diff --git a/package.json b/package.json
index f95d168..3362b41 100644
--- a/package.json
+++ b/package.json
@@ -18,9 +18,9 @@
   "devDependencies": {
     "chalk": "^2.4.2",
     "chokidar": "^1.7.0",
-    "es.shim": "^1.1.2",
-    "iofs": "^1.3.2",
-    "node-sass": "^4.12.0",
+    "es.shim": "^2.0.1",
+    "iofs": "^1.5.2",
+    "sass": "^1.32.5",
     "terser": "^5.0.0"
   }
 }