diff --git a/package.json b/package.json
index 11fd11c..5c52e16 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "@ava/typescript": "^1.1.1",
     "@types/node": "^15.0.0",
-    "@typescript-eslint/eslint-plugin": "^2.22.0",
+    "@typescript-eslint/eslint-plugin": "^4.29.0",
     "@typescript-eslint/parser": "^4.15.2",
     "ava": "^3.5.0",
     "eslint": "^6.8.0",
diff --git a/yarn.lock b/yarn.lock
index 90aaf83..8e75e8d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -202,10 +202,10 @@
   resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
   integrity sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==
 
-"@types/json-schema@^7.0.3":
-  version "7.0.3"
-  resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.3.tgz#bdfd69d61e464dcc81b25159c270d75a73c1a636"
-  integrity sha512-Il2DtDVRGDcqjDtE+rF8iqg1CArehSK84HZJCT7AMITlyXRBpuPhqGLDQMowraqqu1coEaimg4ZOqggt6L6L+A==
+"@types/json-schema@^7.0.7":
+  version "7.0.8"
+  resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.8.tgz#edf1bf1dbf4e04413ca8e5b17b3b7d7d54b59818"
+  integrity sha512-YSBPTLTVm2e2OoQIDYx8HaeWJ5tTToLH67kXR7zYNGupXMEHa2++G8k+DczX2cFVgalypqtyZIcU19AFcmOpmg==
 
 "@types/node@^15.0.0":
   version "15.0.2"
@@ -217,25 +217,30 @@
   resolved "https://registry.yarnpkg.com/@types/normalize-package-data/-/normalize-package-data-2.4.0.tgz#e486d0d97396d79beedd0a6e33f4534ff6b4973e"
   integrity sha512-f5j5b/Gf71L+dbqxIpQ4Z2WlmI/mPJ0fOkGGmFgtb6sAu97EPczzbS3/tJKxmcYDj55OX6ssqwDAWOHIYDRDGA==
 
-"@typescript-eslint/eslint-plugin@^2.22.0":
-  version "2.34.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.34.0.tgz#6f8ce8a46c7dea4a6f1d171d2bb8fbae6dac2be9"
-  integrity sha512-4zY3Z88rEE99+CNvTbXSyovv2z9PNOVffTWD2W8QF5s2prBQtwN2zadqERcrHpcR7O/+KMI3fcTAmUUhK/iQcQ==
+"@typescript-eslint/eslint-plugin@^4.29.0":
+  version "4.29.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.29.0.tgz#b866c9cd193bfaba5e89bade0015629ebeb27996"
+  integrity sha512-eiREtqWRZ8aVJcNru7cT/AMVnYd9a2UHsfZT8MR1dW3UUEg6jDv9EQ9Cq4CUPZesyQ58YUpoAADGv71jY8RwgA==
   dependencies:
-    "@typescript-eslint/experimental-utils" "2.34.0"
+    "@typescript-eslint/experimental-utils" "4.29.0"
+    "@typescript-eslint/scope-manager" "4.29.0"
+    debug "^4.3.1"
     functional-red-black-tree "^1.0.1"
-    regexpp "^3.0.0"
-    tsutils "^3.17.1"
+    regexpp "^3.1.0"
+    semver "^7.3.5"
+    tsutils "^3.21.0"
 
-"@typescript-eslint/experimental-utils@2.34.0":
-  version "2.34.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-2.34.0.tgz#d3524b644cdb40eebceca67f8cf3e4cc9c8f980f"
-  integrity sha512-eS6FTkq+wuMJ+sgtuNTtcqavWXqsflWcfBnlYhg/nS4aZ1leewkXGbvBhaapn1q6qf4M71bsR1tez5JTRMuqwA==
+"@typescript-eslint/experimental-utils@4.29.0":
+  version "4.29.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.29.0.tgz#19b1417602d0e1ef325b3312ee95f61220542df5"
+  integrity sha512-FpNVKykfeaIxlArLUP/yQfv/5/3rhl1ov6RWgud4OgbqWLkEq7lqgQU9iiavZRzpzCRQV4XddyFz3wFXdkiX9w==
   dependencies:
-    "@types/json-schema" "^7.0.3"
-    "@typescript-eslint/typescript-estree" "2.34.0"
-    eslint-scope "^5.0.0"
-    eslint-utils "^2.0.0"
+    "@types/json-schema" "^7.0.7"
+    "@typescript-eslint/scope-manager" "4.29.0"
+    "@typescript-eslint/types" "4.29.0"
+    "@typescript-eslint/typescript-estree" "4.29.0"
+    eslint-scope "^5.1.1"
+    eslint-utils "^3.0.0"
 
 "@typescript-eslint/parser@^4.15.2":
   version "4.28.5"
@@ -255,23 +260,23 @@
     "@typescript-eslint/types" "4.28.5"
     "@typescript-eslint/visitor-keys" "4.28.5"
 
+"@typescript-eslint/scope-manager@4.29.0":
+  version "4.29.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-4.29.0.tgz#cf5474f87321bedf416ef65839b693bddd838599"
+  integrity sha512-HPq7XAaDMM3DpmuijxLV9Io8/6pQnliiXMQUcAdjpJJSR+fdmbD/zHCd7hMkjJn04UQtCQBtshgxClzg6NIS2w==
+  dependencies:
+    "@typescript-eslint/types" "4.29.0"
+    "@typescript-eslint/visitor-keys" "4.29.0"
+
 "@typescript-eslint/types@4.28.5":
   version "4.28.5"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.28.5.tgz#d33edf8e429f0c0930a7c3d44e9b010354c422e9"
   integrity sha512-MruOu4ZaDOLOhw4f/6iudyks/obuvvZUAHBDSW80Trnc5+ovmViLT2ZMDXhUV66ozcl6z0LJfKs1Usldgi/WCA==
 
-"@typescript-eslint/typescript-estree@2.34.0":
-  version "2.34.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-2.34.0.tgz#14aeb6353b39ef0732cc7f1b8285294937cf37d5"
-  integrity sha512-OMAr+nJWKdlVM9LOqCqh3pQQPwxHAN7Du8DR6dmwCrAmxtiXQnhHJ6tBNtf+cggqfo51SG/FCwnKhXCIM7hnVg==
-  dependencies:
-    debug "^4.1.1"
-    eslint-visitor-keys "^1.1.0"
-    glob "^7.1.6"
-    is-glob "^4.0.1"
-    lodash "^4.17.15"
-    semver "^7.3.2"
-    tsutils "^3.17.1"
+"@typescript-eslint/types@4.29.0":
+  version "4.29.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.29.0.tgz#c8f1a1e4441ea4aca9b3109241adbc145f7f8a4e"
+  integrity sha512-2YJM6XfWfi8pgU2HRhTp7WgRw78TCRO3dOmSpAvIQ8MOv4B46JD2chnhpNT7Jq8j0APlIbzO1Bach734xxUl4A==
 
 "@typescript-eslint/typescript-estree@4.28.5":
   version "4.28.5"
@@ -286,6 +291,19 @@
     semver "^7.3.5"
     tsutils "^3.21.0"
 
+"@typescript-eslint/typescript-estree@4.29.0":
+  version "4.29.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.29.0.tgz#af7ab547757b86c91bfdbc54ff86845410856256"
+  integrity sha512-8ZpNHDIOyqzzgZrQW9+xQ4k5hM62Xy2R4RPO3DQxMc5Rq5QkCdSpk/drka+DL9w6sXNzV5nrdlBmf8+x495QXQ==
+  dependencies:
+    "@typescript-eslint/types" "4.29.0"
+    "@typescript-eslint/visitor-keys" "4.29.0"
+    debug "^4.3.1"
+    globby "^11.0.3"
+    is-glob "^4.0.1"
+    semver "^7.3.5"
+    tsutils "^3.21.0"
+
 "@typescript-eslint/visitor-keys@4.28.5":
   version "4.28.5"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.28.5.tgz#ffee2c602762ed6893405ee7c1144d9cc0a29675"
@@ -294,6 +312,14 @@
     "@typescript-eslint/types" "4.28.5"
     eslint-visitor-keys "^2.0.0"
 
+"@typescript-eslint/visitor-keys@4.29.0":
+  version "4.29.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.29.0.tgz#1ff60f240def4d85ea68d4fd2e4e9759b7850c04"
+  integrity sha512-LoaofO1C/jAJYs0uEpYMXfHboGXzOJeV118X4OsZu9f7rG7Pr9B3+4HTU8+err81rADa4xfQmAxnRnPAI2jp+Q==
+  dependencies:
+    "@typescript-eslint/types" "4.29.0"
+    eslint-visitor-keys "^2.0.0"
+
 acorn-jsx@^5.1.0:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.1.0.tgz#294adb71b57398b0680015f0a38c563ee1db5384"
@@ -1026,6 +1052,14 @@ eslint-scope@^5.0.0:
     esrecurse "^4.1.0"
     estraverse "^4.1.1"
 
+eslint-scope@^5.1.1:
+  version "5.1.1"
+  resolved "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-5.1.1.tgz#e786e59a66cb92b3f6c1fb0d508aab174848f48c"
+  integrity sha512-2NxwbF/hZ0KpepYN0cNbo+FN6XoK7GaHlQhgx/hIZl6Va0bF45RQOOwhLIy8lQDbuCiadSLCBnH2CFYquit5bw==
+  dependencies:
+    esrecurse "^4.3.0"
+    estraverse "^4.1.1"
+
 eslint-utils@^1.4.3:
   version "1.4.3"
   resolved "https://registry.yarnpkg.com/eslint-utils/-/eslint-utils-1.4.3.tgz#74fec7c54d0776b6f67e0251040b5806564e981f"
@@ -1033,12 +1067,12 @@ eslint-utils@^1.4.3:
   dependencies:
     eslint-visitor-keys "^1.1.0"
 
-eslint-utils@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/eslint-utils/-/eslint-utils-2.0.0.tgz#7be1cc70f27a72a76cd14aa698bcabed6890e1cd"
-  integrity sha512-0HCPuJv+7Wv1bACm8y5/ECVfYdfsAm9xmVb7saeFlxjPYALefjhbYoCkBjPdPzGH8wWyTpAez82Fh3VKYEZ8OA==
+eslint-utils@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/eslint-utils/-/eslint-utils-3.0.0.tgz#8aebaface7345bb33559db0a1f13a1d2d48c3672"
+  integrity sha512-uuQC43IGctw68pJA1RgbQS8/NP7rch6Cwd4j3ZBtgo4/8Flj4eGE7ZYSZRN3iq5pVUv6GPdW5Z1RFleo84uLDA==
   dependencies:
-    eslint-visitor-keys "^1.1.0"
+    eslint-visitor-keys "^2.0.0"
 
 eslint-visitor-keys@^1.1.0:
   version "1.1.0"
@@ -1121,11 +1155,23 @@ esrecurse@^4.1.0:
   dependencies:
     estraverse "^4.1.0"
 
+esrecurse@^4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/esrecurse/-/esrecurse-4.3.0.tgz#7ad7964d679abb28bee72cec63758b1c5d2c9921"
+  integrity sha512-KmfKL3b6G+RXvP8N1vr3Tq1kL/oCFgn2NYXEtqP8/L3pKapUA4G8cFVaoF3SU323CD4XypR/ffioHmkti6/Tag==
+  dependencies:
+    estraverse "^5.2.0"
+
 estraverse@^4.0.0, estraverse@^4.1.0, estraverse@^4.1.1:
   version "4.3.0"
   resolved "https://registry.yarnpkg.com/estraverse/-/estraverse-4.3.0.tgz#398ad3f3c5a24948be7725e83d11a7de28cdbd1d"
   integrity sha512-39nnKffWz8xN1BU/2c79n9nB9HDzo0niYUqx6xyqUnyoAnQyyWpOTdZEeiCch8BBu515t4wp9ZmgVfVhn9EBpw==
 
+estraverse@^5.2.0:
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/estraverse/-/estraverse-5.2.0.tgz#307df42547e6cc7324d3cf03c155d5cdb8c53880"
+  integrity sha512-BxbNGGNm0RyRYvUdHpIwv9IWzeM9XClbOxwoATuFdOE7ZE6wHL+HQ5T8hoPM+zHvmKzzsEqhgy0GrQ5X13afiQ==
+
 esutils@^2.0.2, esutils@^2.0.3:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.3.tgz#74d2eb4de0b8da1293711910d50775b9b710ef64"
@@ -2411,10 +2457,10 @@ regexpp@^2.0.1:
   resolved "https://registry.yarnpkg.com/regexpp/-/regexpp-2.0.1.tgz#8d19d31cf632482b589049f8281f93dbcba4d07f"
   integrity sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw==
 
-regexpp@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/regexpp/-/regexpp-3.0.0.tgz#dd63982ee3300e67b41c1956f850aa680d9d330e"
-  integrity sha512-Z+hNr7RAVWxznLPuA7DIh8UNX1j9CDrUQxskw9IrBE1Dxue2lyXT+shqEIeLUjrokxIP8CMy1WkjgG3rTsd5/g==
+regexpp@^3.1.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/regexpp/-/regexpp-3.2.0.tgz#0425a2768d8f23bad70ca4b90461fa2f1213e1b2"
+  integrity sha512-pq2bWo9mVD43nbts2wGv17XLiNLya+GklZ8kaDLV2Z08gDCsGpnKn9BFMepvWuHCbyVvY7J5o5+BVvoQbmlJLg==
 
 registry-auth-token@^4.0.0:
   version "4.0.0"
@@ -2576,12 +2622,7 @@ semver@^6.0.0, semver@^6.1.2, semver@^6.2.0, semver@^6.3.0:
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
   integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
 
-semver@^7.3.2:
-  version "7.3.2"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.2.tgz#604962b052b81ed0786aae84389ffba70ffd3938"
-  integrity sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ==
-
-semver@^7.3.5:
+semver@^7.3.2, semver@^7.3.5:
   version "7.3.5"
   resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.5.tgz#0b621c879348d8998e4b0e4be94b3f12e6018ef7"
   integrity sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==
@@ -2900,13 +2941,6 @@ tslib@^1.8.1, tslib@^1.9.0:
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.10.0.tgz#c3c19f95973fb0a62973fb09d90d961ee43e5c8a"
   integrity sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==
 
-tsutils@^3.17.1:
-  version "3.17.1"
-  resolved "https://registry.yarnpkg.com/tsutils/-/tsutils-3.17.1.tgz#ed719917f11ca0dee586272b2ac49e015a2dd759"
-  integrity sha512-kzeQ5B8H3w60nFY2g8cJIuH7JDpsALXySGtwGJ0p2LSjLgay3NdIpqq5SoOBe46bKDW2iq25irHCr8wjomUS2g==
-  dependencies:
-    tslib "^1.8.1"
-
 tsutils@^3.21.0:
   version "3.21.0"
   resolved "https://registry.yarnpkg.com/tsutils/-/tsutils-3.21.0.tgz#b48717d394cea6c1e096983eed58e9d61715b623"