diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index a204852..39802c8 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,23 +8,19 @@ on:
 
 jobs:
   test:
-    runs-on: ${{ matrix.os || 'ubuntu-latest' }}
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         include:
-          - python: "3.6"
-            env: py36-django21
-            os: ubuntu-20.04  # 3.6 is not available on ubuntu-20.04
           - python: "3.8"
             env: py38-django21
           - python: "3.9"
             env: py39-django21
 
-          - python: "3.6"
-            env: py36-django32
-            os: ubuntu-20.04  # 3.6 is not available on ubuntu-20.04
           - python: "3.8"
             env: py38-django32
+          - python: "3.9"
+            env: py39-django32
           - python: "3.10"
             env: py310-django32
 
@@ -49,6 +45,20 @@ jobs:
           - python: "3.11"
             env: py311-django42
 
+          - python: "3.10"
+            env: py310-django51
+          - python: "3.11"
+            env: py311-django51
+          - python: "3.12"
+            env: py312-django51
+
+          - python: "3.10"
+            env: py310-django52
+          - python: "3.11"
+            env: py311-django52
+          - python: "3.12"
+            env: py312-django52
+
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python }}
diff --git a/build.sh b/build.sh
index b7ad47e..d2c24ae 100644
--- a/build.sh
+++ b/build.sh
@@ -4,5 +4,4 @@
 pip install build==0.9.0
 
 # build the wheel and install it
-WHEEL_NAME=$(python -m build | grep -Po "django_forbid-.*\.whl" | tail -n 1)
-pip install dist/$WHEEL_NAME
\ No newline at end of file
+python -m build && pip install $(ls dist/django_forbid-*.whl)
\ No newline at end of file
diff --git a/setup.cfg b/setup.cfg
index 6250003..84348e6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -38,13 +38,16 @@ classifiers =
     Framework :: Django :: 3.2
     Framework :: Django :: 4.1
     Framework :: Django :: 4.2
+    Framework :: Django :: 5.1
+    Framework :: Django :: 5.2
     Programming Language :: Python
     Programming Language :: Python :: 3
-    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
+    Programming Language :: Python :: 3.12
     License :: OSI Approved :: MIT License
 
 [options]
@@ -56,7 +59,7 @@ install_requires =
     geoip2
     device_detector
 include_package_data = yes
-python_requires = >=3.6
+python_requires = >=3.7
 package_dir =
     =src
 zip_safe = no
diff --git a/src/django_forbid/middleware.py b/src/django_forbid/middleware.py
index 5946874..f9134b8 100644
--- a/src/django_forbid/middleware.py
+++ b/src/django_forbid/middleware.py
@@ -20,7 +20,8 @@ def __init__(self, get_response):
 
     def __call__(self, request):
         get_response = self.get_response
-        if self.regex.search(request.META.get("HTTP_ACCEPT")):
+        http_accept = request.META.get("HTTP_ACCEPT")
+        if isinstance(http_accept, (bytes, str)) and self.regex.search(http_accept):
             for skill in __skills__:
                 get_response = skill(get_response)
         return get_response(request)
diff --git a/tox.ini b/tox.ini
index 05daa81..b9b096f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,14 +1,15 @@
 [tox]
 envlist =
-    py{36,38,39}-django21
-    py{36,38,310}-django32
+    py{37,38,39}-django21
+    py{38,39,310}-django32
     py{38,39,310}-django40
     py{39,310,311}-django{41,42}
-    py{310,311}-djangomain
+    py{310,311,312}-django{51,52}
 
 [testenv]
 deps =
-    djangomain: https://github.com/django/django/tarball/main
+    django52: django>=5.2
+    django51: django<5.2
     django42: django<4.3
     django41: django<4.2
     django40: django<4.1