diff --git a/package-lock.json b/package-lock.json
index ffa63af..f8a1f18 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,7 +25,7 @@
         "ts-node": "^9.0.0",
         "tslint": "^5.9.1",
         "tslint-config-airbnb": "^5.8.0",
-        "typescript": "^3.1.6"
+        "typescript": "^4.3.5"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -1502,9 +1502,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "3.9.7",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.7.tgz",
-      "integrity": "sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==",
+      "version": "4.3.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.5.tgz",
+      "integrity": "sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==",
       "dev": true,
       "bin": {
         "tsc": "bin/tsc",
@@ -3024,9 +3024,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "3.9.7",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.7.tgz",
-      "integrity": "sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==",
+      "version": "4.3.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.5.tgz",
+      "integrity": "sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==",
       "dev": true
     },
     "which": {
diff --git a/package.json b/package.json
index a4a39d5..055427a 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "ts-node": "^9.0.0",
     "tslint": "^5.9.1",
     "tslint-config-airbnb": "^5.8.0",
-    "typescript": "^3.1.6"
+    "typescript": "^4.3.5"
   },
   "dependencies": {
     "@lapo/asn1js": "1.1.x",