diff --git a/index.js b/index.js
index 2877e50..f03fd3a 100644
--- a/index.js
+++ b/index.js
@@ -1,8 +1,8 @@
 const htmlparser = require('htmlparser2');
 const escapeStringRegexp = require('escape-string-regexp');
 const { klona } = require('klona');
+const { isPlainObject } = require('is-plain-object');
 const deepmerge = require('deepmerge');
-const isPlainObject = require('is-plain-object');
 const srcset = require('srcset');
 const postcss = require('postcss');
 const url = require('url');
diff --git a/package.json b/package.json
index 1ada151..62b15f8 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "deepmerge": "^4.2.2",
     "escape-string-regexp": "^4.0.0",
     "htmlparser2": "^4.1.0",
-    "is-plain-object": "^4.1.1",
+    "is-plain-object": "^5.0.0",
     "klona": "^2.0.3",
     "postcss": "^7.0.27",
     "srcset": "^3.0.0"