diff --git a/package-lock.json b/package-lock.json
index ff92e50..938719b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -20,9 +20,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "3.7.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.4.tgz",
-      "integrity": "sha512-A25xv5XCtarLwXpcDNZzCGvW2D1S3/bACratYBx2sax8PefsFhlYmkQicKHvpYflFS8if4zne5zT5kpJ7pzuvw==",
+      "version": "3.9.9",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.9.tgz",
+      "integrity": "sha512-kdMjTiekY+z/ubJCATUPlRDl39vXYiMV9iyeMuEuXZh2we6zz80uovNN2WlAxmmdE/Z/YQe+EbOEXB5RHEED3w==",
       "dev": true
     },
     "typograf": {
diff --git a/package.json b/package.json
index 6a1a845..ba127b1 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "license": "MIT",
   "devDependencies": {
     "@now/node": "1.3.4",
-    "typescript": "3.7.4"
+    "typescript": "3.9.9"
   },
   "dependencies": {
     "typograf": "6.10.0"