diff --git a/package.json b/package.json
index 2aca15f1..9bbe7db4 100644
--- a/package.json
+++ b/package.json
@@ -78,7 +78,7 @@
     "@types/lodash": "^4.14.165",
     "@types/node": "^14.14.10",
     "@types/sinon": "^9.0.9",
-    "@typescript-eslint/eslint-plugin": "^4.8.2",
+    "@typescript-eslint/eslint-plugin": "^4.9.0",
     "@typescript-eslint/parser": "^4.8.2",
     "ava": "^3.13.0",
     "benny": "^3.6.15",
diff --git a/yarn.lock b/yarn.lock
index a9752f68..3e69bf02 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -526,28 +526,28 @@
   dependencies:
     "@types/node" "*"
 
-"@typescript-eslint/eslint-plugin@^4.8.2":
-  version "4.8.2"
-  resolved "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.8.2.tgz#cf9102ec800391caa574f589ffe0623cca1d9308"
-  integrity sha512-gQ06QLV5l1DtvYtqOyFLXD9PdcILYqlrJj2l+CGDlPtmgLUzc1GpqciJFIRvyfvgLALpnxYINFuw+n9AZhPBKQ==
+"@typescript-eslint/eslint-plugin@^4.9.0":
+  version "4.9.0"
+  resolved "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.9.0.tgz#8fde15743413661fdc086c9f1f5d74a80b856113"
+  integrity sha512-WrVzGMzzCrgrpnQMQm4Tnf+dk+wdl/YbgIgd5hKGa2P+lnJ2MON+nQnbwgbxtN9QDLi8HO+JAq0/krMnjQK6Cw==
   dependencies:
-    "@typescript-eslint/experimental-utils" "4.8.2"
-    "@typescript-eslint/scope-manager" "4.8.2"
+    "@typescript-eslint/experimental-utils" "4.9.0"
+    "@typescript-eslint/scope-manager" "4.9.0"
     debug "^4.1.1"
     functional-red-black-tree "^1.0.1"
     regexpp "^3.0.0"
     semver "^7.3.2"
     tsutils "^3.17.1"
 
-"@typescript-eslint/experimental-utils@4.8.2":
-  version "4.8.2"
-  resolved "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-4.8.2.tgz#8909a5732f19329cf5ef0c39766170476bff5e50"
-  integrity sha512-hpTw6o6IhBZEsQsjuw/4RWmceRyESfAiEzAEnXHKG1X7S5DXFaZ4IO1JO7CW1aQ604leQBzjZmuMI9QBCAJX8Q==
+"@typescript-eslint/experimental-utils@4.9.0":
+  version "4.9.0"
+  resolved "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-4.9.0.tgz#23a296b85d243afba24e75a43fd55aceda5141f0"
+  integrity sha512-0p8GnDWB3R2oGhmRXlEnCvYOtaBCijtA5uBfH5GxQKsukdSQyI4opC4NGTUb88CagsoNQ4rb/hId2JuMbzWKFQ==
   dependencies:
     "@types/json-schema" "^7.0.3"
-    "@typescript-eslint/scope-manager" "4.8.2"
-    "@typescript-eslint/types" "4.8.2"
-    "@typescript-eslint/typescript-estree" "4.8.2"
+    "@typescript-eslint/scope-manager" "4.9.0"
+    "@typescript-eslint/types" "4.9.0"
+    "@typescript-eslint/typescript-estree" "4.9.0"
     eslint-scope "^5.0.0"
     eslint-utils "^2.0.0"
 
@@ -569,11 +569,24 @@
     "@typescript-eslint/types" "4.8.2"
     "@typescript-eslint/visitor-keys" "4.8.2"
 
+"@typescript-eslint/scope-manager@4.9.0":
+  version "4.9.0"
+  resolved "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-4.9.0.tgz#5eefe305d6b71d1c85af6587b048426bfd4d3708"
+  integrity sha512-q/81jtmcDtMRE+nfFt5pWqO0R41k46gpVLnuefqVOXl4QV1GdQoBWfk5REcipoJNQH9+F5l+dwa9Li5fbALjzg==
+  dependencies:
+    "@typescript-eslint/types" "4.9.0"
+    "@typescript-eslint/visitor-keys" "4.9.0"
+
 "@typescript-eslint/types@4.8.2":
   version "4.8.2"
   resolved "https://registry.npmjs.org/@typescript-eslint/types/-/types-4.8.2.tgz#c862dd0e569d9478eb82d6aee662ea53f5661a36"
   integrity sha512-z1/AVcVF8ju5ObaHe2fOpZYEQrwHyZ7PTOlmjd3EoFeX9sv7UekQhfrCmgUO7PruLNfSHrJGQvrW3Q7xQ8EoAw==
 
+"@typescript-eslint/types@4.9.0":
+  version "4.9.0"
+  resolved "https://registry.npmjs.org/@typescript-eslint/types/-/types-4.9.0.tgz#3fe8c3632abd07095c7458f7451bd14c85d0033c"
+  integrity sha512-luzLKmowfiM/IoJL/rus1K9iZpSJK6GlOS/1ezKplb7MkORt2dDcfi8g9B0bsF6JoRGhqn0D3Va55b+vredFHA==
+
 "@typescript-eslint/typescript-estree@4.8.2":
   version "4.8.2"
   resolved "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.8.2.tgz#eeec34707d8577600fb21661b5287226cc8b3bed"
@@ -588,6 +601,20 @@
     semver "^7.3.2"
     tsutils "^3.17.1"
 
+"@typescript-eslint/typescript-estree@4.9.0":
+  version "4.9.0"
+  resolved "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.9.0.tgz#38a98df6ee281cfd6164d6f9d91795b37d9e508c"
+  integrity sha512-rmDR++PGrIyQzAtt3pPcmKWLr7MA+u/Cmq9b/rON3//t5WofNR4m/Ybft2vOLj0WtUzjn018ekHjTsnIyBsQug==
+  dependencies:
+    "@typescript-eslint/types" "4.9.0"
+    "@typescript-eslint/visitor-keys" "4.9.0"
+    debug "^4.1.1"
+    globby "^11.0.1"
+    is-glob "^4.0.1"
+    lodash "^4.17.15"
+    semver "^7.3.2"
+    tsutils "^3.17.1"
+
 "@typescript-eslint/visitor-keys@4.8.2":
   version "4.8.2"
   resolved "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-4.8.2.tgz#62cd3fbbbf65f8eccfbe6f159eb1b84a243a3f77"
@@ -596,6 +623,14 @@
     "@typescript-eslint/types" "4.8.2"
     eslint-visitor-keys "^2.0.0"
 
+"@typescript-eslint/visitor-keys@4.9.0":
+  version "4.9.0"
+  resolved "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-4.9.0.tgz#f284e9fac43f2d6d35094ce137473ee321f266c8"
+  integrity sha512-sV45zfdRqQo1A97pOSx3fsjR+3blmwtdCt8LDrXgCX36v4Vmz4KHrhpV6Fo2cRdXmyumxx11AHw0pNJqCNpDyg==
+  dependencies:
+    "@typescript-eslint/types" "4.9.0"
+    eslint-visitor-keys "^2.0.0"
+
 acorn-jsx@^5.2.0:
   version "5.3.1"
   resolved "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.1.tgz#fc8661e11b7ac1539c47dbfea2e72b3af34d267b"