diff --git a/package-lock.json b/package-lock.json
index ebe16c26..1bcc2e21 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,7 +41,7 @@
         "@types/mock-fs": "^4.13.4",
         "@types/node": "^24.10.1",
         "@types/ora": "^3.1.0",
-        "@types/sinon": "^17.0.4",
+        "@types/sinon": "^21.0.0",
         "@types/sloc": "^0.2.3",
         "@types/terminal-link": "^1.1.0",
         "@types/update-notifier": "^6.0.8",
@@ -5884,7 +5884,9 @@
       }
     },
     "node_modules/@types/sinon": {
-      "version": "17.0.4",
+      "version": "21.0.0",
+      "resolved": "https://registry.npmjs.org/@types/sinon/-/sinon-21.0.0.tgz",
+      "integrity": "sha512-+oHKZ0lTI+WVLxx1IbJDNmReQaIsQJjN2e7UUrJHEeByG7bFeKJYsv1E75JxTQ9QKJDp21bAa/0W2Xo4srsDnw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/package.json b/package.json
index 6e262191..baa18609 100644
--- a/package.json
+++ b/package.json
@@ -71,7 +71,7 @@
     "@types/mock-fs": "^4.13.4",
     "@types/node": "^24.10.1",
     "@types/ora": "^3.1.0",
-    "@types/sinon": "^17.0.4",
+    "@types/sinon": "^21.0.0",
     "@types/sloc": "^0.2.3",
     "@types/terminal-link": "^1.1.0",
     "@types/update-notifier": "^6.0.8",