diff --git a/lib/appenders/logstashHTTP.js b/lib/appenders/logstashHTTP.js
deleted file mode 100644
index b04862c..0000000
--- a/lib/appenders/logstashHTTP.js
+++ /dev/null
@@ -1,97 +0,0 @@
-/**
- * This appender is deprecated, please apply any bugfixes or changes
- * to https://github.com/log4js-node/logstash-http
- * logstashHTTP appender sends JSON formatted log events to logstashHTTP receivers.
- *
- * HTTP require 'axios', see 'https://www.npmjs.com/package/axios'
- *
- * Make sure your project have relevant dependancy installed before using this appender.
- */
-/* eslint global-require:0 */
-
-'use strict';
-
-const util = require('util');
-const axios = require('axios');
-
-/**
- *
- * For HTTP (browsers or node.js) use the following configuration params:
- *   {
- *      "type": "logstashHTTP",       // must be present for instantiation
- *      "application": "logstash-test",        // name of the application
- *      "logType": "application",        // type of the application
- *      "logChannel": "test",        // channel of the application
- *      "url": "http://lfs-server/_bulk",  // logstash receiver servlet URL
- *   }
- */
-function logstashHTTPAppender(config) {
-  const sender = axios.create({
-    baseURL: config.url,
-    timeout: config.timeout || 5000,
-    headers: { 'Content-Type': 'application/x-ndjson' },
-    withCredentials: true,
-  });
-
-  const appender = function log(event) {
-    const logstashEvent = [
-      {
-        index: {
-          _index: config.application,
-          _type: config.logType,
-        },
-      },
-      {
-        message: format(event.data), // eslint-disable-line
-        context: event.context,
-        level: event.level.level / 100,
-        level_name: event.level.levelStr,
-        channel: config.logChannel,
-        datetime: (new Date(event.startTime)).toISOString(),
-        extra: {},
-      },
-    ];
-    const logstashJSON = `${JSON.stringify(logstashEvent[0])}\n${JSON.stringify(logstashEvent[1])}\n`;
-
-    // send to server
-    sender.post('', logstashJSON)
-      .catch((error) => {
-        if (error.response) {
-          console.error(`log4js.logstashHTTP Appender error posting to ${config.url}: ${error.response.status} - ${error.response.data}`);
-          return;
-        }
-        console.error(`log4js.logstashHTTP Appender error: ${error.message}`);
-      });
-  };
-
-  appender.deprecated = '@log4js-node/logstash-http';
-
-  return appender;
-}
-
-function configure(config) {
-  return logstashHTTPAppender(config);
-}
-
-function format(logData) {
-  const data = Array.isArray(logData)
-    ? logData
-    : Array.prototype.slice.call(arguments);
-  return util.format.apply(util, wrapErrorsWithInspect(data));
-}
-
-function wrapErrorsWithInspect(items) {
-  return items.map((item) => {
-    if ((item instanceof Error) && item.stack) {
-      return {
-        inspect: function () {
-          return `${util.format(item)}\n${item.stack}`;
-        }
-      };
-    }
-
-    return item;
-  });
-}
-
-module.exports.configure = configure;
diff --git a/test/tap/logstashHTTP-test.js b/test/tap/logstashHTTP-test.js
deleted file mode 100644
index fde2ecd..0000000
--- a/test/tap/logstashHTTP-test.js
+++ /dev/null
@@ -1,115 +0,0 @@
-'use strict';
-
-const test = require('tap').test;
-const sandbox = require('@log4js-node/sandboxed-module');
-const appender = require('../../lib/appenders/logstashHTTP');
-
-function setupLogging(category, options) {
-  const fakeAxios = {
-    create: function (config) {
-      this.config = config;
-      return {
-        post: function (emptyString, event) {
-          fakeAxios.args = [emptyString, event];
-          return {
-            catch: function (cb) {
-              fakeAxios.errorCb = cb;
-            }
-          };
-        }
-      };
-    }
-  };
-
-  const fakeConsole = {
-    log: () => {},
-    error: function (msg) {
-      this.msg = msg;
-    }
-  };
-
-  const log4js = sandbox.require('../../lib/log4js', {
-    requires: {
-      axios: fakeAxios
-    },
-    globals: {
-      console: fakeConsole
-    }
-  });
-
-  options.type = 'logstashHTTP';
-  log4js.configure({
-    appenders: { http: options },
-    categories: { default: { appenders: ['http'], level: 'trace' } }
-  });
-
-  return {
-    logger: log4js.getLogger(category),
-    fakeAxios: fakeAxios,
-    fakeConsole: fakeConsole
-  };
-}
-
-test('logstashappender', (batch) => {
-  batch.test('should export a configure function', (t) => {
-    t.type(appender.configure, 'function');
-    t.end();
-  });
-
-  batch.test('when using HTTP receivers', (t) => {
-    const setup = setupLogging('myCategory', {
-      application: 'logstash-sample',
-      logType: 'application',
-      logChannel: 'sample',
-      url: 'http://localhost/receivers/rx1'
-    });
-
-    t.test('axios should be configured', (assert) => {
-      assert.equal(setup.fakeAxios.config.baseURL, 'http://localhost/receivers/rx1');
-      assert.equal(setup.fakeAxios.config.timeout, 5000);
-      assert.equal(setup.fakeAxios.config.withCredentials, true);
-      assert.same(setup.fakeAxios.config.headers, { 'Content-Type': 'application/x-ndjson' });
-      assert.end();
-    });
-
-    setup.logger.addContext('foo', 'bar');
-    setup.logger.addContext('bar', 'foo');
-    setup.logger.warn('Log event #1');
-
-    t.test('an event should be sent', (assert) => {
-      const packet = setup.fakeAxios.args[1].split('\n');
-      const eventHeader = JSON.parse(packet[0]);
-      const eventBody = JSON.parse(packet[1]);
-      assert.equal(eventHeader.index._index, 'logstash-sample');
-      assert.equal(eventHeader.index._type, 'application');
-
-      assert.equal(eventBody.channel, 'sample');
-      assert.equal(eventBody.message, 'Log event #1');
-      assert.equal(eventBody.level_name, 'WARN');
-      assert.equal(eventBody.context.foo, 'bar');
-      assert.equal(eventBody.context.bar, 'foo');
-
-      // Assert timestamp, up to hours resolution.
-      const date = new Date(eventBody.datetime);
-      assert.equal(
-        date.toISOString().substring(0, 14),
-        new Date().toISOString().substring(0, 14)
-      );
-      assert.end();
-    });
-
-    t.test('errors should be sent to console.error', (assert) => {
-      setup.fakeAxios.errorCb({ response: { status: 500, data: 'oh no' } });
-      assert.equal(
-        setup.fakeConsole.msg,
-        'log4js.logstashHTTP Appender error posting to http://localhost/receivers/rx1: 500 - oh no'
-      );
-      setup.fakeAxios.errorCb(new Error('oh dear'));
-      assert.equal(setup.fakeConsole.msg, 'log4js.logstashHTTP Appender error: oh dear');
-      assert.end();
-    });
-    t.end();
-  });
-
-  batch.end();
-});