diff --git a/package.json b/package.json
index b9aae90f5..25a6787eb 100644
--- a/package.json
+++ b/package.json
@@ -61,7 +61,7 @@
     "ecstatic": "^3.0.0",
     "editor-layer-index": "osmlab/editor-layer-index.git#gh-pages",
     "eslint": "^5.15.0",
-    "esm": "~3.2.1",
+    "esm": "~3.2.9",
     "gaze": "^1.1.1",
     "glob": "^7.1.0",
     "happen": "^0.3.1",