diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index aa654c2..93c3b53 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -19,8 +19,8 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', 'pypy3']
-        isort: [4.3.21, 5.9.3]
-        flake8: [3.9.2, 4.0.1]
+        isort: [4.3.21, 5.10.1]
+        flake8: [3.9.2, 4.0.1, 5.0.4]
 
     steps:
       - uses: actions/checkout@v2
diff --git a/setup.py b/setup.py
index 40110bc..b78d237 100644
--- a/setup.py
+++ b/setup.py
@@ -55,7 +55,7 @@ def get_version(file="flake8_isort.py"):
     include_package_data=True,
     zip_safe=False,
     install_requires=[
-        'flake8 >= 3.2.1, <5',
+        'flake8 >= 3.2.1, <6',
         'isort >= 4.3.5, <6',
     ],
     extras_require={