diff --git a/package-lock.json b/package-lock.json
index 7b307a7..97854da 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "@types/lodash": "^4.14.104",
-        "lodash": "^4.17.5",
+        "lodash": "^4.17.21",
         "ts-deepmerge": "^2.0.1"
       },
       "devDependencies": {
diff --git a/package.json b/package.json
index b0d7628..1beab8e 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
   "homepage": "https://github.com/firebase/firebase-functions-test#readme",
   "dependencies": {
     "@types/lodash": "^4.14.104",
-    "lodash": "^4.17.5",
+    "lodash": "^4.17.21",
     "ts-deepmerge": "^2.0.1"
   },
   "devDependencies": {