diff --git a/package.json b/package.json
index 973f60a..25417e2 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "jest": "^25.5.4",
     "ts-jest": "^25.5.1",
     "tslint": "^6.1.2",
-    "typescript": "^3.9.5"
+    "typescript": "^3.9.9"
   },
   "engines": {
     "node": "10.* || >= 12.*"
diff --git a/yarn.lock b/yarn.lock
index 44eb251..6446997 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3207,9 +3207,9 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@^3.9.5:
-  version "3.9.5"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.5.tgz#586f0dba300cde8be52dd1ac4f7e1009c1b13f36"
+typescript@^3.9.9:
+  version "3.9.9"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.9.tgz#e69905c54bc0681d0518bd4d587cc6f2d0b1a674"
 
 union-value@^1.0.0:
   version "1.0.0"