diff --git a/package.json b/package.json
index d742a70a..5f3c70ef 100644
--- a/package.json
+++ b/package.json
@@ -95,7 +95,7 @@
     "source-map-support": "^0.5.16",
     "ts-node": "^8.6.2",
     "tsconfig-paths": "^3.9.0",
-    "typescript": "3.8.3",
+    "typescript": "3.9.9",
     "universal-ledger-agent": "^0.1.2"
   },
   "dependencies": {
diff --git a/yarn.lock b/yarn.lock
index a56e8a1a..76bba9d6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7445,10 +7445,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@3.8.3, typescript@^3.6.3:
-  version "3.8.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.8.3.tgz#409eb8544ea0335711205869ec458ab109ee1061"
-  integrity sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==
+typescript@3.9.9, typescript@^3.6.3:
+  version "3.9.9"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.9.tgz#e69905c54bc0681d0518bd4d587cc6f2d0b1a674"
+  integrity sha512-kdMjTiekY+z/ubJCATUPlRDl39vXYiMV9iyeMuEuXZh2we6zz80uovNN2WlAxmmdE/Z/YQe+EbOEXB5RHEED3w==
 
 uglify-js@^3.1.4:
   version "3.13.5"