diff --git a/functions/package.json b/functions/package.json
index 4cb5d33..5594cc7 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -29,7 +29,7 @@
   },
   "devDependencies": {
     "@types/cors": "2.8.6",
-    "@types/express": "4.17.1",
+    "@types/express": "5.0.0",
     "@typescript-eslint/eslint-plugin": "2.0.0",
     "@typescript-eslint/parser": "2.0.0",
     "eslint": "6.2.1",
diff --git a/functions/yarn.lock b/functions/yarn.lock
index 8d30923..9a5836d 100644
--- a/functions/yarn.lock
+++ b/functions/yarn.lock
@@ -253,7 +253,17 @@
     "@types/node" "*"
     "@types/range-parser" "*"
 
-"@types/express@*", "@types/express@4.17.1", "@types/express@^4.17.0":
+"@types/express-serve-static-core@^5.0.0":
+  version "5.0.4"
+  resolved "https://registry.yarnpkg.com/@types/express-serve-static-core/-/express-serve-static-core-5.0.4.tgz#88c29e3052cec3536d64b6ce5015a30dfcbefca7"
+  integrity sha512-5kz9ScmzBdzTgB/3susoCgfqNDzBjvLL4taparufgSvlwjdLy6UyUy9T/tCpYd2GIdIilCatC4iSQS0QSYHt0w==
+  dependencies:
+    "@types/node" "*"
+    "@types/qs" "*"
+    "@types/range-parser" "*"
+    "@types/send" "*"
+
+"@types/express@*", "@types/express@^4.17.0":
   version "4.17.1"
   resolved "https://registry.yarnpkg.com/@types/express/-/express-4.17.1.tgz#4cf7849ae3b47125a567dfee18bfca4254b88c5c"
   integrity sha512-VfH/XCP0QbQk5B5puLqTLEeFgR8lfCJHZJKkInZ9mkYd+u8byX0kztXEQxEk4wZXJs8HI+7km2ALXjn4YKcX9w==
@@ -262,6 +272,16 @@
     "@types/express-serve-static-core" "*"
     "@types/serve-static" "*"
 
+"@types/express@5.0.0":
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/@types/express/-/express-5.0.0.tgz#13a7d1f75295e90d19ed6e74cab3678488eaa96c"
+  integrity sha512-DvZriSMehGHL1ZNLzi6MidnsDhUZM/x2pRdDIKdwbUNqqwHxMlRdkxtn6/EPKyqKpHqTl/4nRZsRNLpZxZRpPQ==
+  dependencies:
+    "@types/body-parser" "*"
+    "@types/express-serve-static-core" "^5.0.0"
+    "@types/qs" "*"
+    "@types/serve-static" "*"
+
 "@types/glob@^7.1.1":
   version "7.1.1"
   resolved "https://registry.yarnpkg.com/@types/glob/-/glob-7.1.1.tgz#aa59a1c6e3fbc421e07ccd31a944c30eba521575"
@@ -286,6 +306,11 @@
   resolved "https://registry.yarnpkg.com/@types/mime/-/mime-2.0.1.tgz#dc488842312a7f075149312905b5e3c0b054c79d"
   integrity sha512-FwI9gX75FgVBJ7ywgnq/P7tw+/o1GUbtP0KzbtusLigAOgIgNISRK0ZPl4qertvXSIE8YbsVJueQ90cDt9YYyw==
 
+"@types/mime@^1":
+  version "1.3.5"
+  resolved "https://registry.yarnpkg.com/@types/mime/-/mime-1.3.5.tgz#1ef302e01cf7d2b5a0fa526790c9123bf1d06690"
+  integrity sha512-/pyBZWSLD2n0dcHE3hq8s8ZvcETHtEuF+3E7XVt0Ig2nvsVQXdghHVcEkIWjy9A0wKfTn97a/PSDYohKIlnP/w==
+
 "@types/minimatch@*":
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.3.tgz#3dca0e3f33b200fc7d1139c0cd96c1268cadfd9d"
@@ -311,11 +336,24 @@
   resolved "https://registry.yarnpkg.com/@types/normalize-package-data/-/normalize-package-data-2.4.0.tgz#e486d0d97396d79beedd0a6e33f4534ff6b4973e"
   integrity sha512-f5j5b/Gf71L+dbqxIpQ4Z2WlmI/mPJ0fOkGGmFgtb6sAu97EPczzbS3/tJKxmcYDj55OX6ssqwDAWOHIYDRDGA==
 
+"@types/qs@*":
+  version "6.9.17"
+  resolved "https://registry.yarnpkg.com/@types/qs/-/qs-6.9.17.tgz#fc560f60946d0aeff2f914eb41679659d3310e1a"
+  integrity sha512-rX4/bPcfmvxHDv0XjfJELTTr+iB+tn032nPILqHm5wbthUUUuVtNGGqzhya9XUxjTP8Fpr0qYgSZZKxGY++svQ==
+
 "@types/range-parser@*":
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/@types/range-parser/-/range-parser-1.2.3.tgz#7ee330ba7caafb98090bece86a5ee44115904c2c"
   integrity sha512-ewFXqrQHlFsgc09MK5jP5iR7vumV/BYayNC6PgJO2LPe8vrnNFyjQjSppfEngITi0qvfKtzFvgKymGheFM9UOA==
 
+"@types/send@*":
+  version "0.17.4"
+  resolved "https://registry.yarnpkg.com/@types/send/-/send-0.17.4.tgz#6619cd24e7270793702e4e6a4b958a9010cfc57a"
+  integrity sha512-x2EM6TJOybec7c52BX0ZspPodMsQUd5L6PRwOunVyVUhXiBSKf3AezDL8Dgvgt5o0UfKNfuA0eMLr2wLT4AiBA==
+  dependencies:
+    "@types/mime" "^1"
+    "@types/node" "*"
+
 "@types/serve-static@*":
   version "1.13.3"
   resolved "https://registry.yarnpkg.com/@types/serve-static/-/serve-static-1.13.3.tgz#eb7e1c41c4468272557e897e9171ded5e2ded9d1"