diff --git a/package.json b/package.json
index f7099c1..79b2538 100644
--- a/package.json
+++ b/package.json
@@ -19,8 +19,9 @@
     "mocha": "^5.0.0"
   },
   "dependencies": {
-    "@sendgrid/client": "^6.3.0",
-    "@sendgrid/mail": "^6.3.0",
+    "@sendgrid/client": "6.3.0",
+    "@sendgrid/mail": "6.3.1",
+    "@sendgrid/helpers": "6.3.0",
     "bluebird": "^3.5.1",
     "body-parser": "^1.15.2",
     "co": "^4.6.0",