diff --git a/package.json b/package.json
index 65c4be785..bc60b8d75 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "@ava/typescript": "^1.1.1",
     "@typescript-eslint/eslint-plugin": "^4.19.0",
-    "@typescript-eslint/parser": "^3.10.1",
+    "@typescript-eslint/parser": "^4.20.0",
     "ava": "^3.15.0",
     "eslint": "^7.23.0",
     "eslint-config-klasa": "dirigeants/klasa-lint",
diff --git a/yarn.lock b/yarn.lock
index 5fb8fd724..17cc2c7a6 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@4.19.0":
   version "4.19.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.19.0.tgz#9ca379919906dc72cb0fcd817d6cb5aa2d2054c6"
@@ -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@^4.20.0":
+  version "4.20.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-4.20.0.tgz#8dd403c8b4258b99194972d9799e201b8d083bdd"
+  integrity sha512-m6vDtgL9EABdjMtKVw5rr6DdeMCH3OA1vFb0dAyuZSa3e5yw1YRzlwFnm9knma9Lz6b2GPvoNSa8vOXrqsaglA==
   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" "4.20.0"
+    "@typescript-eslint/types" "4.20.0"
+    "@typescript-eslint/typescript-estree" "4.20.0"
+    debug "^4.1.1"
 
 "@typescript-eslint/scope-manager@4.19.0":
   version "4.19.0"
@@ -369,29 +352,23 @@
     "@typescript-eslint/types" "4.19.0"
     "@typescript-eslint/visitor-keys" "4.19.0"
 
-"@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/scope-manager@4.20.0":
+  version "4.20.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-4.20.0.tgz#953ecbf3b00845ece7be66246608be9d126d05ca"
+  integrity sha512-/zm6WR6iclD5HhGpcwl/GOYDTzrTHmvf8LLLkwKqqPKG6+KZt/CfSgPCiybshmck66M2L5fWSF/MKNuCwtKQSQ==
+  dependencies:
+    "@typescript-eslint/types" "4.20.0"
+    "@typescript-eslint/visitor-keys" "4.20.0"
 
 "@typescript-eslint/types@4.19.0":
   version "4.19.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.19.0.tgz#5181d5d2afd02e5b8f149ebb37ffc8bd7b07a568"
   integrity sha512-A4iAlexVvd4IBsSTNxdvdepW0D4uR/fwxDrKUa+iEY9UWvGREu2ZyB8ylTENM1SH8F7bVC9ac9+si3LWNxcBuA==
 
-"@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/types@4.20.0":
+  version "4.20.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.20.0.tgz#c6cf5ef3c9b1c8f699a9bbdafb7a1da1ca781225"
+  integrity sha512-cYY+1PIjei1nk49JAPnH1VEnu7OYdWRdJhYI5wiKOUMhLTG1qsx5cQxCUTuwWCmQoyriadz3Ni8HZmGSofeC+w==
 
 "@typescript-eslint/typescript-estree@4.19.0":
   version "4.19.0"
@@ -406,12 +383,18 @@
     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==
+"@typescript-eslint/typescript-estree@4.20.0":
+  version "4.20.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.20.0.tgz#8b3b08f85f18a8da5d88f65cb400f013e88ab7be"
+  integrity sha512-Knpp0reOd4ZsyoEJdW8i/sK3mtZ47Ls7ZHvD8WVABNx5Xnn7KhenMTRGegoyMTx6TiXlOVgMz9r0pDgXTEEIHA==
   dependencies:
-    eslint-visitor-keys "^1.1.0"
+    "@typescript-eslint/types" "4.20.0"
+    "@typescript-eslint/visitor-keys" "4.20.0"
+    debug "^4.1.1"
+    globby "^11.0.1"
+    is-glob "^4.0.1"
+    semver "^7.3.2"
+    tsutils "^3.17.1"
 
 "@typescript-eslint/visitor-keys@4.19.0":
   version "4.19.0"
@@ -421,6 +404,14 @@
     "@typescript-eslint/types" "4.19.0"
     eslint-visitor-keys "^2.0.0"
 
+"@typescript-eslint/visitor-keys@4.20.0":
+  version "4.20.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.20.0.tgz#1e84db034da13f208325e6bfc995c3b75f7dbd62"
+  integrity sha512-NXKRM3oOVQL8yNFDNCZuieRIwZ5UtjNLYtmMx2PacEAGmbaEYtGgVHUHVyZvU/0rYZcizdrWjDo+WBtRPSgq+A==
+  dependencies:
+    "@typescript-eslint/types" "4.20.0"
+    eslint-visitor-keys "^2.0.0"
+
 abort-controller@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/abort-controller/-/abort-controller-3.0.0.tgz#eaf54d53b62bae4138e809ca225c8439a6efb392"