diff --git a/package.json b/package.json
index ce90da37..a89423ed 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
   "devDependencies": {
     "@fastify/formbody": "^8.0.0",
     "@fastify/multipart": "^9.0.0",
-    "@sinonjs/fake-timers": "^14.0.0",
+    "@sinonjs/fake-timers": "^15.0.0",
     "@types/node": "^24.0.8",
     "@types/tap": "^18.0.0",
     "c8": "^10.1.3",