diff --git a/package-lock.json b/package-lock.json
index e5c3e53..e2c4b02 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,9 +41,9 @@
       "dev": true
     },
     "@types/power-assert": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/@types/power-assert/-/power-assert-1.5.0.tgz",
-      "integrity": "sha512-KPoeO2vSMGOOL1g8p/d7mvTTz7SCW7RRcpavqxhFwKZoqsDd1nwPGE9QICIt50b348/9MJYuBdwjUK34Y09XJw==",
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/@types/power-assert/-/power-assert-1.5.1.tgz",
+      "integrity": "sha512-NRRMdFUYJ09pGUArK4zJhZZWDdP6r1fbp83zfcC3jT5vv1DGKpLrE4NgqkDfToP4X4kaB9wMwPnfxJD+0yz1ag==",
       "dev": true,
       "requires": {
         "@types/empower": "*",
diff --git a/package.json b/package.json
index f63a395..cdd7b3b 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "devDependencies": {
     "@types/mocha": "^5.2.7",
     "@types/node": "^11.11.6",
-    "@types/power-assert": "^1.5.0",
+    "@types/power-assert": "^1.5.1",
     "espower-typescript": "^9.0.0",
     "get-port": "^5.0.0",
     "mocha": "^6.2.1",