diff --git a/typescript/package-lock.json b/typescript/package-lock.json
index 11306ba..81ccb64 100644
--- a/typescript/package-lock.json
+++ b/typescript/package-lock.json
@@ -13,7 +13,8 @@
     "@types/lodash": {
       "version": "4.14.86",
       "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.86.tgz",
-      "integrity": "sha512-DIiC7xZkI+iqwb6A28+JDfrioxcFRHAUXl+AEZ9lULQppiArWRfex4ugVUAJKZHxcgqZJ1w2de2DTahVyrEp4Q=="
+      "integrity": "sha512-DIiC7xZkI+iqwb6A28+JDfrioxcFRHAUXl+AEZ9lULQppiArWRfex4ugVUAJKZHxcgqZJ1w2de2DTahVyrEp4Q==",
+      "dev": true
     },
     "@types/mocha": {
       "version": "2.2.44",
@@ -222,9 +223,9 @@
       "dev": true
     },
     "lodash": {
-      "version": "4.17.4",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
-      "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4="
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
     },
     "make-error": {
       "version": "1.3.0",
diff --git a/typescript/package.json b/typescript/package.json
index 588bd5c..449c273 100644
--- a/typescript/package.json
+++ b/typescript/package.json
@@ -31,6 +31,6 @@
     "typescript": "^2.6.2"
   },
   "dependencies": {
-    "lodash": "^4.17.4"
+    "lodash": "^4.17.21"
   }
 }