diff --git a/package-lock.json b/package-lock.json
index cde63fb..a479350 100644
--- a/package-lock.json
+++ b/package-lock.json
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       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
       "integrity": "sha512-ncTzHV7NvsQZkYe1DW7cbDLm0YpzHmZF5r/iyP3ZnQtMiJ+pjzisCiMNI+Sj+xQF5pXhSHxSB3uDbsBTzY/c2A==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "node_modules/yargs": {
       "version": "7.1.2",
diff --git a/package.json b/package.json
old mode 100755
new mode 100644
index 9cd425a..c51ac38
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "gulp": "^4.0.2",
     "gulp-changed": "^4.0.0",
     "gulp-imagemin": "^6.0.0",
-    "gulp-sass": "^4.0.2",
+    "gulp-sass": "^6.0.1",
     "gulp-sourcemaps": "^2.6.5",
     "gulp-watch": "^5.0.1"
   }