diff --git a/package.json b/package.json
index 7d5e7a2..1631690 100644
--- a/package.json
+++ b/package.json
@@ -66,7 +66,7 @@
     "html-webpack-plugin": "^3.2.0",
     "image-webpack-loader": "^4.3.1",
     "imagemin": "^6.0.0",
-    "imagemin-optipng": "^5.2.1",
+    "imagemin-optipng": "^6.0.0",
     "imagemin-pngquant": "^6.0.0",
     "mini-css-extract-plugin": "^0.4.2",
     "node-sass": "^4.11.0",