diff --git a/package.json b/package.json
index 346a301..c3fcd55 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
         "hyperswarm": "^4.3.5",
         "prettier": "^2.7.1",
         "protoc": "^1.1.3",
+        "sleep-promise": "^9.1.0",
         "sodium-universal": "^3.1.0",
         "tape": "^5.6.1"
     }