diff --git a/package.json b/package.json
index 3d6f57ffc..c34447937 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "@ava/typescript": "^1.1.1",
     "@typescript-eslint/eslint-plugin": "^4.23.0",
-    "@typescript-eslint/parser": "^3.10.1",
+    "@typescript-eslint/parser": "^4.23.0",
     "ava": "^3.15.0",
     "eslint": "^7.26.0",
     "eslint-config-klasa": "dirigeants/klasa-lint",
diff --git a/yarn.lock b/yarn.lock
index dc9e8e40a..1a42b89cf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -285,11 +285,6 @@
   resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
   integrity sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==
 
-"@types/eslint-visitor-keys@^1.0.0":
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#1ee30d79544ca84d68d4b3cdb0af4f205663dd2d"
-  integrity sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==
-
 "@types/json-schema@^7.0.3":
   version "7.0.4"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.4.tgz#38fd73ddfd9b55abb1e1b2ed578cb55bd7b7d339"
@@ -327,17 +322,6 @@
     semver "^7.3.2"
     tsutils "^3.17.1"
 
-"@typescript-eslint/experimental-utils@3.10.1":
-  version "3.10.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-3.10.1.tgz#e179ffc81a80ebcae2ea04e0332f8b251345a686"
-  integrity sha512-DewqIgscDzmAfd5nOGe4zm6Bl7PKtMG2Ad0KG8CUZAHlXfAKTF9Ol5PXhiMh39yRL2ChRH1cuuUGOcVyyrhQIw==
-  dependencies:
-    "@types/json-schema" "^7.0.3"
-    "@typescript-eslint/types" "3.10.1"
-    "@typescript-eslint/typescript-estree" "3.10.1"
-    eslint-scope "^5.0.0"
-    eslint-utils "^2.0.0"
-
 "@typescript-eslint/experimental-utils@4.23.0":
   version "4.23.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.23.0.tgz#f2059434cd6e5672bfeab2fb03b7c0a20622266f"
@@ -350,16 +334,15 @@
     eslint-scope "^5.0.0"
     eslint-utils "^2.0.0"
 
-"@typescript-eslint/parser@^3.10.1":
-  version "3.10.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-3.10.1.tgz#1883858e83e8b442627e1ac6f408925211155467"
-  integrity sha512-Ug1RcWcrJP02hmtaXVS3axPPTTPnZjupqhgj+NnZ6BCkwSImWk/283347+x9wN+lqOdK9Eo3vsyiyDHgsmiEJw==
+"@typescript-eslint/parser@^4.23.0":
+  version "4.23.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-4.23.0.tgz#239315d38e42e852bef43a4b0b01bef78f78911c"
+  integrity sha512-wsvjksHBMOqySy/Pi2Q6UuIuHYbgAMwLczRl4YanEPKW5KVxI9ZzDYh3B5DtcZPQTGRWFJrfcbJ6L01Leybwug==
   dependencies:
-    "@types/eslint-visitor-keys" "^1.0.0"
-    "@typescript-eslint/experimental-utils" "3.10.1"
-    "@typescript-eslint/types" "3.10.1"
-    "@typescript-eslint/typescript-estree" "3.10.1"
-    eslint-visitor-keys "^1.1.0"
+    "@typescript-eslint/scope-manager" "4.23.0"
+    "@typescript-eslint/types" "4.23.0"
+    "@typescript-eslint/typescript-estree" "4.23.0"
+    debug "^4.1.1"
 
 "@typescript-eslint/scope-manager@4.23.0":
   version "4.23.0"
@@ -369,30 +352,11 @@
     "@typescript-eslint/types" "4.23.0"
     "@typescript-eslint/visitor-keys" "4.23.0"
 
-"@typescript-eslint/types@3.10.1":
-  version "3.10.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-3.10.1.tgz#1d7463fa7c32d8a23ab508a803ca2fe26e758727"
-  integrity sha512-+3+FCUJIahE9q0lDi1WleYzjCwJs5hIsbugIgnbB+dSCYUxl8L6PwmsyOPFZde2hc1DlTo/xnkOgiTLSyAbHiQ==
-
 "@typescript-eslint/types@4.23.0":
   version "4.23.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.23.0.tgz#da1654c8a5332f4d1645b2d9a1c64193cae3aa3b"
   integrity sha512-oqkNWyG2SLS7uTWLZf6Sr7Dm02gA5yxiz1RP87tvsmDsguVATdpVguHr4HoGOcFOpCvx9vtCSCyQUGfzq28YCw==
 
-"@typescript-eslint/typescript-estree@3.10.1":
-  version "3.10.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-3.10.1.tgz#fd0061cc38add4fad45136d654408569f365b853"
-  integrity sha512-QbcXOuq6WYvnB3XPsZpIwztBoquEYLXh2MtwVU+kO8jgYCiv4G5xrSP/1wg4tkvrEE+esZVquIPX/dxPlePk1w==
-  dependencies:
-    "@typescript-eslint/types" "3.10.1"
-    "@typescript-eslint/visitor-keys" "3.10.1"
-    debug "^4.1.1"
-    glob "^7.1.6"
-    is-glob "^4.0.1"
-    lodash "^4.17.15"
-    semver "^7.3.2"
-    tsutils "^3.17.1"
-
 "@typescript-eslint/typescript-estree@4.23.0":
   version "4.23.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.23.0.tgz#0753b292097523852428a6f5a1aa8ccc1aae6cd9"
@@ -406,13 +370,6 @@
     semver "^7.3.2"
     tsutils "^3.17.1"
 
-"@typescript-eslint/visitor-keys@3.10.1":
-  version "3.10.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-3.10.1.tgz#cd4274773e3eb63b2e870ac602274487ecd1e931"
-  integrity sha512-9JgC82AaQeglebjZMgYR5wgmfUdUc+EitGUUMW8u2nDckaeimzW+VsoLV6FoimPv2id3VQzfjwBxEMVz08ameQ==
-  dependencies:
-    eslint-visitor-keys "^1.1.0"
-
 "@typescript-eslint/visitor-keys@4.23.0":
   version "4.23.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.23.0.tgz#7215cc977bd3b4ef22467b9023594e32f9e4e455"