diff --git a/functions/package.json b/functions/package.json
index bbcb34a..41e05b7 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -26,7 +26,7 @@
   },
   "devDependencies": {
     "firebase-functions-test": "^0.2.0",
-    "typescript": "^3.8.0"
+    "typescript": "^4.5.5"
   },
   "private": true
 }
diff --git a/functions/yarn.lock b/functions/yarn.lock
index d003c33..df45660 100644
--- a/functions/yarn.lock
+++ b/functions/yarn.lock
@@ -2857,10 +2857,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@^3.8.0:
-  version "3.9.10"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.10.tgz#70f3910ac7a51ed6bef79da7800690b19bf778b8"
-  integrity sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q==
+typescript@^4.5.5:
+  version "4.5.5"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.5.5.tgz#d8c953832d28924a9e3d37c73d729c846c5896f3"
+  integrity sha512-TCTIul70LyWe6IJWT8QSYeA54WQe8EjQFU4wY52Fasj5UKx88LNYKCgBEHcOMOrFF1rKGbD8v/xcNWVUq9SymA==
 
 unbox-primitive@^1.0.1:
   version "1.0.1"