diff --git a/package-lock.json b/package-lock.json
index 0380480..390d549 100644
--- a/package-lock.json
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-      "integrity": "sha512-wbjnvcc3HOPKRE/L0KmTv2MrByfLFOJlVFNKo5Svxy+1plR/bMIMYQDgB4pUOzJXhiBLU7Clp6P1SSzS89iKxA==",
-      "requires": {
-        "ansi-html": "0.0.7",
-        "html-entities": "1.2.1",
-        "querystring": "0.2.0",
-        "strip-ansi": "3.0.1"
-      }
-    },
     "webpack-sources": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.1.0.tgz",
diff --git a/package.json b/package.json
index 471e30a..ef5a906 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "cross-env": "5.1.4",
     "css-loader": "0.28.11",
     "escape-html": "1.0.3",
-    "esm": "3.0.20",
+    "esm": "3.0.21",
     "events": "2.0.0",
     "express": "4.16.3",
     "fg-loadcss": "2.0.1",