diff --git a/package.json b/package.json
index c2c3e24..a930fea 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "@types/showdown": "^1.9.3",
     "@typescript-eslint/eslint-plugin": "^4.23.0",
     "@typescript-eslint/parser": "^4.24.0",
-    "babel-jest": "^26.6.3",
+    "babel-jest": "^27.3.1",
     "eslint": "^7.26.0",
     "eslint-config-airbnb-base": "^14.2.1",
     "eslint-config-prettier": "^8.3.0",
diff --git a/yarn.lock b/yarn.lock
index 735e8b3..eabc655 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1208,6 +1208,27 @@
     source-map "^0.6.1"
     write-file-atomic "^3.0.0"
 
+"@jest/transform@^27.3.1":
+  version "27.3.1"
+  resolved "https://registry.yarnpkg.com/@jest/transform/-/transform-27.3.1.tgz#ff80eafbeabe811e9025e4b6f452126718455220"
+  integrity sha512-3fSvQ02kuvjOI1C1ssqMVBKJpZf6nwoCiSu00zAKh5nrp3SptNtZy/8s5deayHnqxhjD9CWDJ+yqQwuQ0ZafXQ==
+  dependencies:
+    "@babel/core" "^7.1.0"
+    "@jest/types" "^27.2.5"
+    babel-plugin-istanbul "^6.0.0"
+    chalk "^4.0.0"
+    convert-source-map "^1.4.0"
+    fast-json-stable-stringify "^2.0.0"
+    graceful-fs "^4.2.4"
+    jest-haste-map "^27.3.1"
+    jest-regex-util "^27.0.6"
+    jest-util "^27.3.1"
+    micromatch "^4.0.4"
+    pirates "^4.0.1"
+    slash "^3.0.0"
+    source-map "^0.6.1"
+    write-file-atomic "^3.0.0"
+
 "@jest/types@^26.6.2":
   version "26.6.2"
   resolved "https://registry.yarnpkg.com/@jest/types/-/types-26.6.2.tgz#bef5a532030e1d88a2f5a6d933f84e97226ed48e"
@@ -1219,6 +1240,17 @@
     "@types/yargs" "^15.0.0"
     chalk "^4.0.0"
 
+"@jest/types@^27.2.5":
+  version "27.2.5"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-27.2.5.tgz#420765c052605e75686982d24b061b4cbba22132"
+  integrity sha512-nmuM4VuDtCZcY+eTpw+0nvstwReMsjPoj7ZR80/BbixulhLaiX+fbv8oeLW8WZlJMcsGQsTmMKT/iTZu1Uy/lQ==
+  dependencies:
+    "@types/istanbul-lib-coverage" "^2.0.0"
+    "@types/istanbul-reports" "^3.0.0"
+    "@types/node" "*"
+    "@types/yargs" "^16.0.0"
+    chalk "^4.0.0"
+
 "@nodelib/fs.scandir@2.1.4":
   version "2.1.4"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.4.tgz#d4b3549a5db5de2683e0c1071ab4f140904bbf69"
@@ -1254,10 +1286,10 @@
   dependencies:
     "@sinonjs/commons" "^1.7.0"
 
-"@types/babel__core@^7.0.0", "@types/babel__core@^7.1.7":
-  version "7.1.12"
-  resolved "https://registry.yarnpkg.com/@types/babel__core/-/babel__core-7.1.12.tgz#4d8e9e51eb265552a7e4f1ff2219ab6133bdfb2d"
-  integrity sha512-wMTHiiTiBAAPebqaPiPDLFA4LYPKr6Ph0Xq/6rq1Ur3v66HXyG+clfR9CNETkD7MQS8ZHvpQOtA53DLws5WAEQ==
+"@types/babel__core@^7.0.0", "@types/babel__core@^7.1.14", "@types/babel__core@^7.1.7":
+  version "7.1.16"
+  resolved "https://registry.yarnpkg.com/@types/babel__core/-/babel__core-7.1.16.tgz#bc12c74b7d65e82d29876b5d0baf5c625ac58702"
+  integrity sha512-EAEHtisTMM+KaKwfWdC3oyllIqswlznXCIVCt7/oRNrh+DhgT4UEBNC/jlADNjvw7UnfbcdkGQcPVZ1xYiLcrQ==
   dependencies:
     "@babel/parser" "^7.1.0"
     "@babel/types" "^7.0.0"
@@ -1419,6 +1451,13 @@
   dependencies:
     "@types/yargs-parser" "*"
 
+"@types/yargs@^16.0.0":
+  version "16.0.4"
+  resolved "https://registry.yarnpkg.com/@types/yargs/-/yargs-16.0.4.tgz#26aad98dd2c2a38e421086ea9ad42b9e51642977"
+  integrity sha512-T8Yc9wt/5LbJyCaLiHPReJa0kApcIgJ7Bn735GjItUfh08Z1pJvu8QZqb9s+mMvKV6WUQRV7K2R46YbjMXTTJw==
+  dependencies:
+    "@types/yargs-parser" "*"
+
 "@typescript-eslint/eslint-plugin@^4.23.0":
   version "4.23.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.23.0.tgz#29d3c9c81f6200b1fd6d8454cfb007ba176cde80"
@@ -1897,6 +1936,20 @@ babel-jest@^26.6.3:
     graceful-fs "^4.2.4"
     slash "^3.0.0"
 
+babel-jest@^27.3.1:
+  version "27.3.1"
+  resolved "https://registry.yarnpkg.com/babel-jest/-/babel-jest-27.3.1.tgz#0636a3404c68e07001e434ac4956d82da8a80022"
+  integrity sha512-SjIF8hh/ir0peae2D6S6ZKRhUy7q/DnpH7k/V6fT4Bgs/LXXUztOpX4G2tCgq8mLo5HA9mN6NmlFMeYtKmIsTQ==
+  dependencies:
+    "@jest/transform" "^27.3.1"
+    "@jest/types" "^27.2.5"
+    "@types/babel__core" "^7.1.14"
+    babel-plugin-istanbul "^6.0.0"
+    babel-preset-jest "^27.2.0"
+    chalk "^4.0.0"
+    graceful-fs "^4.2.4"
+    slash "^3.0.0"
+
 babel-plugin-dynamic-import-node@^2.3.3:
   version "2.3.3"
   resolved "https://registry.yarnpkg.com/babel-plugin-dynamic-import-node/-/babel-plugin-dynamic-import-node-2.3.3.tgz#84fda19c976ec5c6defef57f9427b3def66e17a3"
@@ -1925,6 +1978,16 @@ babel-plugin-jest-hoist@^26.6.2:
     "@types/babel__core" "^7.0.0"
     "@types/babel__traverse" "^7.0.6"
 
+babel-plugin-jest-hoist@^27.2.0:
+  version "27.2.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-jest-hoist/-/babel-plugin-jest-hoist-27.2.0.tgz#79f37d43f7e5c4fdc4b2ca3e10cc6cf545626277"
+  integrity sha512-TOux9khNKdi64mW+0OIhcmbAn75tTlzKhxmiNXevQaPbrBYK7YKjP1jl6NHTJ6XR5UgUrJbCnWlKVnJn29dfjw==
+  dependencies:
+    "@babel/template" "^7.3.3"
+    "@babel/types" "^7.3.3"
+    "@types/babel__core" "^7.0.0"
+    "@types/babel__traverse" "^7.0.6"
+
 babel-plugin-polyfill-corejs2@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-polyfill-corejs2/-/babel-plugin-polyfill-corejs2-0.2.0.tgz#686775bf9a5aa757e10520903675e3889caeedc4"
@@ -1975,6 +2038,14 @@ babel-preset-jest@^26.6.2:
     babel-plugin-jest-hoist "^26.6.2"
     babel-preset-current-node-syntax "^1.0.0"
 
+babel-preset-jest@^27.2.0:
+  version "27.2.0"
+  resolved "https://registry.yarnpkg.com/babel-preset-jest/-/babel-preset-jest-27.2.0.tgz#556bbbf340608fed5670ab0ea0c8ef2449fba885"
+  integrity sha512-z7MgQ3peBwN5L5aCqBKnF6iqdlvZvFUQynEhu0J+X9nHLU72jO3iY331lcYrg+AssJ8q7xsv5/3AICzVmJ/wvg==
+  dependencies:
+    babel-plugin-jest-hoist "^27.2.0"
+    babel-preset-current-node-syntax "^1.0.0"
+
 balanced-match@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
@@ -2169,6 +2240,11 @@ ci-info@^2.0.0:
   resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-2.0.0.tgz#67a9e964be31a51e15e5010d58e6f12834002f46"
   integrity sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==
 
+ci-info@^3.2.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-3.2.0.tgz#2876cb948a498797b5236f0095bc057d0dca38b6"
+  integrity sha512-dVqRX7fLUm8J6FgHJ418XuIgDLZDkYcDFTeL6TA2gt5WlIZUQrrH6EZrNClwT/H0FateUsZkGIOPRrLbP+PR9A==
+
 cjs-module-lexer@^0.6.0:
   version "0.6.0"
   resolved "https://registry.yarnpkg.com/cjs-module-lexer/-/cjs-module-lexer-0.6.0.tgz#4186fcca0eae175970aee870b9fe2d6cf8d5655f"
@@ -3151,7 +3227,7 @@ fs.realpath@^1.0.0:
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
   integrity sha1-FQStJSMVjKpA20onh8sBQRmU6k8=
 
-fsevents@^2.1.2:
+fsevents@^2.1.2, fsevents@^2.3.2:
   version "2.3.2"
   resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.3.2.tgz#8a526f78b8fdf4623b709e0b975c52c24c02fd1a"
   integrity sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==
@@ -3920,6 +3996,26 @@ jest-haste-map@^26.6.2:
   optionalDependencies:
     fsevents "^2.1.2"
 
+jest-haste-map@^27.3.1:
+  version "27.3.1"
+  resolved "https://registry.yarnpkg.com/jest-haste-map/-/jest-haste-map-27.3.1.tgz#7656fbd64bf48bda904e759fc9d93e2c807353ee"
+  integrity sha512-lYfNZIzwPccDJZIyk9Iz5iQMM/MH56NIIcGj7AFU1YyA4ewWFBl8z+YPJuSCRML/ee2cCt2y3W4K3VXPT6Nhzg==
+  dependencies:
+    "@jest/types" "^27.2.5"
+    "@types/graceful-fs" "^4.1.2"
+    "@types/node" "*"
+    anymatch "^3.0.3"
+    fb-watchman "^2.0.0"
+    graceful-fs "^4.2.4"
+    jest-regex-util "^27.0.6"
+    jest-serializer "^27.0.6"
+    jest-util "^27.3.1"
+    jest-worker "^27.3.1"
+    micromatch "^4.0.4"
+    walker "^1.0.7"
+  optionalDependencies:
+    fsevents "^2.3.2"
+
 jest-jasmine2@^26.6.3:
   version "26.6.3"
   resolved "https://registry.yarnpkg.com/jest-jasmine2/-/jest-jasmine2-26.6.3.tgz#adc3cf915deacb5212c93b9f3547cd12958f2edd"
@@ -3995,6 +4091,11 @@ jest-regex-util@^26.0.0:
   resolved "https://registry.yarnpkg.com/jest-regex-util/-/jest-regex-util-26.0.0.tgz#d25e7184b36e39fd466c3bc41be0971e821fee28"
   integrity sha512-Gv3ZIs/nA48/Zvjrl34bf+oD76JHiGDUxNOVgUjh3j890sblXryjY4rss71fPtD/njchl6PSE2hIhvyWa1eT0A==
 
+jest-regex-util@^27.0.6:
+  version "27.0.6"
+  resolved "https://registry.yarnpkg.com/jest-regex-util/-/jest-regex-util-27.0.6.tgz#02e112082935ae949ce5d13b2675db3d8c87d9c5"
+  integrity sha512-SUhPzBsGa1IKm8hx2F4NfTGGp+r7BXJ4CulsZ1k2kI+mGLG+lxGrs76veN2LF/aUdGosJBzKgXmNCw+BzFqBDQ==
+
 jest-resolve-dependencies@^26.6.3:
   version "26.6.3"
   resolved "https://registry.yarnpkg.com/jest-resolve-dependencies/-/jest-resolve-dependencies-26.6.3.tgz#6680859ee5d22ee5dcd961fe4871f59f4c784fb6"
@@ -4085,6 +4186,14 @@ jest-serializer@^26.6.2:
     "@types/node" "*"
     graceful-fs "^4.2.4"
 
+jest-serializer@^27.0.6:
+  version "27.0.6"
+  resolved "https://registry.yarnpkg.com/jest-serializer/-/jest-serializer-27.0.6.tgz#93a6c74e0132b81a2d54623251c46c498bb5bec1"
+  integrity sha512-PtGdVK9EGC7dsaziskfqaAPib6wTViY3G8E5wz9tLVPhHyiDNTZn/xjZ4khAw+09QkoOVpn7vF5nPSN6dtBexA==
+  dependencies:
+    "@types/node" "*"
+    graceful-fs "^4.2.4"
+
 jest-snapshot@^26.6.2:
   version "26.6.2"
   resolved "https://registry.yarnpkg.com/jest-snapshot/-/jest-snapshot-26.6.2.tgz#f3b0af1acb223316850bd14e1beea9837fb39c84"
@@ -4119,6 +4228,18 @@ jest-util@^26.6.2:
     is-ci "^2.0.0"
     micromatch "^4.0.2"
 
+jest-util@^27.3.1:
+  version "27.3.1"
+  resolved "https://registry.yarnpkg.com/jest-util/-/jest-util-27.3.1.tgz#a58cdc7b6c8a560caac9ed6bdfc4e4ff23f80429"
+  integrity sha512-8fg+ifEH3GDryLQf/eKZck1DEs2YuVPBCMOaHQxVVLmQwl/CDhWzrvChTX4efLZxGrw+AA0mSXv78cyytBt/uw==
+  dependencies:
+    "@jest/types" "^27.2.5"
+    "@types/node" "*"
+    chalk "^4.0.0"
+    ci-info "^3.2.0"
+    graceful-fs "^4.2.4"
+    picomatch "^2.2.3"
+
 jest-validate@^26.6.2:
   version "26.6.2"
   resolved "https://registry.yarnpkg.com/jest-validate/-/jest-validate-26.6.2.tgz#23d380971587150467342911c3d7b4ac57ab20ec"
@@ -4153,6 +4274,15 @@ jest-worker@^26.6.2:
     merge-stream "^2.0.0"
     supports-color "^7.0.0"
 
+jest-worker@^27.3.1:
+  version "27.3.1"
+  resolved "https://registry.yarnpkg.com/jest-worker/-/jest-worker-27.3.1.tgz#0def7feae5b8042be38479799aeb7b5facac24b2"
+  integrity sha512-ks3WCzsiZaOPJl/oMsDjaf0TRiSv7ctNgs0FqRr2nARsovz6AWWy4oLElwcquGSz692DzgZQrCLScPNs5YlC4g==
+  dependencies:
+    "@types/node" "*"
+    merge-stream "^2.0.0"
+    supports-color "^8.0.0"
+
 jest@^26.6.3:
   version "26.6.3"
   resolved "https://registry.yarnpkg.com/jest/-/jest-26.6.3.tgz#40e8fdbe48f00dfa1f0ce8121ca74b88ac9148ef"
@@ -5828,6 +5958,13 @@ supports-color@^7.0.0, supports-color@^7.1.0:
   dependencies:
     has-flag "^4.0.0"
 
+supports-color@^8.0.0:
+  version "8.1.1"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-8.1.1.tgz#cd6fc17e28500cff56c1b86c0a7fd4a54a73005c"
+  integrity sha512-MpUEN2OodtUzxvKQl72cUF7RQ5EiHsGvSsVG0ia9c5RbWGL2CI4C7EpPS8UTBIplnlzZiNuV56w+FuNxy3ty2Q==
+  dependencies:
+    has-flag "^4.0.0"
+
 supports-hyperlinks@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/supports-hyperlinks/-/supports-hyperlinks-2.1.0.tgz#f663df252af5f37c5d49bbd7eeefa9e0b9e59e47"