diff --git a/docs/slides/plpv14/_support/reveal/package.json b/docs/slides/plpv14/_support/reveal/package.json
index cbd3bc70e1..69919c228f 100644
--- a/docs/slides/plpv14/_support/reveal/package.json
+++ b/docs/slides/plpv14/_support/reveal/package.json
@@ -13,7 +13,7 @@
 	"dependencies": {
 		"underscore" : "1.3.3",
 		"express" : "4.17.3",
-		"socket.io" : "0.9.6",
+		"socket.io" : "2.4.0",
 		"mustache" : "0.4.0"
 	},
 	"devDependencies": {}