diff --git a/package-lock.json b/package-lock.json
index 669b1f7..d3b7c1f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2316,9 +2316,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.19",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.19.tgz",
-      "integrity": "sha512-JNvd8XER9GQX0v2qJgsaN/mzFCNA5BRe/j8JN9d+tWyGLSodKQHKFicdwNYzWwI3wjRnaKPsGj1XkBjx/F96DQ=="
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
     },
     "lodash._reinterpolate": {
       "version": "3.0.0",
diff --git a/package.json b/package.json
index 203fb3a..1bd3680 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "koa-router": "^7.2.1",
     "linebot": "^1.3.0",
     "linebot-koa-middleware": "0.0.1",
-    "lodash": "^4.17.19",
+    "lodash": "^4.17.21",
     "moment": "^2.20.1",
     "node-schedule": "^1.3.0",
     "request": "^2.83.0"