diff --git a/package.json b/package.json
index e49d5de4..e280255d 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "prettier": "1.19.1",
     "renovate-config-nju33": "0.0.1",
     "ts-jest": "24.3.0",
-    "typescript": "3.9.10"
+    "typescript": "4.4.2"
   },
   "dependencies": {}
 }
diff --git a/packages/core-dayo/package.json b/packages/core-dayo/package.json
index 637807b3..e5775201 100644
--- a/packages/core-dayo/package.json
+++ b/packages/core-dayo/package.json
@@ -21,7 +21,7 @@
     "@types/nanoevents": "1.0.0",
     "@types/nanoid": "2.1.0",
     "npm-run-all": "4.1.5",
-    "typescript": "3.9.10"
+    "typescript": "4.4.2"
   },
   "dependencies": {
     "iryo": "^0.0.2",
diff --git a/packages/react-dayo/package.json b/packages/react-dayo/package.json
index a7ab2a4f..65265584 100644
--- a/packages/react-dayo/package.json
+++ b/packages/react-dayo/package.json
@@ -50,7 +50,7 @@
     "styled-components": "4.4.1",
     "ts-jest": "24.3.0",
     "typedoc": "0.20.36",
-    "typescript": "3.9.10"
+    "typescript": "4.4.2"
   },
   "dependencies": {
     "core-dayo": "^0.3.6-alpha.0",
diff --git a/yarn.lock b/yarn.lock
index 5fcf8928..243986b1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9669,10 +9669,10 @@ typescript@3.5.1:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.5.1.tgz#ba72a6a600b2158139c5dd8850f700e231464202"
   integrity sha512-64HkdiRv1yYZsSe4xC1WVgamNigVYjlssIoaH2HcZF0+ijsk5YK2g0G34w9wJkze8+5ow4STd22AynfO6ZYYLw==
 
-typescript@3.9.10:
-  version "3.9.10"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.10.tgz#70f3910ac7a51ed6bef79da7800690b19bf778b8"
-  integrity sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q==
+typescript@4.4.2:
+  version "4.4.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.4.2.tgz#6d618640d430e3569a1dfb44f7d7e600ced3ee86"
+  integrity sha512-gzP+t5W4hdy4c+68bfcv0t400HVJMMd2+H9B7gae1nQlBzCqvrXX+6GL/b3GAgyTH966pzrZ70/fRjwAtZksSQ==
 
 uglify-js@^3.1.4:
   version "3.6.0"