diff --git a/Pipfile b/Pipfile
index 3c755e7..3c5289e 100644
--- a/Pipfile
+++ b/Pipfile
@@ -21,7 +21,7 @@ pymysql = "==1.1.1"
 werkzeug = "==2.3.8"
 
 [dev-packages]
-flake8 = "==3.9.2"
+flake8 = "==6.1.0"
 yapf = "==0.40.2"
 pre-commit = "==2.13.0"
 reuse = "==0.14.0"
diff --git a/Pipfile.lock b/Pipfile.lock
index 2e00921..8ada4e1 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "a647d74bf13c528f538d3b81c79aeb2807516e4c6668c687b4a70613f266cc8d"
+            "sha256": "188212cc5572d4e8ecb03e82537b5032c03fe50ec641051ebe648c595eda4f77"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -586,12 +586,12 @@
         },
         "flake8": {
             "hashes": [
-                "sha256:07528381786f2a6237b061f6e96610a4167b226cb926e2aa2b6b1d78057c576b",
-                "sha256:bf8fd333346d844f616e8d47905ef3a3384edae6b4e9beb0c5101e25e3110907"
+                "sha256:d5b3857f07c030bdb5bf41c7f53799571d75c4491748a3adcd47de929e34cd23",
+                "sha256:ffdfce58ea94c6580c77888a86506937f9a1a227dfcd15f245d694ae20a6b6e5"
             ],
             "index": "pypi",
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
-            "version": "==3.9.2"
+            "markers": "python_full_version >= '3.8.1'",
+            "version": "==6.1.0"
         },
         "identify": {
             "hashes": [
@@ -701,10 +701,11 @@
         },
         "mccabe": {
             "hashes": [
-                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
-                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
+                "sha256:348e0240c33b60bbdf4e523192ef919f28cb2c3d7d5c7794f74009290f236325",
+                "sha256:6c2d30ab6be0e4a46919781807b4f0d834ebdd6c6e3dca0bda5a15f863427b6e"
             ],
-            "version": "==0.6.1"
+            "markers": "python_version >= '3.6'",
+            "version": "==0.7.0"
         },
         "nodeenv": {
             "hashes": [
@@ -733,19 +734,19 @@
         },
         "pycodestyle": {
             "hashes": [
-                "sha256:514f76d918fcc0b55c6680472f0a37970994e07bbb80725808c17089be302068",
-                "sha256:c389c1d06bf7904078ca03399a4816f974a1d590090fecea0c63ec26ebaf1cef"
+                "sha256:41ba0e7afc9752dfb53ced5489e89f8186be00e599e712660695b7a75ff2663f",
+                "sha256:44fe31000b2d866f2e41841b18528a505fbd7fef9017b04eff4e2648a0fadc67"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==2.7.0"
+            "markers": "python_version >= '3.8'",
+            "version": "==2.11.1"
         },
         "pyflakes": {
             "hashes": [
-                "sha256:7893783d01b8a89811dd72d7dfd4d84ff098e5eed95cfa8905b22bbffe52efc3",
-                "sha256:f5bc8ecabc05bb9d291eb5203d6810b49040f6ff446a756326104746cc00c1db"
+                "sha256:4132f6d49cb4dae6819e5379898f2b8cce3c5f23994194c24b77d5da2e36f774",
+                "sha256:a0aae034c444db0071aa077972ba4768d40c830d9539fd45bf4cd3f8f6992efc"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==2.3.1"
+            "markers": "python_version >= '3.8'",
+            "version": "==3.1.0"
         },
         "python-debian": {
             "hashes": [