diff --git a/package-lock.json b/package-lock.json
index 482e3f0..54aaa18 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,7 +27,7 @@
         "mocha": "^11.0.0",
         "ngrok": "^5.0.0-beta.2",
         "prettier": "^3.2.5",
-        "sinon": "^20.0.0",
+        "sinon": "^21.0.0",
         "wrangler": "^4.13.2"
       }
     },
@@ -4399,10 +4399,11 @@
       }
     },
     "node_modules/sinon": {
-      "version": "20.0.0",
-      "resolved": "https://registry.npmjs.org/sinon/-/sinon-20.0.0.tgz",
-      "integrity": "sha512-+FXOAbdnj94AQIxH0w1v8gzNxkawVvNqE3jUzRLptR71Oykeu2RrQXXl/VQjKay+Qnh73fDt/oDfMo6xMeDQbQ==",
+      "version": "21.0.0",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-21.0.0.tgz",
+      "integrity": "sha512-TOgRcwFPbfGtpqvZw+hyqJDvqfapr1qUlOizROIk4bBLjlsjlB00Pg6wMFXNtJRpu+eCZuVOaLatG7M8105kAw==",
       "dev": true,
+      "license": "BSD-3-Clause",
       "dependencies": {
         "@sinonjs/commons": "^3.0.1",
         "@sinonjs/fake-timers": "^13.0.5",
@@ -7881,9 +7882,9 @@
       }
     },
     "sinon": {
-      "version": "20.0.0",
-      "resolved": "https://registry.npmjs.org/sinon/-/sinon-20.0.0.tgz",
-      "integrity": "sha512-+FXOAbdnj94AQIxH0w1v8gzNxkawVvNqE3jUzRLptR71Oykeu2RrQXXl/VQjKay+Qnh73fDt/oDfMo6xMeDQbQ==",
+      "version": "21.0.0",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-21.0.0.tgz",
+      "integrity": "sha512-TOgRcwFPbfGtpqvZw+hyqJDvqfapr1qUlOizROIk4bBLjlsjlB00Pg6wMFXNtJRpu+eCZuVOaLatG7M8105kAw==",
       "dev": true,
       "requires": {
         "@sinonjs/commons": "^3.0.1",
diff --git a/package.json b/package.json
index 1f4dfbb..4a14b30 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "mocha": "^11.0.0",
     "ngrok": "^5.0.0-beta.2",
     "prettier": "^3.2.5",
-    "sinon": "^20.0.0",
+    "sinon": "^21.0.0",
     "wrangler": "^4.13.2"
   }
 }