diff --git a/package-lock.json b/package-lock.json
index 38ae456..3091642 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -31,7 +31,7 @@
         "minimist": "^1.2.8",
         "mocha": "^11.0.1",
         "node-rsa": "^1.1.1",
-        "sinon": "^20.0.0",
+        "sinon": "^21.0.0",
         "standard": "^17.1.0"
       }
     },
@@ -6039,9 +6039,9 @@
       }
     },
     "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 70eaac6..eec843b 100644
--- a/package.json
+++ b/package.json
@@ -77,7 +77,7 @@
     "minimist": "^1.2.8",
     "mocha": "^11.0.1",
     "node-rsa": "^1.1.1",
-    "sinon": "^20.0.0",
+    "sinon": "^21.0.0",
     "standard": "^17.1.0"
   }
 }