diff --git a/package.json b/package.json
index c7c9f4f..bd938fa 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "devDependencies": {
         "rimraf": "2.6.3",
         "tslint": "5.12.1",
-        "typescript": "3.2.4"
+        "typescript": "3.9.9"
     },
     "dependencies": {
         "@types/node": "^10.0.0"
diff --git a/yarn.lock b/yarn.lock
index 4cf2855..4f3023b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -242,9 +242,10 @@ tsutils@^2.27.2:
   dependencies:
     tslib "^1.8.1"
 
-typescript@3.2.4:
-  version "3.2.4"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.2.4.tgz#c585cb952912263d915b462726ce244ba510ef3d"
+typescript@3.9.9:
+  version "3.9.9"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.9.tgz#e69905c54bc0681d0518bd4d587cc6f2d0b1a674"
+  integrity sha512-kdMjTiekY+z/ubJCATUPlRDl39vXYiMV9iyeMuEuXZh2we6zz80uovNN2WlAxmmdE/Z/YQe+EbOEXB5RHEED3w==
 
 wrappy@1:
   version "1.0.2"