diff --git a/package.json b/package.json
index 38fd8df..b0c3568 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "remark-stringify": "7.0.4",
     "source-map-support": "0.5.11",
     "ts-node": "8.1.1",
-    "typescript": "3.3.3333",
+    "typescript": "4.0.5",
     "unified": "7.1.0"
   },
   "dependencies": {
diff --git a/yarn.lock b/yarn.lock
index 49e95fa..8ce0c11 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6857,10 +6857,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@3.3.3333:
-  version "3.3.3333"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.3.3333.tgz#171b2c5af66c59e9431199117a3bcadc66fdcfd6"
-  integrity sha512-JjSKsAfuHBE/fB2oZ8NxtRTk5iGcg6hkYXMnZ3Wc+b2RSqejEqTaem11mHASMnFilHrax3sLK0GDzcJrekZYLw==
+typescript@4.0.5:
+  version "4.0.5"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.0.5.tgz#ae9dddfd1069f1cb5beb3ef3b2170dd7c1332389"
+  integrity sha512-ywmr/VrTVCmNTJ6iV2LwIrfG1P+lv6luD8sUJs+2eI9NLGigaN+nUQc13iHqisq7bra9lnmUSYqbJvegraBOPQ==
 
 uglify-js@^3.1.4:
   version "3.6.7"