diff --git a/Pipfile.lock b/Pipfile.lock
index b3c0525..841035a 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -133,11 +133,10 @@
         },
         "flake8": {
             "hashes": [
-                "sha256:45681a117ecc81e870cbf1262835ae4af5e7a8b08e40b944a8a6e6b895914cfb",
-                "sha256:49356e766643ad15072a789a20915d3c91dc89fd313ccd71802303fd67e4deca"
+                "sha256:479b1304f72536a55948cb40a32dce8bb0ffe3501e26eaf292c7e60eb5e0428d",
+                "sha256:806e034dda44114815e23c16ef92f95c91e4c71100ff52813adf7132a6ad870d"
             ],
-            "index": "pypi",
-            "version": "==3.7.9"
+            "version": "==4.0.1"
         },
         "importlib-metadata": {
             "hashes": [
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 39f24f0..90350be 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-flake8==3.7.9
+flake8==4.0.1
 mccabe==0.6.1
 pycodestyle==2.5.0
 pyflakes==2.1.1