diff --git a/package.json b/package.json
index 373c51776b4b..d18ee9bac3b3 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "espree": "^5.0.0",
     "esquery": "^1.0.1",
     "esutils": "^2.0.2",
-    "file-entry-cache": "^2.0.0",
+    "file-entry-cache": "^4.0.0",
     "functional-red-black-tree": "^1.0.1",
     "glob": "^7.1.2",
     "globals": "^11.7.0",
diff --git a/tests/lib/cli-engine.js b/tests/lib/cli-engine.js
index fd961cb63537..6b8c15a12747 100644
--- a/tests/lib/cli-engine.js
+++ b/tests/lib/cli-engine.js
@@ -21,6 +21,10 @@ const assert = require("chai").assert,
 
 const proxyquire = require("proxyquire").noCallThru().noPreserveCache();
 
+// Need use 'flatted' to parse the cache content as the 'file-entry-cache' use it to create cache
+// eslint-disable-next-line node/no-extraneous-require
+const flatted = require("flatted");
+
 //------------------------------------------------------------------------------
 // Tests
 //------------------------------------------------------------------------------
@@ -2375,7 +2379,7 @@ describe("CLIEngine", () => {
 
                 assert.isTrue(shell.test("-f", cacheFile), "the cache for eslint was created");
 
-                const cache = JSON.parse(fs.readFileSync(cacheFile));
+                const cache = flatted.parse(fs.readFileSync(cacheFile));
 
                 assert.isTrue(typeof cache[goodFile] === "object", "the entry for the good file is in the cache");
 
@@ -2412,7 +2416,7 @@ describe("CLIEngine", () => {
 
                 engine.executeOnFiles([badFile, goodFile, toBeDeletedFile]);
 
-                let cache = JSON.parse(fs.readFileSync(cacheFile));
+                let cache = flatted.parse(fs.readFileSync(cacheFile));
 
                 assert.isTrue(typeof cache[toBeDeletedFile] === "object", "the entry for the file to be deleted is in the cache");
 
@@ -2456,7 +2460,7 @@ describe("CLIEngine", () => {
 
                 engine.executeOnFiles([badFile, goodFile, testFile2]);
 
-                let cache = JSON.parse(fs.readFileSync(cacheFile));
+                let cache = flatted.parse(fs.readFileSync(cacheFile));
 
                 assert.isTrue(typeof cache[testFile2] === "object", "the entry for the test-file2 is in the cache");
 
@@ -2467,7 +2471,7 @@ describe("CLIEngine", () => {
                  */
                 engine.executeOnFiles([badFile, goodFile]);
 
-                cache = JSON.parse(fs.readFileSync(cacheFile));
+                cache = flatted.parse(fs.readFileSync(cacheFile));
 
                 assert.isTrue(typeof cache[testFile2] === "object", "the entry for the test-file2 is in the cache");
             });
@@ -2590,7 +2594,7 @@ describe("CLIEngine", () => {
 
                     assert.isTrue(shell.test("-f", customCacheFile), "the cache for eslint was created");
 
-                    const cache = JSON.parse(fs.readFileSync(customCacheFile));
+                    const cache = flatted.parse(fs.readFileSync(customCacheFile));
 
                     assert.isTrue(typeof cache[goodFile] === "object", "the entry for the good file is in the cache");