diff --git a/package-lock.json b/package-lock.json
index 26e98e1f..ed337bb6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,7 +29,7 @@
         "nock": "14.0.2",
         "prettier": "3.5.3",
         "semantic-release": "24.2.5",
-        "sinon": "20.0.0",
+        "sinon": "21.0.0",
         "tempy": "1.0.1"
       },
       "engines": {
@@ -8585,9 +8585,9 @@
       }
     },
     "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 20d1ac8c..7b6e61e2 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "nock": "14.0.2",
     "prettier": "3.5.3",
     "semantic-release": "24.2.5",
-    "sinon": "20.0.0",
+    "sinon": "21.0.0",
     "tempy": "1.0.1"
   },
   "engines": {