diff --git a/package.json b/package.json
index 9389e9a9..87d09fae 100644
--- a/package.json
+++ b/package.json
@@ -13,13 +13,13 @@
     "heroku-postbuild": "npm run build"
   },
   "dependencies": {
-    "js-yaml": "3.14.1",
+    "js-yaml": "4.1.0",
     "probot": "9.15.1"
   },
   "devDependencies": {
     "@types/bunyan": "1.8.7",
     "@types/jest": "26.0.24",
-    "@types/js-yaml": "3.12.7",
+    "@types/js-yaml": "4.0.3",
     "@types/node": "10.17.60",
     "jest": "26.6.3",
     "nodemon": "2.0.13",
diff --git a/yarn.lock b/yarn.lock
index f06b77e3..80cdf4dc 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -792,10 +792,10 @@
     jest-diff "^26.0.0"
     pretty-format "^26.0.0"
 
-"@types/js-yaml@3.12.7":
-  version "3.12.7"
-  resolved "https://registry.yarnpkg.com/@types/js-yaml/-/js-yaml-3.12.7.tgz#330c5d97a3500e9c903210d6e49f02964af04a0e"
-  integrity sha512-S6+8JAYTE1qdsc9HMVsfY7+SgSuUU/Tp6TYTmITW0PZxiyIMvol3Gy//y69Wkhs0ti4py5qgR3uZH6uz/DNzJQ==
+"@types/js-yaml@4.0.3":
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/@types/js-yaml/-/js-yaml-4.0.3.tgz#9f33cd6fbf0d5ec575dc8c8fc69c7fec1b4eb200"
+  integrity sha512-5t9BhoORasuF5uCPr+d5/hdB++zRFUTMIZOzbNkr+jZh3yQht4HYbRDyj9fY8n2TZT30iW9huzav73x4NikqWg==
 
 "@types/mime@^1":
   version "1.3.2"
@@ -976,6 +976,11 @@ argparse@^1.0.7:
   dependencies:
     sprintf-js "~1.0.2"
 
+argparse@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/argparse/-/argparse-2.0.1.tgz#246f50f3ca78a3240f6c997e8a9bd1eac49e4b38"
+  integrity sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==
+
 arr-diff@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/arr-diff/-/arr-diff-4.0.0.tgz#d6461074febfec71e7e15235761a329a5dc7c520"
@@ -3135,7 +3140,14 @@ js-tokens@^4.0.0:
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-4.0.0.tgz#19203fb59991df98e3a287050d4647cdeaf32499"
   integrity sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==
 
-js-yaml@3.14.1, js-yaml@^3.13.1:
+js-yaml@4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-4.1.0.tgz#c1fb65f8f5017901cdd2c951864ba18458a10602"
+  integrity sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==
+  dependencies:
+    argparse "^2.0.1"
+
+js-yaml@^3.13.1:
   version "3.14.1"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.14.1.tgz#dae812fdb3825fa306609a8717383c50c36a0537"
   integrity sha512-okMH7OXXJ7YrN9Ok3/SXrnu4iX9yOk+25nqX4imS2npuvTYDmo/QEZoqwZkYaIDk3jVvBOTOIEgEhaLOynBS9g==