diff --git a/.nvmrc b/.nvmrc
index 48082f7..8351c19 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-12
+14
diff --git a/package.json b/package.json
index 796b0a0..20fa825 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,8 @@
     "events": "^3.2.0",
     "microtime": "^3.0.0",
     "mocha": "^8.2.1",
-    "sinon": "^9.2.4"
+    "sinon": "^9.2.4",
+    "typescript": "^4.1.4"
   },
   "dependencies": {
     "bcrypto": "^5.4.0",
diff --git a/yarn.lock b/yarn.lock
index 5e24630..8d14d89 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -592,6 +592,21 @@
   resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.15.tgz#b7a6d263c2cecf44b6de9a051cf496249b154553"
   integrity sha512-rYff6FI+ZTKAPkJUoyz7Udq3GaoDZnxYDEvdEdFZASiA7PoErltHezDishqQiSDWrGxvxmplH304jyzQmjp0AQ==
 
+"@types/component-emitter@^1.2.10":
+  version "1.2.10"
+  resolved "https://registry.yarnpkg.com/@types/component-emitter/-/component-emitter-1.2.10.tgz#ef5b1589b9f16544642e473db5ea5639107ef3ea"
+  integrity sha512-bsjleuRKWmGqajMerkzox19aGbscQX5rmmvvXl3wlIp5gMG1HgkiwPxsN5p070fBDKTNSPgojVbuY1+HWMbFhg==
+
+"@types/cookie@^0.4.0":
+  version "0.4.0"
+  resolved "https://registry.yarnpkg.com/@types/cookie/-/cookie-0.4.0.tgz#14f854c0f93d326e39da6e3b6f34f7d37513d108"
+  integrity sha512-y7mImlc/rNkvCRmg8gC3/lj87S7pTUIJ6QGjwHR9WQJcFs+ZMTOaoPrkdFA/YdbuqVEmEbb5RdhVxMkAcgOnpg==
+
+"@types/cors@^2.8.8":
+  version "2.8.9"
+  resolved "https://registry.yarnpkg.com/@types/cors/-/cors-2.8.9.tgz#4bd1fcac72eca8d5bec93e76c7fdcbdc1bc2cd4a"
+  integrity sha512-zurD1ibz21BRlAOIKP8yhrxlqKx6L9VCwkB5kMiP6nZAhoF5MvC7qS1qPA7nRcr1GJolfkQC7/EAL4hdYejLtg==
+
 "@types/dirty-chai@^2.0.2":
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/@types/dirty-chai/-/dirty-chai-2.0.2.tgz#eeac4802329a41ed7815ac0c1a6360335bf77d0c"
@@ -1892,7 +1907,7 @@ core-util-is@~1.0.0:
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
   integrity sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=
 
-cors@^2.8.5:
+cors@^2.8.5, cors@~2.8.5:
   version "2.8.5"
   resolved "https://registry.yarnpkg.com/cors/-/cors-2.8.5.tgz#eac11da51592dd86b9f06f6e7ac293b3df875d29"
   integrity sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==
@@ -4712,6 +4727,11 @@ native-abort-controller@^1.0.3:
   resolved "https://registry.yarnpkg.com/native-abort-controller/-/native-abort-controller-1.0.3.tgz#35974a2e189c0d91399c8767a989a5bf058c1435"
   integrity sha512-fd5LY5q06mHKZPD5FmMrn7Lkd2H018oBGKNOAdLpctBDEPFKsfJ1nX9ke+XRa8PEJJpjqrpQkGjq2IZ27QNmYA==
 
+native-abort-controller@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/native-abort-controller/-/native-abort-controller-1.0.3.tgz#35974a2e189c0d91399c8767a989a5bf058c1435"
+  integrity sha512-fd5LY5q06mHKZPD5FmMrn7Lkd2H018oBGKNOAdLpctBDEPFKsfJ1nX9ke+XRa8PEJJpjqrpQkGjq2IZ27QNmYA==
+
 native-fetch@2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/native-fetch/-/native-fetch-2.0.1.tgz#319d53741a7040def92d5dc8ea5fe9416b1fad89"