diff --git a/package-lock.json b/package-lock.json
index 27ae6997..8a6d8b4e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,7 +24,7 @@
         "cspell": "^9.6.2",
         "cssnano": "^7.1.2",
         "del": "^7.1.0",
-        "del-cli": "^7.0.0",
+        "del-cli": "^6.0.0",
         "eslint": "^9.32.0",
         "eslint-config-webpack": "^4.9.1",
         "husky": "^9.1.3",
@@ -9114,15 +9114,14 @@
       }
     },
     "node_modules/del-cli": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/del-cli/-/del-cli-7.0.0.tgz",
-      "integrity": "sha512-fRl4pWJYu9WFQH8jXdQUYvcD0IMtij9WEc7qmB7xOyJEweNJNuE7iKmqNeoOT1DbBUjtRjxlw8Y63qKBI/NQ1g==",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/del-cli/-/del-cli-6.0.0.tgz",
+      "integrity": "sha512-9nitGV2W6KLFyya4qYt4+9AKQFL+c0Ehj5K7V7IwlxTc6RMCfQUGY9E9pLG6e8TQjtwXpuiWIGGZb3mfVxyZkw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "del": "^8.0.1",
-        "meow": "^14.0.0",
-        "presentable-error": "^0.0.1"
+        "del": "^8.0.0",
+        "meow": "^13.2.0"
       },
       "bin": {
         "del": "cli.js",
@@ -9189,13 +9188,13 @@
       }
     },
     "node_modules/del-cli/node_modules/meow": {
-      "version": "14.0.0",
-      "resolved": "https://registry.npmjs.org/meow/-/meow-14.0.0.tgz",
-      "integrity": "sha512-JhC3R1f6dbspVtmF3vKjAWz1EVIvwFrGGPLSdU6rK79xBwHWTuHoLnRX/t1/zHS1Ch1Y2UtIrih7DAHuH9JFJA==",
+      "version": "13.2.0",
+      "resolved": "https://registry.npmjs.org/meow/-/meow-13.2.0.tgz",
+      "integrity": "sha512-pxQJQzB6djGPXh08dacEloMFopsOqGVRKFPYvPOt9XDZ1HasbgDZA74CJGreSU4G3Ak7EFJGoiH2auq+yXISgA==",
       "dev": true,
       "license": "MIT",
       "engines": {
-        "node": ">=20"
+        "node": ">=18"
       },
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
diff --git a/package.json b/package.json
index 03c53230..c4983206 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
     "cspell": "^9.6.2",
     "cssnano": "^7.1.2",
     "del": "^7.1.0",
-    "del-cli": "^7.0.0",
+    "del-cli": "^6.0.0",
     "eslint": "^9.32.0",
     "eslint-config-webpack": "^4.9.1",
     "husky": "^9.1.3",
diff --git a/test/__snapshots__/postcssOptions.test.js.snap b/test/__snapshots__/postcssOptions.test.js.snap
index 15d0c976..23b390d6 100644
--- a/test/__snapshots__/postcssOptions.test.js.snap
+++ b/test/__snapshots__/postcssOptions.test.js.snap
@@ -1,4 +1,4 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
 
 exports[`"postcssOptions" option should throw an error with "syntax" option on the unresolved syntax: errors 1`] = `
 [
@@ -500,7 +500,7 @@ exports[`"postcssOptions" option should work with the "config" options with "Str
   color: black
 }
 
-/*# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInN0eWxlLnNzcyJdLCJuYW1lcyI6W10sIm1hcHBpbmdzIjoiQUFBQTtFQUNFO0FBREYiLCJmaWxlIjoic3R5bGUuY3NzIiwic291cmNlc0NvbnRlbnQiOlsiYVxuICBjb2xvcjogYmxhY2tcbiJdfQ== */"
+/*# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInN0eWxlLnNzcyJdLCJuYW1lcyI6W10sIm1hcHBpbmdzIjoiQUFBQTtFQUNFO0FBREQiLCJmaWxlIjoic3R5bGUuY3NzIiwic291cmNlc0NvbnRlbnQiOlsiYVxuICBjb2xvcjogYmxhY2tcbiJdfQ== */"
 `;
 
 exports[`"postcssOptions" option should work with the "config" options with "String" value and respect all options: errors 1`] = `[]`;
diff --git a/test/__snapshots__/sourceMap.test.js.snap b/test/__snapshots__/sourceMap.test.js.snap
index 3e3393d0..9c7d7c21 100644
--- a/test/__snapshots__/sourceMap.test.js.snap
+++ b/test/__snapshots__/sourceMap.test.js.snap
@@ -162,7 +162,7 @@ exports[`"sourceMap" option should generate source maps when previous loader ret
 "a {
   color: coral;
 }
-"
+/*# sourceMappingURL=style.css.map */"
 `;
 
 exports[`"sourceMap" option should generate source maps when previous loader returns source maps ("less-loader"): errors 1`] = `[]`;
@@ -173,12 +173,10 @@ exports[`"sourceMap" option should generate source maps when previous loader ret
   "names": [],
   "sourceRoot": "",
   "sources": [
-    "less/style.less",
+    "../../style.less",
   ],
   "sourcesContent": [
-    "a {
-  color: coral;
-}
+    "a { color: coral }
 ",
   ],
   "version": 3,
diff --git a/test/__snapshots__/validate-options.test.js.snap b/test/__snapshots__/validate-options.test.js.snap
index 772beae5..f359e169 100644
--- a/test/__snapshots__/validate-options.test.js.snap
+++ b/test/__snapshots__/validate-options.test.js.snap
@@ -1,4 +1,4 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
 
 exports[`validate options should throw an error on the "execute" option with "/test/" value 1`] = `
 "Invalid options object. PostCSS Loader has been initialized using an options object that does not match the API schema.
diff --git a/test/sourceMap.test.js b/test/sourceMap.test.js
index 0175415b..c9fd26aa 100644
--- a/test/sourceMap.test.js
+++ b/test/sourceMap.test.js
@@ -432,9 +432,11 @@ describe('"sourceMap" option', () => {
     sourceMap.sources = sourceMap.sources.map((source) => {
       expect(path.isAbsolute(source)).toBe(true);
       expect(source).toBe(path.normalize(source));
-      expect(fs.existsSync(path.resolve(sourceMap.sourceRoot, source))).toBe(
-        true,
-      );
+      expect(
+        fs.existsSync(
+          path.resolve(__dirname, "./fixtures/less", path.basename(source)),
+        ),
+      ).toBe(true);
 
       return path
         .relative(path.resolve(__dirname, "./fixtures"), source)