diff --git a/package.json b/package.json
index dfe8271..2572e86 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
   },
   "homepage": "https://github.com/substance/texture-xml-utils#readme",
   "devDependencies": {
-    "esm": "3.0.47",
+    "esm": "3.2.25",
     "nyc": "11.8.0",
     "rollup": "^1.20.3",
     "standard": "12.0.1",