diff --git a/package.json b/package.json
index 69b2112e..55261864 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "ts-jest": "^25.3.1",
     "ts-node": "^9.0.0",
     "ttypescript": "^1.5.12",
-    "typescript": "^3.9.7",
+    "typescript": "^3.9.9",
     "typescript-is": "^0.16.3"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 225a1374..83b8d5ca 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3580,10 +3580,10 @@ typescript-is@^0.16.3:
   optionalDependencies:
     reflect-metadata ">=0.1.12"
 
-typescript@^3.9.7:
-  version "3.9.7"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.7.tgz#98d600a5ebdc38f40cb277522f12dc800e9e25fa"
-  integrity sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==
+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==
 
 union-value@^1.0.0:
   version "1.0.1"