diff --git a/package.json b/package.json
index c4770394..6147edcf 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,10 @@
 	},
 	"optionalDependencies": {
 		"bufferutil": "^4.0.2",
-		"utf-8-validate": "^5.0.3"
+		"erlpack": "github:discord/erlpack",
+		"sodium": "^3.0.2",
+		"utf-8-validate": "^5.0.3",
+		"zlib-sync": "^0.1.7"
 	},
 	"devDependencies": {
 		"eslint-config-amber": "^2.0.3",