diff --git a/modules/pictures/_vendor/github.com/aFarkas/lazysizes/package.json b/modules/pictures/_vendor/github.com/aFarkas/lazysizes/package.json
index 14e5c3fa3..7f9adbbee 100644
--- a/modules/pictures/_vendor/github.com/aFarkas/lazysizes/package.json
+++ b/modules/pictures/_vendor/github.com/aFarkas/lazysizes/package.json
@@ -17,7 +17,7 @@
   "browser": "lazysizes.js",
   "types": "lazysizes.d.ts",
   "devDependencies": {
-    "grunt": "~1.1.0",
+    "grunt": "~1.6.1",
     "grunt-bytesize": "~0.2.0",
     "grunt-cli": "~1.3",
     "grunt-contrib-jshint": "^2.1.0",