diff --git a/package.json b/package.json
index 7c4cfdaa..f3070c11 100644
--- a/package.json
+++ b/package.json
@@ -27,14 +27,14 @@
         "grunt-cli": "^1.2.0",
         "grunt-eslint": "^20.1.0",
         "grunt-mocha-test": "^0.13.3",
-        "libbase64": "^0.2.0",
+        "libbase64": "^1.0.1",
         "libmime": "^3.1.0",
         "libqp": "^1.1.0",
         "mocha": "^4.0.1",
         "proxy": "^0.2.4",
         "proxy-test-server": "^1.0.0",
-        "sinon": "^4.1.2",
-        "smtp-server": "^3.3.0"
+        "sinon": "^4.1.3",
+        "smtp-server": "^3.4.1"
     },
     "engines": {
         "node": ">=6.0.0"