diff --git a/package.json b/package.json
index c1f8600..2ee3937 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "@types/node": "^14.14.27",
     "@types/pug": "^2.0.4",
     "@types/url-parse": "^1.4.3",
-    "@typescript-eslint/eslint-plugin": "^4.15.0",
+    "@typescript-eslint/eslint-plugin": "^4.28.4",
     "@typescript-eslint/parser": "^4.15.0",
     "@udacity/types-service-worker-mock": "^1.2.0",
     "awesome-pug-jest": "^1.1.0",
diff --git a/yarn.lock b/yarn.lock
index 51a1ce1..c97a06d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -639,16 +639,16 @@
     jest-diff "^26.0.0"
     pretty-format "^26.0.0"
 
-"@types/json-schema@^7.0.3":
-  version "7.0.5"
-  resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.5.tgz#dcce4430e64b443ba8945f0290fb564ad5bac6dd"
-  integrity sha512-7+2BITlgjgDhH0vvwZU/HZJVyk+2XUlvxXe8dFMedNX/aMkaOq++rMAFXc0tM7ij15QaWlbdQASBR9dihi+bDQ==
-
 "@types/json-schema@^7.0.6":
   version "7.0.6"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.6.tgz#f4c7ec43e81b319a9815115031709f26987891f0"
   integrity sha512-3c+yGKvVP5Y9TYBEibGNR+kLtijnj7mYrXRg+WpFb2X9xm04g/DXYkfg4hmzJQosc9snFNUPkbYIhu+KAm6jJw==
 
+"@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@*", "@types/node@^14.14.27":
   version "14.14.27"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-14.14.27.tgz#c7127f8da0498993e13b1a42faf1303d3110d2f2"
@@ -696,31 +696,30 @@
   dependencies:
     "@types/yargs-parser" "*"
 
-"@typescript-eslint/eslint-plugin@^4.15.0":
-  version "4.15.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.15.0.tgz#13a5a07cf30d0d5781e43480aa2a8d38d308b084"
-  integrity sha512-DJgdGZW+8CFUTz5C/dnn4ONcUm2h2T0itWD85Ob5/V27Ndie8hUoX5HKyGssvR8sUMkAIlUc/AMK67Lqa3kBIQ==
+"@typescript-eslint/eslint-plugin@^4.28.4":
+  version "4.28.4"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.28.4.tgz#e73c8cabbf3f08dee0e1bda65ed4e622ae8f8921"
+  integrity sha512-s1oY4RmYDlWMlcV0kKPBaADn46JirZzvvH7c2CtAqxCY96S538JRBAzt83RrfkDheV/+G/vWNK0zek+8TB3Gmw==
   dependencies:
-    "@typescript-eslint/experimental-utils" "4.15.0"
-    "@typescript-eslint/scope-manager" "4.15.0"
-    debug "^4.1.1"
+    "@typescript-eslint/experimental-utils" "4.28.4"
+    "@typescript-eslint/scope-manager" "4.28.4"
+    debug "^4.3.1"
     functional-red-black-tree "^1.0.1"
-    lodash "^4.17.15"
-    regexpp "^3.0.0"
-    semver "^7.3.2"
-    tsutils "^3.17.1"
-
-"@typescript-eslint/experimental-utils@4.15.0":
-  version "4.15.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.15.0.tgz#b87c36410a9b23f637689427be85007a2ec1a9c6"
-  integrity sha512-V4vaDWvxA2zgesg4KPgEGiomWEBpJXvY4ZX34Y3qxK8LUm5I87L+qGIOTd9tHZOARXNRt9pLbblSKiYBlGMawg==
-  dependencies:
-    "@types/json-schema" "^7.0.3"
-    "@typescript-eslint/scope-manager" "4.15.0"
-    "@typescript-eslint/types" "4.15.0"
-    "@typescript-eslint/typescript-estree" "4.15.0"
-    eslint-scope "^5.0.0"
-    eslint-utils "^2.0.0"
+    regexpp "^3.1.0"
+    semver "^7.3.5"
+    tsutils "^3.21.0"
+
+"@typescript-eslint/experimental-utils@4.28.4":
+  version "4.28.4"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.28.4.tgz#9c70c35ebed087a5c70fb0ecd90979547b7fec96"
+  integrity sha512-OglKWOQRWTCoqMSy6pm/kpinEIgdcXYceIcH3EKWUl4S8xhFtN34GQRaAvTIZB9DD94rW7d/U7tUg3SYeDFNHA==
+  dependencies:
+    "@types/json-schema" "^7.0.7"
+    "@typescript-eslint/scope-manager" "4.28.4"
+    "@typescript-eslint/types" "4.28.4"
+    "@typescript-eslint/typescript-estree" "4.28.4"
+    eslint-scope "^5.1.1"
+    eslint-utils "^3.0.0"
 
 "@typescript-eslint/parser@^4.15.0":
   version "4.15.0"
@@ -740,11 +739,24 @@
     "@typescript-eslint/types" "4.15.0"
     "@typescript-eslint/visitor-keys" "4.15.0"
 
+"@typescript-eslint/scope-manager@4.28.4":
+  version "4.28.4"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-4.28.4.tgz#bdbce9b6a644e34f767bd68bc17bb14353b9fe7f"
+  integrity sha512-ZJBNs4usViOmlyFMt9X9l+X0WAFcDH7EdSArGqpldXu7aeZxDAuAzHiMAeI+JpSefY2INHrXeqnha39FVqXb8w==
+  dependencies:
+    "@typescript-eslint/types" "4.28.4"
+    "@typescript-eslint/visitor-keys" "4.28.4"
+
 "@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@4.28.4":
+  version "4.28.4"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.28.4.tgz#41acbd79b5816b7c0dd7530a43d97d020d3aeb42"
+  integrity sha512-3eap4QWxGqkYuEmVebUGULMskR6Cuoc/Wii0oSOddleP4EGx1tjLnZQ0ZP33YRoMDCs5O3j56RBV4g14T4jvww==
+
 "@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 +770,19 @@
     semver "^7.3.2"
     tsutils "^3.17.1"
 
+"@typescript-eslint/typescript-estree@4.28.4":
+  version "4.28.4"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.28.4.tgz#252e6863278dc0727244be9e371eb35241c46d00"
+  integrity sha512-z7d8HK8XvCRyN2SNp+OXC2iZaF+O2BTquGhEYLKLx5k6p0r05ureUtgEfo5f6anLkhCxdHtCf6rPM1p4efHYDQ==
+  dependencies:
+    "@typescript-eslint/types" "4.28.4"
+    "@typescript-eslint/visitor-keys" "4.28.4"
+    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 +791,14 @@
     "@typescript-eslint/types" "4.15.0"
     eslint-visitor-keys "^2.0.0"
 
+"@typescript-eslint/visitor-keys@4.28.4":
+  version "4.28.4"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.28.4.tgz#92dacfefccd6751cbb0a964f06683bfd72d0c4d3"
+  integrity sha512-NIAXAdbz1XdOuzqkJHjNKXKj8QQ4cv5cxR/g0uQhCYf/6//XrmfpaYsM7PnBcNbfvTDLUkqQ5TPNm1sozDdTWg==
+  dependencies:
+    "@typescript-eslint/types" "4.28.4"
+    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 +2253,12 @@ 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"
@@ -2596,7 +2629,7 @@ eslint-scope@^4.0.3:
     esrecurse "^4.1.0"
     estraverse "^4.1.1"
 
-eslint-scope@^5.0.0, eslint-scope@^5.1.1:
+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==
@@ -2604,13 +2637,20 @@ eslint-scope@^5.0.0, eslint-scope@^5.1.1:
     esrecurse "^4.3.0"
     estraverse "^4.1.1"
 
-eslint-utils@^2.0.0, eslint-utils@^2.1.0:
+eslint-utils@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/eslint-utils/-/eslint-utils-2.1.0.tgz#d2de5e03424e707dc10c74068ddedae708741b27"
   integrity sha512-w94dQYoauyvlDc43XnGB8lU3Zt713vNChgt4EWwhXAP2XkBvndfxF0AgIqKOOasjPIPzj9JqgwkwbCYD0/V3Zg==
   dependencies:
     eslint-visitor-keys "^1.1.0"
 
+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 "^2.0.0"
+
 eslint-visitor-keys@^1.1.0, eslint-visitor-keys@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.3.0.tgz#30ebd1ef7c2fdff01c3a4f151044af25fab0523e"
@@ -3176,6 +3216,18 @@ 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"
@@ -4508,7 +4560,7 @@ lodash.uniq@^4.5.0:
   resolved "https://registry.yarnpkg.com/lodash.uniq/-/lodash.uniq-4.5.0.tgz#d0225373aeb652adc1bc82e4945339a842754773"
   integrity sha1-0CJTc662Uq3BvILklFM5qEJ1R3M=
 
-lodash@4.x, lodash@^4.17.15, lodash@^4.17.19, lodash@^4.17.20:
+lodash@4.x, lodash@^4.17.19, lodash@^4.17.20:
   version "4.17.20"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.20.tgz#b44a9b6297bcb698f1c51a3545a2b3b368d59c52"
   integrity sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==
@@ -4753,7 +4805,7 @@ 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==
@@ -6070,7 +6122,7 @@ regex-not@^1.0.0, regex-not@^1.0.2:
     extend-shallow "^3.0.2"
     safe-regex "^1.1.0"
 
-regexpp@^3.0.0, regexpp@^3.1.0:
+regexpp@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/regexpp/-/regexpp-3.1.0.tgz#206d0ad0a5648cffbdb8ae46438f3dc51c9f78e2"
   integrity sha512-ZOIzd8yVsQQA7j8GCSlPGXwg5PfmA1mrq0JP4nGhh54LaKN3xdai/vHUDu74pKwV8OxseMS65u2NImosQcSD0Q==
@@ -6320,10 +6372,10 @@ schema-utils@^3.0.0:
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.1.tgz#a954f931aeba508d307bbf069eff0c01c96116f7"
   integrity sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==
 
-semver@7.x, semver@^7.2.1, semver@^7.3.2, semver@^7.3.4:
-  version "7.3.4"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.4.tgz#27aaa7d2e4ca76452f98d3add093a72c943edc97"
-  integrity sha512-tCfb2WLjqFAtXn4KEdxIhalnRtoKFN7nAwj0B3ZXCbQloV2tq5eDbcTmT68JJD3nRJq24/XgxtQKFIpQdtvmVw==
+semver@7.x, semver@^7.2.1, semver@^7.3.2, semver@^7.3.4, 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"
 
@@ -7068,10 +7120,10 @@ tslib@^1.8.1, tslib@^1.9.0:
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.13.0.tgz#c881e13cc7015894ed914862d276436fa9a47043"
   integrity sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==
 
-tsutils@^3.17.1:
-  version "3.17.1"
-  resolved "https://registry.yarnpkg.com/tsutils/-/tsutils-3.17.1.tgz#ed719917f11ca0dee586272b2ac49e015a2dd759"
-  integrity sha512-kzeQ5B8H3w60nFY2g8cJIuH7JDpsALXySGtwGJ0p2LSjLgay3NdIpqq5SoOBe46bKDW2iq25irHCr8wjomUS2g==
+tsutils@^3.17.1, 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"