diff --git a/ep12/demo/package.json b/ep12/demo/package.json
index 3354c9f..8ebd485 100644
--- a/ep12/demo/package.json
+++ b/ep12/demo/package.json
@@ -19,7 +19,7 @@
   "devDependencies": {
     "@types/aws-lambda": "^8.10.36",
     "@types/node": "^12.12.9",
-    "aws-sdk": "~2.536.0",
+    "aws-sdk": "~2.814.0",
     "concurrently": "^5.0.0",
     "prettier": "^1.19.1",
     "ts-loader": "^6.2.1",
diff --git a/ep12/demo/yarn.lock b/ep12/demo/yarn.lock
index c51c307..9f7d1ab 100644
--- a/ep12/demo/yarn.lock
+++ b/ep12/demo/yarn.lock
@@ -293,12 +293,12 @@ atob@^2.1.1:
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
   integrity sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==
 
-aws-sdk@~2.536.0:
-  version "2.536.0"
-  resolved "https://registry.yarnpkg.com/aws-sdk/-/aws-sdk-2.536.0.tgz#8ef8465607553408e79cdbe90d661941c32c5cb8"
-  integrity sha512-d91ASAgDtjP5Al8nRtdOhnS6m7XczqdmVfkyFtd7GlWJ2jy2NxQ+PI4QVp7n/74BNRSSLoyxmCqz2Ulqu3TOsQ==
+aws-sdk@~2.814.0:
+  version "2.814.0"
+  resolved "https://registry.yarnpkg.com/aws-sdk/-/aws-sdk-2.814.0.tgz#7a1c36006e0b5826f14bd2511b1d229ef6814bb0"
+  integrity sha512-empd1m/J/MAkL6d9OeRpmg9thobULu0wk4v8W3JToaxGi2TD7PIdvE6yliZKyOVAdJINhBWEBhxR4OUIHhcGbQ==
   dependencies:
-    buffer "4.9.1"
+    buffer "4.9.2"
     events "1.1.1"
     ieee754 "1.1.13"
     jmespath "0.15.0"
@@ -456,16 +456,7 @@ buffer-xor@^1.0.3:
   resolved "https://registry.yarnpkg.com/buffer-xor/-/buffer-xor-1.0.3.tgz#26e61ed1422fb70dd42e6e36729ed51d855fe8d9"
   integrity sha1-JuYe0UIvtw3ULm42cp7VHYVf6Nk=
 
-buffer@4.9.1:
-  version "4.9.1"
-  resolved "https://registry.yarnpkg.com/buffer/-/buffer-4.9.1.tgz#6d1bb601b07a4efced97094132093027c95bc298"
-  integrity sha1-bRu2AbB6TvztlwlBMgkwJ8lbwpg=
-  dependencies:
-    base64-js "^1.0.2"
-    ieee754 "^1.1.4"
-    isarray "^1.0.0"
-
-buffer@^4.3.0:
+buffer@4.9.2, buffer@^4.3.0:
   version "4.9.2"
   resolved "https://registry.yarnpkg.com/buffer/-/buffer-4.9.2.tgz#230ead344002988644841ab0244af8c44bbe3ef8"
   integrity sha512-xq+q3SRMOxGivLhBNaUdC64hDTQwejJ+H0T/NB1XMtTVEwNTrfFF3gAxiyW0Bu/xWEGhjVKgUcMhCrUy2+uCWg==