diff --git a/hmm.json b/hmm.json
index 1b3cf9f..e80c671 100644
--- a/hmm.json
+++ b/hmm.json
@@ -13,7 +13,7 @@
     {
       "name": "flixel",
       "type": "haxelib",
-      "version": null
+      "version": "5.5.0"
     },
     {
       "name": "flixel-addons",