diff --git a/package.json b/package.json
index c1f8600..ee5fc2d 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "@types/pug": "^2.0.4",
     "@types/url-parse": "^1.4.3",
     "@typescript-eslint/eslint-plugin": "^4.15.0",
-    "@typescript-eslint/parser": "^4.15.0",
+    "@typescript-eslint/parser": "^4.28.5",
     "@udacity/types-service-worker-mock": "^1.2.0",
     "awesome-pug-jest": "^1.1.0",
     "cloudflare-worker-mock": "^1.2.0",
diff --git a/yarn.lock b/yarn.lock
index 51a1ce1..403faa1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -722,15 +722,15 @@
     eslint-scope "^5.0.0"
     eslint-utils "^2.0.0"
 
-"@typescript-eslint/parser@^4.15.0":
-  version "4.15.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-4.15.0.tgz#8df94365b4b7161f9e8514fe28aef19954810b6b"
-  integrity sha512-L6Dtbq8Bc7g2aZwnIBETpmUa9XDKCMzKVwAArnGp5Mn7PRNFjf3mUzq8UeBjL3K8t311hvevnyqXAMSmxO8Gpg==
+"@typescript-eslint/parser@^4.28.5":
+  version "4.28.5"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-4.28.5.tgz#9c971668f86d1b5c552266c47788a87488a47d1c"
+  integrity sha512-NPCOGhTnkXGMqTznqgVbA5LqVsnw+i3+XA1UKLnAb+MG1Y1rP4ZSK9GX0kJBmAZTMIktf+dTwXToT6kFwyimbw==
   dependencies:
-    "@typescript-eslint/scope-manager" "4.15.0"
-    "@typescript-eslint/types" "4.15.0"
-    "@typescript-eslint/typescript-estree" "4.15.0"
-    debug "^4.1.1"
+    "@typescript-eslint/scope-manager" "4.28.5"
+    "@typescript-eslint/types" "4.28.5"
+    "@typescript-eslint/typescript-estree" "4.28.5"
+    debug "^4.3.1"
 
 "@typescript-eslint/scope-manager@4.15.0":
   version "4.15.0"
@@ -740,11 +740,24 @@
     "@typescript-eslint/types" "4.15.0"
     "@typescript-eslint/visitor-keys" "4.15.0"
 
+"@typescript-eslint/scope-manager@4.28.5":
+  version "4.28.5"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-4.28.5.tgz#3a1b70c50c1535ac33322786ea99ebe403d3b923"
+  integrity sha512-PHLq6n9nTMrLYcVcIZ7v0VY1X7dK309NM8ya9oL/yG8syFINIMHxyr2GzGoBYUdv3NUfCOqtuqps0ZmcgnZTfQ==
+  dependencies:
+    "@typescript-eslint/types" "4.28.5"
+    "@typescript-eslint/visitor-keys" "4.28.5"
+
 "@typescript-eslint/types@4.15.0":
   version "4.15.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.15.0.tgz#3011ae1ac3299bb9a5ac56bdd297cccf679d3662"
   integrity sha512-su4RHkJhS+iFwyqyXHcS8EGPlUVoC+XREfy5daivjLur9JP8GhvTmDipuRpcujtGC4M+GYhUOJCPDE3rC5NJrg==
 
+"@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@4.15.0":
   version "4.15.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.15.0.tgz#402c86a7d2111c1f7a2513022f22a38a395b7f93"
@@ -758,6 +771,19 @@
     semver "^7.3.2"
     tsutils "^3.17.1"
 
+"@typescript-eslint/typescript-estree@4.28.5":
+  version "4.28.5"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.28.5.tgz#4906d343de693cf3d8dcc301383ed638e0441cd1"
+  integrity sha512-FzJUKsBX8poCCdve7iV7ShirP8V+ys2t1fvamVeD1rWpiAnIm550a+BX/fmTHrjEpQJ7ZAn+Z7ZZwJjytk9rZw==
+  dependencies:
+    "@typescript-eslint/types" "4.28.5"
+    "@typescript-eslint/visitor-keys" "4.28.5"
+    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@4.15.0":
   version "4.15.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.15.0.tgz#2a07768df30c8a5673f1bce406338a07fdec38ca"
@@ -766,6 +792,14 @@
     "@typescript-eslint/types" "4.15.0"
     eslint-visitor-keys "^2.0.0"
 
+"@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"
+  integrity sha512-dva/7Rr+EkxNWdJWau26xU/0slnFlkh88v3TsyTgRS/IIYFi5iIfpCFM4ikw0vQTFUR9FYSSyqgK4w64gsgxhg==
+  dependencies:
+    "@typescript-eslint/types" "4.28.5"
+    eslint-visitor-keys "^2.0.0"
+
 "@udacity/types-service-worker-mock@^1.2.0":
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/@udacity/types-service-worker-mock/-/types-service-worker-mock-1.2.0.tgz#f047a26d036469f11b8f0f50d4c0901ae999bb93"
@@ -2220,12 +2254,12 @@ data-urls@^2.0.0:
     whatwg-mimetype "^2.3.0"
     whatwg-url "^8.0.0"
 
-debug@4, debug@^4.0.1, debug@^4.1.0, debug@^4.1.1:
-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-4.1.1.tgz#3b72260255109c6b589cee050f1d516139664791"
-  integrity sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==
+debug@4, debug@^4.0.1, debug@^4.1.0, debug@^4.1.1, debug@^4.3.1:
+  version "4.3.2"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-4.3.2.tgz#f0a49c18ac8779e31d4a0c6029dfb76873c7428b"
+  integrity sha512-mOp8wKcvj7XxC78zLgw/ZA+6TSgkoE2C/ienthhRD298T7UNwAg9diBpLRxC0mOezLl4B0xV7M0cCO6P/O0Xhw==
   dependencies:
-    ms "^2.1.1"
+    ms "2.1.2"
 
 debug@=3.1.0:
   version "3.1.0"
@@ -3176,6 +3210,18 @@ globby@^11.0.1:
     merge2 "^1.3.0"
     slash "^3.0.0"
 
+globby@^11.0.3:
+  version "11.0.4"
+  resolved "https://registry.yarnpkg.com/globby/-/globby-11.0.4.tgz#2cbaff77c2f2a62e71e9b2813a67b97a3a3001a5"
+  integrity sha512-9O4MVG9ioZJ08ffbcyVYyLOJLk5JQ688pJ4eMGLpdWLHq/Wr1D9BlriLQyL0E+jbkuePVZXYFj47QM/v093wHg==
+  dependencies:
+    array-union "^2.1.0"
+    dir-glob "^3.0.1"
+    fast-glob "^3.1.1"
+    ignore "^5.1.4"
+    merge2 "^1.3.0"
+    slash "^3.0.0"
+
 graceful-fs@^4.1.11, graceful-fs@^4.1.15, graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.2.0, graceful-fs@^4.2.4:
   version "4.2.4"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.4.tgz#2256bde14d3632958c465ebc96dc467ca07a29fb"
@@ -4753,7 +4799,7 @@ ms@2.0.0:
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
   integrity sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=
 
-ms@^2.1.1:
+ms@2.1.2:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.2.tgz#d09d1f357b443f493382a8eb3ccd183872ae6009"
   integrity sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==
@@ -6332,6 +6378,13 @@ semver@^6.0.0, semver@^6.3.0:
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
   integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
 
+semver@^7.3.5:
+  version "7.3.5"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.5.tgz#0b621c879348d8998e4b0e4be94b3f12e6018ef7"
+  integrity sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==
+  dependencies:
+    lru-cache "^6.0.0"
+
 serialize-javascript@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/serialize-javascript/-/serialize-javascript-4.0.0.tgz#b525e1238489a5ecfc42afacc3fe99e666f4b1aa"
@@ -7075,6 +7128,13 @@ tsutils@^3.17.1:
   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"
+  integrity sha512-mHKK3iUXL+3UF6xL5k0PEhKRUBKPBCv/+RkEOpjRWxxx27KKRBmmA60A9pgOUvMi8GKhRMPEmjBRPzs2W7O1OA==
+  dependencies:
+    tslib "^1.8.1"
+
 tty-browserify@0.0.0:
   version "0.0.0"
   resolved "https://registry.yarnpkg.com/tty-browserify/-/tty-browserify-0.0.0.tgz#a157ba402da24e9bf957f9aa69d524eed42901a6"