diff --git a/package-lock.json b/package-lock.json
index 1c27994..003bd60 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,7 @@
       "devDependencies": {
         "mocha": "11.1.0",
         "should": "13.2.3",
-        "sinon": "20.0.0"
+        "sinon": "21.0.0"
       }
     },
     "node_modules/@isaacs/cliui": {
@@ -1055,9 +1055,9 @@
       }
     },
     "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": {
diff --git a/package.json b/package.json
index f15221e..e4395f7 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   "devDependencies": {
     "mocha": "11.1.0",
     "should": "13.2.3",
-    "sinon": "20.0.0"
+    "sinon": "21.0.0"
   },
   "dependencies": {},
   "repository": {