diff --git a/mock_server/package-lock.json b/mock_server/package-lock.json
index 8a9b760..6090c1f 100644
--- a/mock_server/package-lock.json
+++ b/mock_server/package-lock.json
@@ -9,7 +9,7 @@
       "version": "1.0.1",
       "license": "ISC",
       "dependencies": {
-        "lodash": "^4.17.21"
+        "lodash": "^4.18.1"
       },
       "devDependencies": {
         "json-server": "^1.0.0-alpha.23"
@@ -509,9 +509,9 @@
       }
     },
     "node_modules/lodash": {
-      "version": "4.17.21",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
-      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
+      "version": "4.18.1",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.18.1.tgz",
+      "integrity": "sha512-dMInicTPVE8d1e5otfwmmjlxkZoUpiVLwyeTdUsi/Caj/gfzzblBcCE5sRHV/AsjuCmxWrte2TNGSYuCeCq+0Q=="
     },
     "node_modules/lowdb": {
       "version": "7.0.1",
@@ -1022,9 +1022,9 @@
       "dev": true
     },
     "lodash": {
-      "version": "4.17.21",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
-      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
+      "version": "4.18.1",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.18.1.tgz",
+      "integrity": "sha512-dMInicTPVE8d1e5otfwmmjlxkZoUpiVLwyeTdUsi/Caj/gfzzblBcCE5sRHV/AsjuCmxWrte2TNGSYuCeCq+0Q=="
     },
     "lowdb": {
       "version": "7.0.1",
diff --git a/mock_server/package.json b/mock_server/package.json
index f3e682e..0208e60 100644
--- a/mock_server/package.json
+++ b/mock_server/package.json
@@ -7,7 +7,7 @@
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "dependencies": {
-    "lodash": "^4.17.21"
+    "lodash": "^4.18.1"
   },
   "author": "fumiyasac(Fumiya Sakai)",
   "license": "ISC",