diff --git a/packages/size-limit/get-config.js b/packages/size-limit/get-config.js
index 5f06908c..54548f9d 100644
--- a/packages/size-limit/get-config.js
+++ b/packages/size-limit/get-config.js
@@ -1,5 +1,5 @@
 let { isAbsolute, dirname, join, relative } = require('path')
-let { cosmiconfig } = require('cosmiconfig')
+let { lilconfig } = require('lilconfig')
 let globby = require('globby')
 let bytes = require('bytes')
 
@@ -99,7 +99,7 @@ module.exports = async function getConfig (plugins, process, args, pkg) {
   if (args.files.length > 0) {
     config.checks = [{ files: args.files }]
   } else {
-    let explorer = cosmiconfig('size-limit', {
+    let explorer = lilconfig('size-limit', {
       searchPlaces: [
         'package.json',
         '.size-limit.json',
@@ -116,18 +116,19 @@ module.exports = async function getConfig (plugins, process, args, pkg) {
     config.cwd = dirname(result.filepath)
     config.checks = await Promise.all(
       result.config.map(async check => {
+        let processed = { ...check }
         if (check.path) {
-          check.files = await globby(check.path, { cwd: config.cwd })
+          processed.files = await globby(check.path, { cwd: config.cwd })
         } else if (!check.entry) {
           if (pkg.packageJson.main) {
-            check.files = [
+            processed.files = [
               require.resolve(join(dirname(pkg.path), pkg.packageJson.main))
             ]
           } else {
-            check.files = [join(dirname(pkg.path), 'index.js')]
+            processed.files = [join(dirname(pkg.path), 'index.js')]
           }
         }
-        return check
+        return processed
       })
     )
   }
diff --git a/packages/size-limit/package.json b/packages/size-limit/package.json
index d2a9c586..b472c065 100644
--- a/packages/size-limit/package.json
+++ b/packages/size-limit/package.json
@@ -22,8 +22,8 @@
     "chokidar": "^3.4.3",
     "ci-job-number": "^1.2.2",
     "colorette": "^1.2.1",
-    "cosmiconfig": "^7.0.0",
     "globby": "^11.0.1",
+    "lilconfig": "^2.0.1",
     "ora": "^5.1.0",
     "read-pkg-up": "^7.0.1"
   }
diff --git a/yarn.lock b/yarn.lock
index 1705df09..69f0f1ea 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5055,6 +5055,11 @@ levn@~0.3.0:
     prelude-ls "~1.1.2"
     type-check "~0.3.2"
 
+lilconfig@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/lilconfig/-/lilconfig-2.0.1.tgz#24353e5eadfbd7fcf314bad46714161e4e085ebf"
+  integrity sha512-fFzm+Lj/Up8OGJfygxz1VLVuihcqZQpqFMmQ3yklVwUIA8Z6LWBwiISObInLg8R8g9E9r7b9t2+kh8+N7vRS+g==
+
 line-column@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/line-column/-/line-column-1.0.2.tgz#d25af2936b6f4849172b312e4792d1d987bc34a2"