-    "flask>=1,<3",
+    "flask>=1,<4",
 ]
 
 install_sanic_requires = [
-    "sanic>=21.12,<23",
+    "sanic>=21.12,<24",
 ]
 
 install_webob_requires = [
@@ -71,11 +71,10 @@
         "Development Status :: 3 - Alpha",
         "Intended Audience :: Developers",
         "Topic :: Software Development :: Libraries",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
         "License :: OSI Approved :: MIT License",
     ],
     keywords="api graphql protocol rest",
diff --git a/tests/flask/test_graphqlview.py b/tests/flask/test_graphqlview.py
index a222381..34ddcb9 100644
--- a/tests/flask/test_graphqlview.py
+++ b/tests/flask/test_graphqlview.py
@@ -1,5 +1,4 @@
 import json
-from io import StringIO
 from urllib.parse import urlencode
 
 import pytest
@@ -518,10 +517,24 @@ def test_allow_empty_custom_context(app, client):
 
 def test_post_multipart_data(app, client):
     query = "mutation TestMutation { writeTest { test } }"
+
+    data = (
+        "------flaskgraphql\r\n"
+        'Content-Disposition: form-data; name="query"\r\n'
+        "\r\n" + query + "\r\n"
+        "------flaskgraphql--\r\n"
+        "Content-Type: text/plain; charset=utf-8\r\n"
+        'Content-Disposition: form-data; name="file"; filename="text1.txt";'
+        " filename*=utf-8''text1.txt\r\n"
+        "\r\n"
+        "\r\n"
+        "------flaskgraphql--\r\n"
+    )
+
     response = client.post(
         url_string(app),
-        data={"query": query, "file": (StringIO(), "text1.txt")},
-        content_type="multipart/form-data",
+        data=data,
+        content_type="multipart/form-data; boundary=----flaskgraphql",
     )
 
     assert response.status_code == 200
diff --git a/tox.ini b/tox.ini
index 1c534fd..6627604 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,12 +1,11 @@
 [tox]
 envlist =
     black,flake8,import-order,mypy,manifest,
-    py{37,38,39,310,311}
+    py{38,39,310,311}
 ; requires = tox-conda
 
 [gh-actions]
 python =
-    3.7: py37
     3.8: py38
     3.9: py39
     3.10: py310
@@ -23,35 +22,35 @@ whitelist_externals =
     python
 commands =
     pip install -U setuptools
-    py{37,38,39,311}: pytest tests {posargs}
-    py{310}: pytest tests --cov-report=term-missing --cov=graphql_server {posargs}
+    py{38,39,310}: pytest tests {posargs}
+    py{311}: pytest tests --cov-report=term-missing --cov=graphql_server {posargs}
 
 [testenv:black]
-basepython = python3.10
+basepython = python3.11
 deps = -e.[dev]
 commands =
     black --check graphql_server tests
 
 [testenv:flake8]
-basepython = python3.10
+basepython = python3.11
 deps = -e.[dev]
 commands =
     flake8 setup.py graphql_server tests
 
 [testenv:import-order]
-basepython = python3.10
+basepython = python3.11
 deps = -e.[dev]
 commands =
     isort graphql_server/ tests/
 
 [testenv:mypy]
-basepython = python3.10
+basepython = python3.11
 deps = -e.[dev]
 commands =
     mypy graphql_server tests --ignore-missing-imports
 
 [testenv:manifest]
-basepython = python3.10
+basepython = python3.11
 deps = -e.[dev]
 commands =
     check-manifest -v