diff --git a/package-lock.json b/package-lock.json
index e7ef5f20..09663e01 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -140,9 +140,9 @@
       "dev": true
     },
     "@types/react": {
-      "version": "16.9.19",
-      "resolved": "https://registry.npmjs.org/@types/react/-/react-16.9.19.tgz",
-      "integrity": "sha512-LJV97//H+zqKWMms0kvxaKYJDG05U2TtQB3chRLF8MPNs+MQh/H1aGlyDUxjaHvu08EAGerdX2z4LTBc7ns77A==",
+      "version": "16.9.20",
+      "resolved": "https://registry.npmjs.org/@types/react/-/react-16.9.20.tgz",
+      "integrity": "sha512-jRrWBr25zzEVNa4QbESKLPluvrZ3W6Odfwrfe2F5vzbrDuNvlpnHa/xbZcXg8RH5D4CE181J5VxrRrLvzRH+5A==",
       "dev": true,
       "requires": {
         "@types/prop-types": "*",
@@ -852,9 +852,9 @@
       }
     },
     "csstype": {
-      "version": "2.6.8",
-      "resolved": "https://registry.npmjs.org/csstype/-/csstype-2.6.8.tgz",
-      "integrity": "sha512-msVS9qTuMT5zwAGCVm4mxfrZ18BNc6Csd0oJAtiFMZ1FAx1CCvy2+5MDmYoix63LM/6NDbNtodCiGYGmFgO0dA==",
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/csstype/-/csstype-2.6.9.tgz",
+      "integrity": "sha512-xz39Sb4+OaTsULgUERcCk+TJj8ylkL4aSVDQiX/ksxbELSqwkgt4d4RD7fovIdgJGSuNYqwZEiVjYY5l0ask+Q==",
       "dev": true
     },
     "currently-unhandled": {
diff --git a/package.json b/package.json
index 42cb9912..ddb088dd 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
   "author": "cybozu",
   "license": "MIT",
   "devDependencies": {
-    "@types/react": "^16.9.19",
+    "@types/react": "^16.9.20",
     "eslint": "^6.8.0",
     "mocha": "^7.0.1",
     "npm-run-all": "^4.1.5",