diff --git a/CHANGELOG.md b/CHANGELOG.md
index bd421b8..dd7bf90 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,12 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [4.0.0-rc.4](https://github.com/postcss-modules-local-by-default/compare/v4.0.0-rc.4...v4.0.0) - 2020-10-13
+
+### Fixes
+
+- compatibility with plugins other plugins
+
 ## [4.0.0-rc.4](https://github.com/postcss-modules-local-by-default/compare/v4.0.0-rc.3...v4.0.0-rc.4) - 2020-10-11
 
 ### Fixes
diff --git a/package.json b/package.json
index ef86bd4..769c775 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "postcss-modules-local-by-default",
-  "version": "4.0.0-rc.4",
+  "version": "4.0.0",
   "description": "A CSS Modules transform to make local scope the default",
   "main": "src/index.js",
   "author": "Mark Dalgleish",
@@ -33,7 +33,7 @@
     "prepublishOnly": "yarn test"
   },
   "dependencies": {
-    "icss-utils": "^5.0.0-rc.0",
+    "icss-utils": "^5.0.0",
     "postcss-selector-parser": "^6.0.2",
     "postcss-value-parser": "^4.1.0"
   },
diff --git a/src/index.js b/src/index.js
index cd0cae7..cbd269e 100644
--- a/src/index.js
+++ b/src/index.js
@@ -421,6 +421,8 @@ function localizeDeclaration(declaration, context) {
 
 module.exports = (options = {}) => {
   if (
+    options &&
+    options.mode &&
     options.mode !== "global" &&
     options.mode !== "local" &&
     options.mode !== "pure"
@@ -430,8 +432,8 @@ module.exports = (options = {}) => {
     );
   }
 
-  const pureMode = options.mode === "pure";
-  const globalMode = options.mode === "global";
+  const pureMode = options && options.mode === "pure";
+  const globalMode = options && options.mode === "global";
 
   return {
     postcssPlugin: "postcss-modules-local-by-default",
@@ -439,7 +441,7 @@ module.exports = (options = {}) => {
       const localAliasMap = new Map();
 
       return {
-        OnceExit(root) {
+        Once(root) {
           const { icssImports } = extractICSS(root, false);
 
           Object.keys(icssImports).forEach((key) => {
diff --git a/yarn.lock b/yarn.lock
index 209edf5..0c1fd40 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1877,10 +1877,10 @@ iconv-lite@0.4.24:
   dependencies:
     safer-buffer ">= 2.1.2 < 3"
 
-icss-utils@^5.0.0-rc.0:
-  version "5.0.0-rc.0"
-  resolved "https://registry.yarnpkg.com/icss-utils/-/icss-utils-5.0.0-rc.0.tgz#c72082bd0edaa2cd85b25bfe98db2e49be8d4306"
-  integrity sha512-iTcLOd8eGcKQBusS3SRQYCK324r6Aov3GlfWRbRYC9oAp93v1qm7kBWB0WeEjZ3rGoOvymTkQUhOiTokNz9mKg==
+icss-utils@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/icss-utils/-/icss-utils-5.0.0.tgz#03ed56c3accd32f9caaf1752ebf64ef12347bb84"
+  integrity sha512-aF2Cf/CkEZrI/vsu5WI/I+akFgdbwQHVE9YRZxATrhH4PVIe6a3BIjwjEcW+z+jP/hNh+YvM3lAAn1wJQ6opSg==
 
 ignore@^4.0.6:
   version "4.0.6"