diff --git a/package.json b/package.json
index 257fd1e..79a7006 100644
--- a/package.json
+++ b/package.json
@@ -142,7 +142,7 @@
     "typescript": "^5.4.2"
   },
   "engines": {
-    "node": ">=20"
+    "node": ">=18"
   },
   "publishConfig": {
     "access": "public"
diff --git a/yarn.lock b/yarn.lock
index 29c6799..e04484c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1255,10 +1255,10 @@
   resolved "https://registry.npmjs.org/@types/node/-/node-8.0.0.tgz"
   integrity sha512-j2tekvJCO7j22cs+LO6i0kRPhmQ9MXaPZ55TzOc1lzkN5b6BWqq4AFjl04s1oRRQ1v5rSe+KEvnLUSTonuls/A==
 
-"@types/node@^20.11.27":
-  version "20.11.27"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-20.11.27.tgz#debe5cfc8a507dd60fe2a3b4875b1604f215c2ac"
-  integrity sha512-qyUZfMnCg1KEz57r7pzFtSGt49f6RPkPBis3Vo4PbS7roQEDn22hiHzl/Lo1q4i4hDEgBJmBF/NTNg2XR0HbFg==
+"@types/node@^20.11.28":
+  version "20.11.28"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-20.11.28.tgz#4fd5b2daff2e580c12316e457473d68f15ee6f66"
+  integrity sha512-M/GPWVS2wLkSkNHVeLkrF2fD5Lx5UC4PxA0uZcKc6QqbIQUJyW1jVjueJYi1z8n0I5PxYrtpnPnWglE+y9A0KA==
   dependencies:
     undici-types "~5.26.4"
 
@@ -3995,10 +3995,10 @@ koa-static@^5.0.0:
     debug "^3.1.0"
     koa-send "^5.0.0"
 
-koa@^2.15.0:
-  version "2.15.0"
-  resolved "https://registry.yarnpkg.com/koa/-/koa-2.15.0.tgz#d24ae1b0ff378bf12eb3df584ab4204e4c12ac2b"
-  integrity sha512-KEL/vU1knsoUvfP4MC4/GthpQrY/p6dzwaaGI6Rt4NQuFqkw3qrvsdYF5pz3wOfi7IGTvMPHC9aZIcUKYFNxsw==
+koa@^2.15.1:
+  version "2.15.1"
+  resolved "https://registry.yarnpkg.com/koa/-/koa-2.15.1.tgz#3d03840b8d9684c51b2b05a40ee7e7ba8621084c"
+  integrity sha512-kpxzGxsv7tlc0WmccWd6CfdWqYXk4o/FsCTjnKaDnHLjPK/Sy1MpoBkuKO5LN7GdPHgPljrAVmMO3wbFxEJTeA==
   dependencies:
     accepts "^1.3.5"
     cache-content-type "^1.0.0"