diff --git a/packages/fastify-sse/package.json b/packages/fastify-sse/package.json
index 930b0b25..2dc0435b 100644
--- a/packages/fastify-sse/package.json
+++ b/packages/fastify-sse/package.json
@@ -21,6 +21,9 @@
   "peerDependencies": {
     "fastify": "^5.0.0"
   },
+  "devDependencies": {
+    "vitest": "^3.0.0"
+  },
   "publishConfig": {
     "registry": "http://localhost:3300/api/packages/bytelyst/npm/"
   }