diff --git a/package.json b/package.json
index a7e3231e..c1013fa4 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
     "chai": "^4.2.0",
     "cheerio": "1.0.0-rc.12",
     "codecov": "^3.0.2",
-    "engine.io": "6.6.2",
+    "engine.io": "6.6.3",
     "gts": "^5.0.0",
     "is-docker": "^2.0.0",
     "jsdoc": "^4.0.0",