diff --git a/Pipfile.lock b/Pipfile.lock
index b3c0525..25d61de 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -133,11 +133,10 @@
         },
         "flake8": {
             "hashes": [
-                "sha256:45681a117ecc81e870cbf1262835ae4af5e7a8b08e40b944a8a6e6b895914cfb",
-                "sha256:49356e766643ad15072a789a20915d3c91dc89fd313ccd71802303fd67e4deca"
+                "sha256:1aa8990be1e689d96c745c5682b687ea49f2e05a443aff1f8251092b0014e378",
+                "sha256:3b9f848952dddccf635be78098ca75010f073bfe14d2c6bda867154bea728d2a"
             ],
-            "index": "pypi",
-            "version": "==3.7.9"
+            "version": "==3.9.1"
         },
         "importlib-metadata": {
             "hashes": [
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 39f24f0..75af117 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-flake8==3.7.9
+flake8==3.9.1
 mccabe==0.6.1
 pycodestyle==2.5.0
 pyflakes==2.1.1