diff --git a/fastify.js b/fastify.js
index 4efb4c2816..354a94158a 100644
--- a/fastify.js
+++ b/fastify.js
@@ -47,7 +47,7 @@ const { buildRouting, validateBodyLimitOption } = require('./lib/route')
 const build404 = require('./lib/fourOhFour')
 const getSecuredInitialConfig = require('./lib/initialConfigValidation')
 const override = require('./lib/pluginOverride')
-const warning = require('./lib/warnings')
+const { FSTDEP009 } = require('./lib/warnings')
 const noopSet = require('./lib/noop-set')
 const {
   appendStackTrace,
@@ -152,7 +152,7 @@ function fastify (options) {
 
   let constraints = options.constraints
   if (options.versioning) {
-    warning.emit('FSTDEP009')
+    FSTDEP009()
     constraints = {
       ...constraints,
       version: {
diff --git a/lib/decorate.js b/lib/decorate.js
index 2181c1c460..3fe7cc7b3f 100644
--- a/lib/decorate.js
+++ b/lib/decorate.js
@@ -16,7 +16,7 @@ const {
   FST_ERR_DEC_DEPENDENCY_INVALID_TYPE
 } = require('./errors')
 
-const warning = require('./warnings')
+const { FSTDEP006 } = require('./warnings')
 
 function decorate (instance, name, fn, dependencies) {
   if (Object.prototype.hasOwnProperty.call(instance, name)) {
@@ -58,7 +58,7 @@ function decorateConstructor (konstructor, name, fn, dependencies) {
 
 function checkReferenceType (name, fn) {
   if (typeof fn === 'object' && fn && !(typeof fn.getter === 'function' || typeof fn.setter === 'function')) {
-    warning.emit('FSTDEP006', name)
+    FSTDEP006(name)
   }
 }
 
diff --git a/lib/pluginUtils.js b/lib/pluginUtils.js
index 9429a40c7d..28ae84dbad 100644
--- a/lib/pluginUtils.js
+++ b/lib/pluginUtils.js
@@ -11,7 +11,7 @@ const {
   FST_ERR_PLUGIN_VERSION_MISMATCH,
   FST_ERR_PLUGIN_NOT_PRESENT_IN_INSTANCE
 } = require('./errors')
-const warning = require('./warnings.js')
+const { FSTWRN002 } = require('./warnings.js')
 
 function getMeta (fn) {
   return fn[Symbol.for('plugin-meta')]
@@ -138,7 +138,7 @@ function registerPluginName (fn) {
 
 function checkPluginHealthiness (fn, pluginName = 'anonymous') {
   if (fn.constructor.name === 'AsyncFunction' && fn.length === 3) {
-    warning.emit('FSTWRN002', pluginName)
+    FSTWRN002(pluginName)
   }
 }
 
diff --git a/lib/reply.js b/lib/reply.js
index b831bfca44..dfecb7ebd8 100644
--- a/lib/reply.js
+++ b/lib/reply.js
@@ -53,7 +53,7 @@ const {
   FST_ERR_MISSING_SERIALIZATION_FN,
   FST_ERR_MISSING_CONTENTTYPE_SERIALIZATION_FN
 } = require('./errors')
-const warning = require('./warnings')
+const { FSTDEP010, FSTDEP013, FSTDEP019 } = require('./warnings')
 
 function Reply (res, request, log) {
   this.raw = res
@@ -80,7 +80,7 @@ Object.defineProperties(Reply.prototype, {
   // Is temporary to avoid constant conflicts between `next` and `main`
   context: {
     get () {
-      warning.emit('FSTDEP019')
+      FSTDEP019()
       return this.request[kRouteContext]
     }
   },
@@ -96,7 +96,7 @@ Object.defineProperties(Reply.prototype, {
       return (this[kReplyHijacked] || this.raw.writableEnded) === true
     },
     set (value) {
-      warning.emit('FSTDEP010')
+      FSTDEP010()
 
       if (value !== true) {
         throw new FST_ERR_REP_SENT_VALUE()
@@ -748,7 +748,7 @@ function sendTrailer (payload, res, reply) {
       result.then((v) => cb(null, v), cb)
     } else if (result !== null && result !== undefined) {
       // TODO: should be removed in fastify@5
-      warning.emit('FSTDEP013')
+      FSTDEP013()
       cb(null, result)
     }
   }
diff --git a/lib/request.js b/lib/request.js
index 46c3174c23..d334099f0d 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -2,7 +2,14 @@
 
 const proxyAddr = require('proxy-addr')
 const semver = require('semver')
-const warning = require('./warnings')
+const {
+  FSTDEP005,
+  FSTDEP012,
+  FSTDEP015,
+  FSTDEP016,
+  FSTDEP017,
+  FSTDEP018
+} = require('./warnings')
 const {
   kHasBeenDecorated,
   kSchemaBody,
@@ -166,13 +173,13 @@ Object.defineProperties(Request.prototype, {
   },
   context: {
     get () {
-      warning.emit('FSTDEP012')
+      FSTDEP012()
       return this[kRouteContext]
     }
   },
   routerPath: {
     get () {
-      warning.emit('FSTDEP017')
+      FSTDEP017()
       return this[kRouteContext].config?.url
     }
   },
@@ -208,19 +215,19 @@ Object.defineProperties(Request.prototype, {
   },
   routerMethod: {
     get () {
-      warning.emit('FSTDEP018')
+      FSTDEP018()
       return this[kRouteContext].config?.method
     }
   },
   routeConfig: {
     get () {
-      warning.emit('FSTDEP016')
+      FSTDEP016()
       return this[kRouteContext][kPublicRouteContext]?.config
     }
   },
   routeSchema: {
     get () {
-      warning.emit('FSTDEP015')
+      FSTDEP015()
       return this[kRouteContext][kPublicRouteContext].schema
     }
   },
@@ -233,7 +240,7 @@ Object.defineProperties(Request.prototype, {
     get () {
       /* istanbul ignore next */
       if (semver.gte(process.versions.node, '13.0.0')) {
-        warning.emit('FSTDEP005')
+        FSTDEP005()
       }
       return this.raw.connection
     }
diff --git a/lib/route.js b/lib/route.js
index c1e36e6d99..61f47cd114 100644
--- a/lib/route.js
+++ b/lib/route.js
@@ -7,7 +7,11 @@ const { onRequestAbortHookRunner, lifecycleHooks, preParsingHookRunner, onTimeou
 const { supportedMethods } = require('./httpMethods')
 const { normalizeSchema } = require('./schemas')
 const { parseHeadOnSendHandlers } = require('./headRoute')
-const warning = require('./warnings')
+const {
+  FSTDEP007,
+  FSTDEP008,
+  FSTDEP014
+} = require('./warnings')
 
 const {
   compileSchemasForValidation,
@@ -100,11 +104,11 @@ function buildRouting (options) {
     hasRoute,
     prepareRoute,
     getDefaultRoute: function () {
-      warning.emit('FSTDEP014')
+      FSTDEP014()
       return router.defaultRoute
     },
     setDefaultRoute: function (defaultRoute) {
-      warning.emit('FSTDEP014')
+      FSTDEP014()
       if (typeof defaultRoute !== 'function') {
         throw new FST_ERR_DEFAULT_ROUTE_INVALID_TYPE()
       }
@@ -324,7 +328,7 @@ function buildRouting (options) {
       })
 
       if (opts.version) {
-        warning.emit('FSTDEP008')
+        FSTDEP008()
         constraints.version = opts.version
       }
 
@@ -417,7 +421,7 @@ function buildRouting (options) {
         const onSendHandlers = parseHeadOnSendHandlers(headOpts.onSend)
         prepareRoute.call(this, { method: 'HEAD', url: path, options: { ...headOpts, onSend: onSendHandlers }, isFastify: true })
       } else if (hasHEADHandler && exposeHeadRoute) {
-        warning.emit('FSTDEP007')
+        FSTDEP007()
       }
     }
   }
diff --git a/lib/server.js b/lib/server.js
index ed516e7b3f..1d7dec8210 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -4,7 +4,7 @@ const http = require('node:http')
 const https = require('node:https')
 const dns = require('node:dns')
 
-const warnings = require('./warnings')
+const { FSTDEP011 } = require('./warnings')
 const { kState, kOptions, kServerBindings } = require('./symbols')
 const { onListenHookRunner } = require('./hooks')
 const {
@@ -36,12 +36,12 @@ function createServer (options, httpHandler) {
     if (arguments.length === 0) {
       listenOptions = normalizeListenArgs([])
     } else if (arguments.length > 0 && (firstArgType !== '[object Object]' && firstArgType !== '[object Function]')) {
-      warnings.emit('FSTDEP011')
+      FSTDEP011()
       listenOptions = normalizeListenArgs(Array.from(arguments))
       cb = listenOptions.cb
     } else if (args.length > 1) {
       // `.listen(obj, a, ..., n, callback )`
-      warnings.emit('FSTDEP011')
+      FSTDEP011()
       // Deal with `.listen(port, host, backlog, [cb])`
       const hostPath = listenOptions.path ? [listenOptions.path] : [listenOptions.port ?? 0, listenOptions.host ?? 'localhost']
       Object.assign(listenOptions, normalizeListenArgs([...hostPath, ...args]))
diff --git a/lib/validation.js b/lib/validation.js
index fe684dff30..a83d948cbf 100644
--- a/lib/validation.js
+++ b/lib/validation.js
@@ -13,7 +13,7 @@ const {
   FST_ERR_SCH_RESPONSE_SCHEMA_NOT_NESTED_2XX
 } = require('./errors')
 
-const warning = require('./warnings')
+const { FSTWRN001 } = require('./warnings')
 
 function compileSchemasForSerialization (context, compile) {
   if (!context.schema || !context.schema.response) {
@@ -83,25 +83,25 @@ function compileSchemasForValidation (context, compile, isCustom) {
     }
     context[headersSchema] = compile({ schema: headersSchemaLowerCase, method, url, httpPart: 'headers' })
   } else if (Object.prototype.hasOwnProperty.call(schema, 'headers')) {
-    warning.emit('FSTWRN001', 'headers', method, url)
+    FSTWRN001('headers', method, url)
   }
 
   if (schema.body) {
     context[bodySchema] = compile({ schema: schema.body, method, url, httpPart: 'body' })
   } else if (Object.prototype.hasOwnProperty.call(schema, 'body')) {
-    warning.emit('FSTWRN001', 'body', method, url)
+    FSTWRN001('body', method, url)
   }
 
   if (schema.querystring) {
     context[querystringSchema] = compile({ schema: schema.querystring, method, url, httpPart: 'querystring' })
   } else if (Object.prototype.hasOwnProperty.call(schema, 'querystring')) {
-    warning.emit('FSTWRN001', 'querystring', method, url)
+    FSTWRN001('querystring', method, url)
   }
 
   if (schema.params) {
     context[paramsSchema] = compile({ schema: schema.params, method, url, httpPart: 'params' })
   } else if (Object.prototype.hasOwnProperty.call(schema, 'params')) {
-    warning.emit('FSTWRN001', 'params', method, url)
+    FSTWRN001('params', method, url)
   }
 }
 
diff --git a/lib/warnings.js b/lib/warnings.js
index 5ce1ad452e..609f73b5d7 100644
--- a/lib/warnings.js
+++ b/lib/warnings.js
@@ -1,60 +1,112 @@
 'use strict'
 
-const warning = require('process-warning')()
-
-/**
- * Deprecation codes:
- *   - FSTDEP005
- *   - FSTDEP006
- *   - FSTDEP007
- *   - FSTDEP008
- *   - FSTDEP009
- *   - FSTDEP010
- *   - FSTDEP011
- *   - FSTDEP012
- *   - FSTDEP013
- *   - FSTDEP014
- *   - FSTDEP015
- *   - FSTDEP016
- *   - FSTDEP017
- *   - FSTDEP018
- *   - FSTDEP019
- *   - FSTWRN001
- *   - FSTWRN002
- */
-
-warning.createDeprecation('FSTDEP005', 'You are accessing the deprecated "request.connection" property. Use "request.socket" instead.')
-
-warning.createDeprecation('FSTDEP006', 'You are decorating Request/Reply with a reference type. This reference is shared amongst all requests. Use onRequest hook instead. Property: %s')
-
-warning.createDeprecation('FSTDEP007', 'You are trying to set a HEAD route using "exposeHeadRoute" route flag when a sibling route is already set. See documentation for more info.')
-
-warning.createDeprecation('FSTDEP008', 'You are using route constraints via the route { version: "..." } option, use { constraints: { version: "..." } } option instead.')
-
-warning.createDeprecation('FSTDEP009', 'You are using a custom route versioning strategy via the server { versioning: "..." } option, use { constraints: { version: "..." } } option instead.')
-
-warning.createDeprecation('FSTDEP010', 'Modifying the "reply.sent" property is deprecated. Use the "reply.hijack()" method instead.')
-
-warning.createDeprecation('FSTDEP011', 'Variadic listen method is deprecated. Please use ".listen(optionsObject)" instead. The variadic signature will be removed in `fastify@5`.')
-
-warning.createDeprecation('FSTDEP012', 'request.context property access is deprecated. Please use "request.routeOptions.config" or "request.routeOptions.schema" instead for accessing Route settings. The "request.context" will be removed in `fastify@5`.')
-
-warning.createDeprecation('FSTDEP013', 'Direct return of "trailers" function is deprecated. Please use "callback" or "async-await" for return value. The support of direct return will removed in `fastify@5`.')
-
-warning.createDeprecation('FSTDEP014', 'You are trying to set/access the default route. This property is deprecated. Please, use setNotFoundHandler if you want to custom a 404 handler or the wildcard (*) to match all routes.')
-
-warning.createDeprecation('FSTDEP015', 'You are accessing the deprecated "request.routeSchema" property. Use "request.routeOptions.schema" instead. Property "req.routeSchema" will be removed in `fastify@5`.')
-
-warning.createDeprecation('FSTDEP016', 'You are accessing the deprecated "request.routeConfig" property. Use "request.routeOptions.config" instead. Property "req.routeConfig" will be removed in `fastify@5`.')
-
-warning.createDeprecation('FSTDEP017', 'You are accessing the deprecated "request.routerPath" property. Use "request.routeOptions.url" instead. Property "req.routerPath" will be removed in `fastify@5`.')
-
-warning.createDeprecation('FSTDEP018', 'You are accessing the deprecated "request.routerMethod" property. Use "request.routeOptions.method" instead. Property "req.routerMethod" will be removed in `fastify@5`.')
-
-warning.createDeprecation('FSTDEP019', 'reply.context property access is deprecated. Please use "request.routeOptions.config" or "request.routeOptions.schema" instead for accessing Route settings. The "reply.context" will be removed in `fastify@5`.')
-
-warning.create('FastifyWarning', 'FSTWRN001', 'The %s schema for %s: %s is missing. This may indicate the schema is not well specified.', { unlimited: true })
-
-warning.create('FastifyWarning', 'FSTWRN002', 'The %s plugin being registered mixes async and callback styles, which will result in an error in `fastify@5`', { unlimited: true })
-
-module.exports = warning
+const { createDeprecation, createWarning } = require('process-warning')
+
+const FSTDEP005 = createDeprecation({
+  code: 'FSTDEP005',
+  message: 'You are accessing the deprecated "request.connection" property. Use "request.socket" instead.'
+})
+
+const FSTDEP006 = createDeprecation({
+  code: 'FSTDEP006',
+  message: 'You are decorating Request/Reply with a reference type. This reference is shared amongst all requests. Use onRequest hook instead. Property: %s'
+})
+
+const FSTDEP007 = createDeprecation({
+  code: 'FSTDEP007',
+  message: 'You are trying to set a HEAD route using "exposeHeadRoute" route flag when a sibling route is already set. See documentation for more info.'
+})
+
+const FSTDEP008 = createDeprecation({
+  code: 'FSTDEP008',
+  message: 'You are using route constraints via the route { version: "..." } option, use { constraints: { version: "..." } } option instead.'
+})
+
+const FSTDEP009 = createDeprecation({
+  code: 'FSTDEP009',
+  message: 'You are using a custom route versioning strategy via the server { versioning: "..." } option, use { constraints: { version: "..." } } option instead.'
+})
+
+const FSTDEP010 = createDeprecation({
+  code: 'FSTDEP010',
+  message: 'Modifying the "reply.sent" property is deprecated. Use the "reply.hijack()" method instead.'
+})
+
+const FSTDEP011 = createDeprecation({
+  code: 'FSTDEP011',
+  message: 'Variadic listen method is deprecated. Please use ".listen(optionsObject)" instead. The variadic signature will be removed in `fastify@5`.'
+})
+
+const FSTDEP012 = createDeprecation({
+  code: 'FSTDEP012',
+  message: 'request.context property access is deprecated. Please use "request.routeOptions.config" or "request.routeOptions.schema" instead for accessing Route settings. The "request.context" will be removed in `fastify@5`.'
+})
+
+const FSTDEP013 = createDeprecation({
+  code: 'FSTDEP013',
+  message: 'Direct return of "trailers" function is deprecated. Please use "callback" or "async-await" for return value. The support of direct return will removed in `fastify@5`.'
+})
+
+const FSTDEP014 = createDeprecation({
+  code: 'FSTDEP014',
+  message: 'You are trying to set/access the default route. This property is deprecated. Please, use setNotFoundHandler if you want to custom a 404 handler or the wildcard (*) to match all routes.'
+})
+
+const FSTDEP015 = createDeprecation({
+  code: 'FSTDEP015',
+  message: 'You are accessing the deprecated "request.routeSchema" property. Use "request.routeOptions.schema" instead. Property "req.routeSchema" will be removed in `fastify@5`.'
+})
+
+const FSTDEP016 = createDeprecation({
+  code: 'FSTDEP016',
+  message: 'You are accessing the deprecated "request.routeConfig" property. Use "request.routeOptions.config" instead. Property "req.routeConfig" will be removed in `fastify@5`.'
+})
+
+const FSTDEP017 = createDeprecation({
+  code: 'FSTDEP017',
+  message: 'You are accessing the deprecated "request.routerPath" property. Use "request.routeOptions.url" instead. Property "req.routerPath" will be removed in `fastify@5`.'
+})
+
+const FSTDEP018 = createDeprecation({
+  code: 'FSTDEP018',
+  message: 'You are accessing the deprecated "request.routerMethod" property. Use "request.routeOptions.method" instead. Property "req.routerMethod" will be removed in `fastify@5`.'
+})
+
+const FSTDEP019 = createDeprecation({
+  code: 'FSTDEP019',
+  message: 'reply.context property access is deprecated. Please use "request.routeOptions.config" or "request.routeOptions.schema" instead for accessing Route settings. The "reply.context" will be removed in `fastify@5`.'
+})
+
+const FSTWRN001 = createWarning({
+  name: 'FastifyWarning',
+  code: 'FSTWRN001',
+  message: 'The %s schema for %s: %s is missing. This may indicate the schema is not well specified.',
+  unlimited: true
+})
+
+const FSTWRN002 = createWarning({
+  name: 'FastifyWarning',
+  code: 'FSTWRN002',
+  message: 'The %s plugin being registered mixes async and callback styles, which will result in an error in `fastify@5`',
+  unlimited: true
+})
+
+module.exports = {
+  FSTDEP005,
+  FSTDEP006,
+  FSTDEP007,
+  FSTDEP008,
+  FSTDEP009,
+  FSTDEP010,
+  FSTDEP011,
+  FSTDEP012,
+  FSTDEP013,
+  FSTDEP014,
+  FSTDEP015,
+  FSTDEP016,
+  FSTDEP017,
+  FSTDEP018,
+  FSTDEP019,
+  FSTWRN001,
+  FSTWRN002
+}
diff --git a/package.json b/package.json
index 3fd2e80cf7..84863318a8 100644
--- a/package.json
+++ b/package.json
@@ -198,7 +198,7 @@
     "find-my-way": "^7.7.0",
     "light-my-request": "^5.11.0",
     "pino": "^8.16.0",
-    "process-warning": "^2.3.0",
+    "process-warning": "^3.0.0",
     "proxy-addr": "^2.0.7",
     "rfdc": "^1.3.0",
     "secure-json-parse": "^2.7.0",
diff --git a/test/decorator.test.js b/test/decorator.test.js
index d36e756839..f16ba772fb 100644
--- a/test/decorator.test.js
+++ b/test/decorator.test.js
@@ -790,31 +790,33 @@ test('decorate* should throw if called after ready', async t => {
 })
 
 test('decorate* should emit warning if an array is passed', t => {
-  t.plan(2)
-  function onWarning (code, name) {
+  t.plan(1)
+
+  function onWarning (name) {
     t.equal(name, 'test_array')
-    t.equal(code, 'FSTDEP006')
-  }
-  const warning = {
-    emit: onWarning
   }
 
-  const decorate = proxyquire('../lib/decorate', { './warnings': warning })
+  const decorate = proxyquire('../lib/decorate', {
+    './warnings': {
+      FSTDEP006: onWarning
+    }
+  })
   const fastify = proxyquire('..', { './lib/decorate.js': decorate })()
   fastify.decorateRequest('test_array', [])
 })
 
 test('decorate* should emit warning if object type is passed', t => {
-  t.plan(2)
-  function onWarning (code, name) {
+  t.plan(1)
+
+  function onWarning (name) {
     t.equal(name, 'test_object')
-    t.equal(code, 'FSTDEP006')
-  }
-  const warning = {
-    emit: onWarning
   }
 
-  const decorate = proxyquire('../lib/decorate', { './warnings': warning })
+  const decorate = proxyquire('../lib/decorate', {
+    './warnings': {
+      FSTDEP006: onWarning
+    }
+  })
   const fastify = proxyquire('..', { './lib/decorate.js': decorate })()
   fastify.decorateRequest('test_object', { foo: 'bar' })
 })
@@ -823,10 +825,12 @@ test('decorate* should not emit warning if object with getter/setter is passed',
   function onWarning (warning) {
     t.fail('Should not call a warn')
   }
-  const warning = {
-    emit: onWarning
-  }
-  const decorate = proxyquire('../lib/decorate', { './warnings': warning })
+
+  const decorate = proxyquire('../lib/decorate', {
+    './warnings': {
+      FSTDEP006: onWarning
+    }
+  })
   const fastify = proxyquire('..', { './lib/decorate.js': decorate })()
 
   fastify.decorateRequest('test_getter_setter', {
@@ -844,11 +848,12 @@ test('decorate* should not emit warning if string,bool,numbers are passed', t =>
   function onWarning (warning) {
     t.fail('Should not call a warn')
   }
-  const warning = {
-    emit: onWarning
-  }
 
-  const decorate = proxyquire('../lib/decorate', { './warnings': warning })
+  const decorate = proxyquire('../lib/decorate', {
+    './warnings': {
+      FSTDEP006: onWarning
+    }
+  })
   const fastify = proxyquire('..', { './lib/decorate.js': decorate })()
 
   fastify.decorateRequest('test_str', 'foo')
diff --git a/test/default-route.test.js b/test/default-route.test.js
index fda35b940f..78557385e7 100644
--- a/test/default-route.test.js
+++ b/test/default-route.test.js
@@ -3,7 +3,7 @@
 const t = require('tap')
 const test = t.test
 const Fastify = require('..')
-const warning = require('../lib/warnings')
+const { FSTDEP014 } = require('../lib/warnings')
 
 // Silence the standard warning logs. We will test the messages explicitly.
 process.removeAllListeners('warning')
@@ -19,12 +19,12 @@ test('setDefaultRoute should emit a deprecation warning', t => {
   process.on('warning', onWarning)
   function onWarning (warning) {
     t.equal(warning.name, 'DeprecationWarning')
-    t.equal(warning.code, 'FSTDEP014')
+    t.equal(warning.code, FSTDEP014.code)
   }
 
   t.teardown(() => {
     process.removeListener('warning', onWarning)
-    warning.emitted.set('FSTDEP014', false)
+    FSTDEP014.emitted = false
   })
 
   fastify.setDefaultRoute(defaultRoute)
@@ -38,12 +38,12 @@ test('getDefaultRoute should emit a deprecation warning', t => {
   process.on('warning', onWarning)
   function onWarning (warning) {
     t.equal(warning.name, 'DeprecationWarning')
-    t.equal(warning.code, 'FSTDEP014')
+    t.equal(warning.code, FSTDEP014.code)
   }
 
   t.teardown(() => {
     process.removeListener('warning', onWarning)
-    warning.emitted.set('FSTDEP014', false)
+    FSTDEP014.emitted = false
   })
 
   fastify.getDefaultRoute()
diff --git a/test/internals/reply.test.js b/test/internals/reply.test.js
index 72aff8aa3b..cfd40c015e 100644
--- a/test/internals/reply.test.js
+++ b/test/internals/reply.test.js
@@ -19,7 +19,7 @@ const {
 } = require('../../lib/symbols')
 const fs = require('node:fs')
 const path = require('node:path')
-const warning = require('../../lib/warnings')
+const { FSTDEP019, FSTDEP010 } = require('../../lib/warnings')
 
 const agent = new http.Agent({ keepAlive: false })
 
@@ -1466,14 +1466,13 @@ test('should emit deprecation warning when trying to modify the reply.sent prope
   t.plan(4)
   const fastify = Fastify()
 
-  const deprecationCode = 'FSTDEP010'
-  warning.emitted.delete(deprecationCode)
+  FSTDEP010.emitted = false
 
   process.removeAllListeners('warning')
   process.on('warning', onWarning)
   function onWarning (warning) {
     t.equal(warning.name, 'DeprecationWarning')
-    t.equal(warning.code, deprecationCode)
+    t.equal(warning.code, FSTDEP010.code)
   }
 
   fastify.get('/', (req, reply) => {
@@ -1494,14 +1493,13 @@ test('should emit deprecation warning when trying to use the reply.context.confi
   t.plan(4)
   const fastify = Fastify()
 
-  const deprecationCode = 'FSTDEP019'
-  warning.emitted.delete(deprecationCode)
+  FSTDEP019.emitted = false
 
   process.removeAllListeners('warning')
   process.on('warning', onWarning)
   function onWarning (warning) {
     t.equal(warning.name, 'DeprecationWarning')
-    t.equal(warning.code, deprecationCode)
+    t.equal(warning.code, FSTDEP019.code)
   }
 
   fastify.get('/', (req, reply) => {
diff --git a/test/route.7.test.js b/test/route.7.test.js
index aeacecf2a6..536eec5670 100644
--- a/test/route.7.test.js
+++ b/test/route.7.test.js
@@ -178,14 +178,15 @@ test('Set a custom HEAD route before GET one without disabling exposeHeadRoutes
 test('Set a custom HEAD route before GET one without disabling exposeHeadRoutes (route)', t => {
   t.plan(7)
 
-  function onWarning (code) {
-    t.equal(code, 'FSTDEP007')
-  }
-  const warning = {
-    emit: onWarning
+  function onWarning () {
+    t.pass('warning emitted')
   }
 
-  const route = proxyquire('../lib/route', { './warnings': warning })
+  const route = proxyquire('../lib/route', {
+    './warnings': {
+      FSTDEP007: onWarning
+    }
+  })
   const fastify = proxyquire('..', { './lib/route.js': route })()
 
   const resBuffer = Buffer.from('I am a coffee!')
diff --git a/test/schema-feature.test.js b/test/schema-feature.test.js
index 6cc9df2949..8bf208ed31 100644
--- a/test/schema-feature.test.js
+++ b/test/schema-feature.test.js
@@ -6,7 +6,7 @@ const fp = require('fastify-plugin')
 const deepClone = require('rfdc')({ circles: true, proto: false })
 const Ajv = require('ajv')
 const { kSchemaController } = require('../lib/symbols.js')
-const warning = require('../lib/warnings')
+const { FSTWRN001 } = require('../lib/warnings')
 
 const echoParams = (req, reply) => { reply.send(req.params) }
 const echoBody = (req, reply) => { reply.send(req.body) }
@@ -261,12 +261,12 @@ test('Should emit warning if the schema headers is undefined', t => {
   process.on('warning', onWarning)
   function onWarning (warning) {
     t.equal(warning.name, 'FastifyWarning')
-    t.equal(warning.code, 'FSTWRN001')
+    t.equal(warning.code, FSTWRN001.code)
   }
 
   t.teardown(() => {
     process.removeListener('warning', onWarning)
-    warning.emitted.set('FSTWRN001', false)
+    FSTWRN001.emitted = false
   })
 
   fastify.post('/:id', {
@@ -292,12 +292,12 @@ test('Should emit warning if the schema body is undefined', t => {
   process.on('warning', onWarning)
   function onWarning (warning) {
     t.equal(warning.name, 'FastifyWarning')
-    t.equal(warning.code, 'FSTWRN001')
+    t.equal(warning.code, FSTWRN001.code)
   }
 
   t.teardown(() => {
     process.removeListener('warning', onWarning)
-    warning.emitted.set('FSTWRN001', false)
+    FSTWRN001.emitted = false
   })
 
   fastify.post('/:id', {
@@ -323,12 +323,12 @@ test('Should emit warning if the schema query is undefined', t => {
   process.on('warning', onWarning)
   function onWarning (warning) {
     t.equal(warning.name, 'FastifyWarning')
-    t.equal(warning.code, 'FSTWRN001')
+    t.equal(warning.code, FSTWRN001.code)
   }
 
   t.teardown(() => {
     process.removeListener('warning', onWarning)
-    warning.emitted.set('FSTWRN001', false)
+    FSTWRN001.emitted = false
   })
 
   fastify.post('/:id', {
@@ -354,12 +354,12 @@ test('Should emit warning if the schema params is undefined', t => {
   process.on('warning', onWarning)
   function onWarning (warning) {
     t.equal(warning.name, 'FastifyWarning')
-    t.equal(warning.code, 'FSTWRN001')
+    t.equal(warning.code, FSTWRN001.code)
   }
 
   t.teardown(() => {
     process.removeListener('warning', onWarning)
-    warning.emitted.set('FSTWRN001', false)
+    FSTWRN001.emitted = false
   })
 
   fastify.post('/:id', {
@@ -390,14 +390,14 @@ test('Should emit a warning for every route with undefined schema', t => {
   // => 3 x 4 assertions = 12 assertions
   function onWarning (warning) {
     t.equal(warning.name, 'FastifyWarning')
-    t.equal(warning.code, 'FSTWRN001')
+    t.equal(warning.code, FSTWRN001.code)
     t.equal(runs++, expectedWarningEmitted.shift())
   }
 
   process.on('warning', onWarning)
   t.teardown(() => {
     process.removeListener('warning', onWarning)
-    warning.emitted.set('FSTWRN001', false)
+    FSTWRN001.emitted = false
   })
 
   fastify.get('/undefinedParams/:id', {
diff --git a/test/versioned-routes.test.js b/test/versioned-routes.test.js
index 25954dcb03..7d1e39ae67 100644
--- a/test/versioned-routes.test.js
+++ b/test/versioned-routes.test.js
@@ -663,14 +663,15 @@ test('Vary header check (for documentation example)', t => {
 test('Should trigger a warning when a versioned route is registered via version option', t => {
   t.plan(4)
 
-  function onWarning (code) {
-    t.equal(code, 'FSTDEP008')
-  }
-  const warning = {
-    emit: onWarning
+  function onWarning () {
+    t.pass('FSTDEP008 has been emitted')
   }
 
-  const route = proxyquire('../lib/route', { './warnings': warning })
+  const route = proxyquire('../lib/route', {
+    './warnings': {
+      FSTDEP008: onWarning
+    }
+  })
   const fastify = proxyquire('..', { './lib/route.js': route })({ exposeHeadRoutes: false })
 
   fastify.route({