diff --git a/package-lock.json b/package-lock.json
index fca2bc0d..c76a7864 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6676,9 +6676,9 @@
       "dev": true
     },
     "esm": {
-      "version": "3.2.20",
-      "resolved": "https://registry.npmjs.org/esm/-/esm-3.2.20.tgz",
-      "integrity": "sha512-NA92qDA8C/qGX/xMinDGa3+cSPs4wQoFxskRrSnDo/9UloifhONFm4sl4G+JsyCqM007z2K+BfQlH5rMta4K1Q=="
+      "version": "3.2.21",
+      "resolved": "https://registry.npmjs.org/esm/-/esm-3.2.21.tgz",
+      "integrity": "sha512-DkNi6jYtrT/FdO8pPEH+GFtBE321T3nup8FWdgaYpzaf4tK6aVJiCfgxNotZjEbnZ32t2VEtqIfbjp5GBN65Nw=="
     },
     "espree": {
       "version": "5.0.1",
diff --git a/package.json b/package.json
index f1cb707b..a42e826b 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "annyang": "2.6.1",
     "dataloader": "1.4.0",
     "es6-promise": "4.2.5",
-    "esm": "3.2.20",
+    "esm": "3.2.21",
     "ip": "1.1.5",
     "load-script": "1.0.0",
     "lodash": "4.17.11",