diff --git a/code/backend-koa-runtypes-openapi/package.json b/code/backend-koa-runtypes-openapi/package.json
index 28b3400..3bc9360 100644
--- a/code/backend-koa-runtypes-openapi/package.json
+++ b/code/backend-koa-runtypes-openapi/package.json
@@ -78,7 +78,7 @@
     "raw-body": "^2.5.1",
     "ts-node": "10.9.1",
     "typescript": "5.1.6",
-    "undici": "5.26.2"
+    "undici": "5.28.4"
   },
   "scripts": {
     "build:run": "yarn run lint && yarn run tsc",
diff --git a/code/backend-koa-runtypes-openapi/yarn.lock b/code/backend-koa-runtypes-openapi/yarn.lock
index 3f3d100..0a0457e 100644
--- a/code/backend-koa-runtypes-openapi/yarn.lock
+++ b/code/backend-koa-runtypes-openapi/yarn.lock
@@ -3684,10 +3684,10 @@ typescript@^5.0.4:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.2.2.tgz#5ebb5e5a5b75f085f22bc3f8460fba308310fa78"
   integrity sha512-mI4WrpHsbCIcwT9cF4FZvr80QUeKvsUsUvKDoR+X/7XHQH98xYD8YHZg7ANtz2GtZt/CBq2QJ0thkGJMHfqc1w==
 
-undici@5.26.2:
-  version "5.26.2"
-  resolved "https://registry.yarnpkg.com/undici/-/undici-5.26.2.tgz#fa61bfe40f732540d15e58b0c1271872d8e3c995"
-  integrity sha512-a4PDLQgLTPHVzOK+x3F79/M4GtyYPl+aX9AAK7aQxpwxDwCqkeZCScy7Gk5kWT3JtdFq1uhO3uZJdLtHI4dK9A==
+undici@5.28.4:
+  version "5.28.4"
+  resolved "https://registry.yarnpkg.com/undici/-/undici-5.28.4.tgz#6b280408edb6a1a604a9b20340f45b422e373068"
+  integrity sha512-72RFADWFqKmUb2hmmvNODKL3p9hcB6Gt2DOQMis1SEBaV6a4MH8soBvzg+95CYhCKPFedut2JY9bMfrDl9D23g==
   dependencies:
     "@fastify/busboy" "^2.0.0"