diff --git a/package-lock.json b/package-lock.json
index 7a5e233..0da0472 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,7 +17,7 @@
         "urlpattern-polyfill": "^10.1.0"
       },
       "devDependencies": {
-        "@cloudflare/workers-types": "^4.20250607.0",
+        "@cloudflare/workers-types": "^4.20250820.0",
         "@types/mustache": "^4.2.6",
         "typescript": "^5.8.3",
         "wrangler": "^4.19.1"
@@ -151,9 +151,9 @@
       }
     },
     "node_modules/@cloudflare/workers-types": {
-      "version": "4.20250607.0",
-      "resolved": "https://registry.npmjs.org/@cloudflare/workers-types/-/workers-types-4.20250607.0.tgz",
-      "integrity": "sha512-OYmKNzC2eQy6CNj+j0go8Ut3SezjsprCgJyEaBzJql+473WAN9ndVnNZy9lj/tTyLV6wzpQkZWmRAKGDmacvkg==",
+      "version": "4.20250820.0",
+      "resolved": "https://registry.npmjs.org/@cloudflare/workers-types/-/workers-types-4.20250820.0.tgz",
+      "integrity": "sha512-WiGPOVlejDGlKRsTbaREkRKm8Xo5nHtucq5AmR/ObvKmaFOVVv0OQCW5Xht2YQgV0BfYPb/QEkO8oFjDXjBMZg==",
       "dev": true,
       "license": "MIT OR Apache-2.0"
     },
diff --git a/package.json b/package.json
index a271f2c..80ee7a0 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "urlpattern-polyfill": "^10.1.0"
   },
   "devDependencies": {
-    "@cloudflare/workers-types": "^4.20250607.0",
+    "@cloudflare/workers-types": "^4.20250820.0",
     "@types/mustache": "^4.2.6",
     "typescript": "^5.8.3",
     "wrangler": "^4.19.1"