diff --git a/modules/caching-materials-manager-browser/package.json b/modules/caching-materials-manager-browser/package.json
index 29d8b5f8d..724370cc4 100644
--- a/modules/caching-materials-manager-browser/package.json
+++ b/modules/caching-materials-manager-browser/package.json
@@ -21,6 +21,7 @@
     "@aws-crypto/serialize": "file:../serialize",
     "@aws-crypto/web-crypto-backend": "file:../web-crypto-backend",
     "@aws-sdk/util-base64-browser": "1.0.0-beta.2",
+    "@aws-sdk/util-utf8-browser": "1.0.0-beta.2",
     "tslib": "^1.11.1"
   },
   "sideEffects": false,