diff --git a/package.json b/package.json
index a9c7d63..fe461fe 100644
--- a/package.json
+++ b/package.json
@@ -92,7 +92,7 @@
     "test:unit": "vitest run --typecheck"
   },
   "devDependencies": {
-    "@cloudflare/workers-types": "^4.20260307.1",
+    "@cloudflare/workers-types": "^5.0.0",
     "@eslint/compat": "^1.4.1",
     "@eslint/markdown": "^7.5.1",
     "@kazupon/eslint-config": "^0.45.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b379a70..0f99df6 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -22,8 +22,8 @@ importers:
   .:
     devDependencies:
       '@cloudflare/workers-types':
-        specifier: ^4.20260307.1
-        version: 4.20260307.1
+        specifier: ^5.0.0
+        version: 5.20260801.1
       '@eslint/compat':
         specifier: ^1.4.1
         version: 1.4.1(eslint@9.39.4(jiti@2.6.1))
@@ -259,6 +259,9 @@ packages:
   '@cloudflare/workers-types@4.20260307.1':
     resolution: {integrity: sha512-0PvWLVVD6Q64V/XhollYtc8H35Vxm2rZi8bkZbEr3lK+mNgd2FBBVhlZ6A3saAUq3giRF4US/UfU/3a8i1PEcg==}
 
+  '@cloudflare/workers-types@5.20260801.1':
+    resolution: {integrity: sha512-XCv5xWi47WQOK0LpLa6997Mrpz8Ct+nZmp/M5Xp8Z4BFsarf7nYjkznGOcOoYK5m1GfbMFEEuQ2OIZnbIWoe9A==}
+
   '@cspotcode/source-map-support@0.8.1':
     resolution: {integrity: sha512-IchNf6dN4tHoMFIn/7OE8LWZ19Y6q/67Bmf6vnGREv8RSbBVb9LPJxEcnwrcwX6ixSvaiGoomAUvu4YSxXrVgw==}
     engines: {node: '>=12'}
@@ -4104,6 +4107,8 @@ snapshots:
 
   '@cloudflare/workers-types@4.20260307.1': {}
 
+  '@cloudflare/workers-types@5.20260801.1': {}
+
   '@cspotcode/source-map-support@0.8.1':
     dependencies:
       '@jridgewell/trace-mapping': 0.3.9