diff --git a/example/package.json b/example/package.json
index d2928b92..3c42e7fc 100644
--- a/example/package.json
+++ b/example/package.json
@@ -22,6 +22,6 @@
   "devDependencies": {
     "@babel/core": "7.13.10",
     "parcel-bundler": "1.12.5",
-    "typescript": "3.4.5"
+    "typescript": "4.2.3"
   }
 }
diff --git a/package.json b/package.json
index 02dccd0e..6835c00e 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,6 @@
     "prettier": "1.19.1",
     "renovate-config-nju33": "0.0.1",
     "tslint": "5.20.1",
-    "typescript": "3.4.5"
+    "typescript": "4.2.3"
   }
 }
diff --git a/packages/gsw/package.json b/packages/gsw/package.json
index 22f555d9..bdc5ae1c 100644
--- a/packages/gsw/package.json
+++ b/packages/gsw/package.json
@@ -43,7 +43,7 @@
     "ts-node": "7.0.1",
     "tslint": "5.20.1",
     "typedoc": "0.20.34",
-    "typescript": "3.4.5"
+    "typescript": "4.2.3"
   },
   "keywords": [
     "object"
diff --git a/yarn.lock b/yarn.lock
index 1b84c7ad..1649658c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -11046,10 +11046,10 @@ typedoc-default-themes@^0.12.9:
   resolved "https://registry.yarnpkg.com/typedoc-default-themes/-/typedoc-default-themes-0.12.9.tgz#97dfecb74faca36f8aff81d3be984b095d2bbbd8"
   integrity sha512-Jd5fYTiqzinZdoIY382W7tQXTwAzWRdg8KbHfaxmb78m1/3jL9riXtk23oBOKwhi8GFVykCOdPzEJKY87/D0LQ==
 
-typedoc@0.20.31:
-  version "0.20.31"
-  resolved "https://registry.yarnpkg.com/typedoc/-/typedoc-0.20.31.tgz#4439cc637d31497c7696f46b1e52ac7ac3ee8ade"
-  integrity sha512-36ADb6bdzmnGde6H3dlyMmof0y0ryRvSOhYh96bJHcYdJKipf5Ir4uduj+mZfshd8ktCGlLg48LfNTAE9PpIrQ==
+typedoc@0.20.34:
+  version "0.20.34"
+  resolved "https://registry.yarnpkg.com/typedoc/-/typedoc-0.20.34.tgz#763c4e1ebef55fd4f71a27f0f02249926107021a"
+  integrity sha512-es+N/KyGPcHl9cAuYh1Z5m7HzwcmfNLghkmb2pzGz7HRDS5GS2uA3hu/c2cv4gCxDsw8pPUPCOvww+Hzf48Kug==
   dependencies:
     colors "^1.4.0"
     fs-extra "^9.1.0"
@@ -11063,10 +11063,10 @@ typedoc@0.20.31:
     shiki "^0.9.3"
     typedoc-default-themes "^0.12.9"
 
-typescript@3.4.5:
-  version "3.4.5"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.5.tgz#2d2618d10bb566572b8d7aad5180d84257d70a99"
-  integrity sha512-YycBxUb49UUhdNMU5aJ7z5Ej2XGmaIBL0x34vZ82fn3hGvD+bgrMrVDpatgz2f7YxUMJxMkbWxJZeAvDxVe7Vw==
+typescript@4.2.3:
+  version "4.2.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.3.tgz#39062d8019912d43726298f09493d598048c1ce3"
+  integrity sha512-qOcYwxaByStAWrBf4x0fibwZvMRG+r4cQoTjbPtUlrWjBHbmCAww1i448U0GJ+3cNNEtebDteo/cHOR3xJ4wEw==
 
 uglify-js@^3.1.4:
   version "3.4.9"