diff --git a/package-lock.json b/package-lock.json
index a5aae4e..ebbc549 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -42,7 +42,7 @@
         "js-yaml": "^4.1.0",
         "mocha": "^11.6.0",
         "nyc": "^17.1.0",
-        "sinon": "^20.0.0",
+        "sinon": "^21.0.0",
         "sinon-chai": "^3.7.0",
         "ts-node": "^10.9.1",
         "typescript": "^5.8.3"
@@ -10564,9 +10564,9 @@
       }
     },
     "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 eab0035..a9926e1 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "js-yaml": "^4.1.0",
     "mocha": "^11.6.0",
     "nyc": "^17.1.0",
-    "sinon": "^20.0.0",
+    "sinon": "^21.0.0",
     "sinon-chai": "^3.7.0",
     "ts-node": "^10.9.1",
     "typescript": "^5.8.3"