diff --git a/talks/css-animation/package.json b/talks/css-animation/package.json
old mode 100755
new mode 100644
index 3164f04..3f59000
--- a/talks/css-animation/package.json
+++ b/talks/css-animation/package.json
@@ -20,7 +20,7 @@
 	},
 	"dependencies": {
 		"underscore" : "~1.3.3",
-		"express" : "~2.5.9",
+		"express" : "~4.17.1",
 		"socket.io" : "~0.9.6",
 		"mustache" : "~0.4.0"
 	},