diff --git a/hmm.json b/hmm.json
index 07816ff2d..d4454cf93 100644
--- a/hmm.json
+++ b/hmm.json
@@ -102,7 +102,7 @@
       "name": "polymod",
       "type": "git",
       "dir": null,
-      "ref": "develop",
+      "ref": "cfead69",
       "url": "https://github.com/larsiusprime/polymod"
     },
     {