diff --git a/package-lock.json b/package-lock.json
index b521b48b..aab560fb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -28,7 +28,7 @@
         "@types/node": "^24.12.0",
         "@types/sinon": "^21.0.0",
         "@vercel/ncc": "^0.38.4",
-        "sinon": "^21.0.2",
+        "sinon": "^21.0.3",
         "typescript": "^5.9.3"
       },
       "engines": {
@@ -407,9 +407,9 @@
       }
     },
     "node_modules/@sinonjs/samsam": {
-      "version": "9.0.2",
-      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-9.0.2.tgz",
-      "integrity": "sha512-H/JSxa4GNKZuuU41E3b8Y3tbSEx8y4uq4UH1C56ONQac16HblReJomIvv3Ud7ANQHQmkeSowY49Ij972e/pGxQ==",
+      "version": "9.0.3",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-9.0.3.tgz",
+      "integrity": "sha512-ZgYY7Dc2RW+OUdnZ1DEHg00lhRt+9BjymPKHog4PRFzr1U3MbK57+djmscWyKxzO1qfunHqs4N45WWyKIFKpiQ==",
       "dev": true,
       "license": "BSD-3-Clause",
       "dependencies": {
@@ -1047,15 +1047,15 @@
       }
     },
     "node_modules/sinon": {
-      "version": "21.0.2",
-      "resolved": "https://registry.npmjs.org/sinon/-/sinon-21.0.2.tgz",
-      "integrity": "sha512-VHV4UaoxIe5jrMd89Y9duI76T5g3Lp+ET+ctLhLDaZtSznDPah1KKpRElbdBV4RwqWSw2vadFiVs9Del7MbVeQ==",
+      "version": "21.0.3",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-21.0.3.tgz",
+      "integrity": "sha512-0x8TQFr8EjADhSME01u1ZK31yv2+bd6Z5NrBCHVM+n4qL1wFqbxftmeyi3bwlr49FbbzRfrqSFOpyHCOh/YmYA==",
       "dev": true,
       "license": "BSD-3-Clause",
       "dependencies": {
         "@sinonjs/commons": "^3.0.1",
         "@sinonjs/fake-timers": "^15.1.1",
-        "@sinonjs/samsam": "^9.0.2",
+        "@sinonjs/samsam": "^9.0.3",
         "diff": "^8.0.3",
         "supports-color": "^7.2.0"
       },
diff --git a/package.json b/package.json
index ec2a67bb..35c4e1ce 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "@types/node": "^24.12.0",
     "@types/sinon": "^21.0.0",
     "@vercel/ncc": "^0.38.4",
-    "sinon": "^21.0.2",
+    "sinon": "^21.0.3",
     "typescript": "^5.9.3"
   }
 }