diff --git a/package-lock.json b/package-lock.json
index 0a63dce..0538a17 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1098,13 +1098,10 @@
       }
     },
     "eslint-config-prettier": {
-      "version": "6.15.0",
-      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-6.15.0.tgz",
-      "integrity": "sha512-a1+kOYLR8wMGustcgAjdydMsQ2A/2ipRPwRKUmfYaSxc9ZPcrku080Ctl6zrZzZNs/U82MjSv+qKREkoq3bJaw==",
-      "dev": true,
-      "requires": {
-        "get-stdin": "^6.0.0"
-      }
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-8.3.0.tgz",
+      "integrity": "sha512-BgZuLUSeKzvlL/VUjx/Yb787VQ26RU3gGjA3iiFvdsp/2bMfVIWUVP7tjxtjS0e+HP409cPlPvNkQloz8C91ew==",
+      "dev": true
     },
     "eslint-import-resolver-node": {
       "version": "0.3.6",
@@ -1717,12 +1714,6 @@
         }
       }
     },
-    "get-stdin": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-6.0.0.tgz",
-      "integrity": "sha512-jp4tHawyV7+fkkSKyvjuLZswblUtz+SQKzSWnBbii16BuZksJlU1wuBYXY75r+duh/llF1ur6oNwi+2ZzjKZ7g==",
-      "dev": true
-    },
     "get-stream": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz",
diff --git a/package.json b/package.json
index d98cdab..f99a62a 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "deep-freeze": "0.0.1",
     "eslint": "^5.16.0",
     "eslint-config-airbnb-base": "^13.2.0",
-    "eslint-config-prettier": "^6.15.0",
+    "eslint-config-prettier": "^8.3.0",
     "eslint-import-resolver-node": "^0.3.6",
     "eslint-plugin-import": "^2.25.4",
     "eslint-plugin-prettier": "^3.4.1",
diff --git a/test/tap/file-sighup-test.js b/test/tap/file-sighup-test.js
index 0627532..298b547 100644
--- a/test/tap/file-sighup-test.js
+++ b/test/tap/file-sighup-test.js
@@ -6,9 +6,7 @@ const sandbox = require("@log4js-node/sandboxed-module");
 const removeFiles = async filenames => {
   if (!Array.isArray(filenames))
     filenames = [filenames];
-  const promises = filenames.map(filename => {
-    return fs.promises.unlink(filename);
-  });
+  const promises = filenames.map(filename => fs.promises.unlink(filename));
   await Promise.allSettled(promises);
 };
 
@@ -43,9 +41,7 @@ test("file appender single SIGHUP handler", t => {
   t.teardown(async () => {
     log4js.shutdown();
 
-    const filenames = Object.values(config.appenders).map(appender => {
-      return appender.filename;
-    });
+    const filenames = Object.values(config.appenders).map(appender => appender.filename);
     await removeFiles(filenames);
 
     process.off("warning", warningListener);
diff --git a/test/tap/tcp-appender-test.js b/test/tap/tcp-appender-test.js
index 0f855fd..e61255f 100644
--- a/test/tap/tcp-appender-test.js
+++ b/test/tap/tcp-appender-test.js
@@ -33,7 +33,7 @@ test("TCP Appender", batch => {
 
     const serverConfig = {
       endMsg: "__LOG4JS__",
-      deserialise: (log) => { return LoggingEvent.deserialise(log); }
+      deserialise: (log) => LoggingEvent.deserialise(log)
     }
     server = makeServer(serverConfig);
 
@@ -78,7 +78,7 @@ test("TCP Appender", batch => {
 
     const serverConfig = {
       endMsg: "\n",
-      deserialise: (log) => { return LoggingEvent.deserialise(log); }
+      deserialise: (log) => LoggingEvent.deserialise(log)
     }
     server = makeServer(serverConfig);
 
@@ -124,18 +124,16 @@ test("TCP Appender", batch => {
 
     const serverConfig = {
       endMsg: "__LOG4JS__",
-      deserialise: (log) => { return JSON.parse(log); }
+      deserialise: (log) => JSON.parse(log)
     }
     server = makeServer(serverConfig);
 
-    log4js.addLayout('json', function () {
-      return function (logEvent) {
-        return JSON.stringify({
-          "time": logEvent.startTime,
-          "message": logEvent.data[0],
-          "level": logEvent.level.toString()
-        });
-      }
+    log4js.addLayout('json', () => function (logEvent) {
+      return JSON.stringify({
+        "time": logEvent.startTime,
+        "message": logEvent.data[0],
+        "level": logEvent.level.toString()
+      });
     });
 
     server.listen(() => {