diff --git a/aws-node-fullstack/backend/package-lock.json b/aws-node-fullstack/backend/package-lock.json
index 459125bdd..9e5e3ac20 100644
--- a/aws-node-fullstack/backend/package-lock.json
+++ b/aws-node-fullstack/backend/package-lock.json
@@ -332,6 +332,7 @@
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+      "dev": true,
       "requires": {
         "sprintf-js": "~1.0.2"
       }
@@ -636,11 +637,6 @@
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
       "dev": true
     },
-    "esprima": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
-      "integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A=="
-    },
     "etag": {
       "version": "1.8.1",
       "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
@@ -869,6 +865,11 @@
       "integrity": "sha1-6qM9bd16zo9/b+DJygRA5wZzix4=",
       "dev": true
     },
+    "is_js": {
+      "version": "0.9.0",
+      "resolved": "https://registry.npmjs.org/is_js/-/is_js-0.9.0.tgz",
+      "integrity": "sha1-CrlFQFArp6+iTIVqqYVWFmnpxS0="
+    },
     "is-accessor-descriptor": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz",
@@ -967,11 +968,6 @@
       "integrity": "sha1-HxbkqiKwTRM2tmGIpmrzxgDDpm0=",
       "dev": true
     },
-    "is_js": {
-      "version": "0.9.0",
-      "resolved": "https://registry.npmjs.org/is_js/-/is_js-0.9.0.tgz",
-      "integrity": "sha1-CrlFQFArp6+iTIVqqYVWFmnpxS0="
-    },
     "iso8601-duration": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/iso8601-duration/-/iso8601-duration-1.2.0.tgz",
@@ -1006,12 +1002,18 @@
       }
     },
     "js-yaml": {
-      "version": "3.13.0",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.13.0.tgz",
-      "integrity": "sha512-pZZoSxcCYco+DIKBTimr67J6Hy+EYGZDY/HCWC+iAEA9h1ByhMXAIVUXMcMFpOCxQ/xjXmPI2MkDL5HRm5eFrQ==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.1.tgz",
+      "integrity": "sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA==",
       "requires": {
-        "argparse": "^1.0.7",
-        "esprima": "^4.0.0"
+        "argparse": "^2.0.1"
+      },
+      "dependencies": {
+        "argparse": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
+          "integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q=="
+        }
       }
     },
     "jsonfile": {
@@ -1699,7 +1701,8 @@
     "sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
-      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw="
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "dev": true
     },
     "static-extend": {
       "version": "0.1.2",
diff --git a/aws-node-fullstack/backend/package.json b/aws-node-fullstack/backend/package.json
index 44501efe6..d6d9f79b3 100644
--- a/aws-node-fullstack/backend/package.json
+++ b/aws-node-fullstack/backend/package.json
@@ -7,7 +7,7 @@
   "author": "Serverless.com",
   "license": "MIT",
   "dependencies": {
-    "js-yaml": "^3.13.0",
+    "js-yaml": "^4.1.1",
     "serverless-finch": "^2.3.2"
   },
   "devDependencies": {