diff --git a/index.js b/index.js
index 77fa2b9ffde..f72ea8a540e 100644
--- a/index.js
+++ b/index.js
@@ -16,11 +16,11 @@ const MockClient = require('./lib/mock/mock-client')
 const MockAgent = require('./lib/mock/mock-agent')
 const MockPool = require('./lib/mock/mock-pool')
 const mockErrors = require('./lib/mock/mock-errors')
-const RetryHandler = require('./lib/handler/RetryHandler')
+const RetryHandler = require('./lib/handler/retry-handler')
 const { getGlobalDispatcher, setGlobalDispatcher } = require('./lib/global')
-const DecoratorHandler = require('./lib/handler/DecoratorHandler')
-const RedirectHandler = require('./lib/handler/RedirectHandler')
-const createRedirectInterceptor = require('./lib/interceptor/redirectInterceptor')
+const DecoratorHandler = require('./lib/handler/decorator-handler')
+const RedirectHandler = require('./lib/handler/redirect-handler')
+const createRedirectInterceptor = require('./lib/interceptor/redirect-interceptor')
 
 Object.assign(Dispatcher.prototype, api)
 
@@ -134,7 +134,7 @@ module.exports.getCookies = getCookies
 module.exports.getSetCookies = getSetCookies
 module.exports.setCookie = setCookie
 
-const { parseMIMEType, serializeAMimeType } = require('./lib/web/fetch/dataURL')
+const { parseMIMEType, serializeAMimeType } = require('./lib/web/fetch/data-url')
 
 module.exports.parseMIMEType = parseMIMEType
 module.exports.serializeAMimeType = serializeAMimeType
diff --git a/lib/dispatcher/agent.js b/lib/dispatcher/agent.js
index d91c412382f..98f1486cac0 100644
--- a/lib/dispatcher/agent.js
+++ b/lib/dispatcher/agent.js
@@ -6,7 +6,7 @@ const DispatcherBase = require('./dispatcher-base')
 const Pool = require('./pool')
 const Client = require('./client')
 const util = require('../core/util')
-const createRedirectInterceptor = require('../interceptor/redirectInterceptor')
+const createRedirectInterceptor = require('../interceptor/redirect-interceptor')
 
 const kOnConnect = Symbol('onConnect')
 const kOnDisconnect = Symbol('onDisconnect')
diff --git a/lib/dispatcher/client.js b/lib/dispatcher/client.js
index 29dde5cdab3..e7fb02fb34a 100644
--- a/lib/dispatcher/client.js
+++ b/lib/dispatcher/client.js
@@ -358,7 +358,7 @@ class Client extends DispatcherBase {
   }
 }
 
-const createRedirectInterceptor = require('../interceptor/redirectInterceptor.js')
+const createRedirectInterceptor = require('../interceptor/redirect-interceptor.js')
 
 function onError (client, err) {
   if (
diff --git a/lib/dispatcher/retry-agent.js b/lib/dispatcher/retry-agent.js
index 2ca82b0d02c..0c2120d6f26 100644
--- a/lib/dispatcher/retry-agent.js
+++ b/lib/dispatcher/retry-agent.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const Dispatcher = require('./dispatcher')
-const RetryHandler = require('../handler/RetryHandler')
+const RetryHandler = require('../handler/retry-handler')
 
 class RetryAgent extends Dispatcher {
   #agent = null
diff --git a/lib/handler/DecoratorHandler.js b/lib/handler/decorator-handler.js
similarity index 100%
rename from lib/handler/DecoratorHandler.js
rename to lib/handler/decorator-handler.js
diff --git a/lib/handler/RedirectHandler.js b/lib/handler/redirect-handler.js
similarity index 100%
rename from lib/handler/RedirectHandler.js
rename to lib/handler/redirect-handler.js
diff --git a/lib/handler/RetryHandler.js b/lib/handler/retry-handler.js
similarity index 100%
rename from lib/handler/RetryHandler.js
rename to lib/handler/retry-handler.js
diff --git a/lib/interceptor/redirectInterceptor.js b/lib/interceptor/redirect-interceptor.js
similarity index 90%
rename from lib/interceptor/redirectInterceptor.js
rename to lib/interceptor/redirect-interceptor.js
index 7cc035e096c..896ee8db939 100644
--- a/lib/interceptor/redirectInterceptor.js
+++ b/lib/interceptor/redirect-interceptor.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const RedirectHandler = require('../handler/RedirectHandler')
+const RedirectHandler = require('../handler/redirect-handler')
 
 function createRedirectInterceptor ({ maxRedirections: defaultMaxRedirections }) {
   return (dispatch) => {
diff --git a/lib/web/cache/util.js b/lib/web/cache/util.js
index d168d45351b..5ac9d846ddc 100644
--- a/lib/web/cache/util.js
+++ b/lib/web/cache/util.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const assert = require('node:assert')
-const { URLSerializer } = require('../fetch/dataURL')
+const { URLSerializer } = require('../fetch/data-url')
 const { isValidHeaderName } = require('../fetch/util')
 
 /**
diff --git a/lib/web/cookies/parse.js b/lib/web/cookies/parse.js
index 8d60d1cb69b..3c48c26b93f 100644
--- a/lib/web/cookies/parse.js
+++ b/lib/web/cookies/parse.js
@@ -2,7 +2,7 @@
 
 const { maxNameValuePairSize, maxAttributeValueSize } = require('./constants')
 const { isCTLExcludingHtab } = require('./util')
-const { collectASequenceOfCodePointsFast } = require('../fetch/dataURL')
+const { collectASequenceOfCodePointsFast } = require('../fetch/data-url')
 const assert = require('node:assert')
 
 /**
diff --git a/lib/web/eventsource/eventsource.js b/lib/web/eventsource/eventsource.js
index 6b34976e31b..cf5093e1bdf 100644
--- a/lib/web/eventsource/eventsource.js
+++ b/lib/web/eventsource/eventsource.js
@@ -6,7 +6,7 @@ const { makeRequest } = require('../fetch/request')
 const { getGlobalOrigin } = require('../fetch/global')
 const { webidl } = require('../fetch/webidl')
 const { EventSourceStream } = require('./eventsource-stream')
-const { parseMIMEType } = require('../fetch/dataURL')
+const { parseMIMEType } = require('../fetch/data-url')
 const { MessageEvent } = require('../websocket/events')
 const { isNetworkError } = require('../fetch/response')
 const { delay } = require('./util')
diff --git a/lib/web/fetch/body.js b/lib/web/fetch/body.js
index 4b81fcedc42..932df3e6532 100644
--- a/lib/web/fetch/body.js
+++ b/lib/web/fetch/body.js
@@ -19,7 +19,7 @@ const assert = require('node:assert')
 const { isErrored } = require('../../core/util')
 const { isArrayBuffer } = require('node:util/types')
 const { File: UndiciFile } = require('./file')
-const { serializeAMimeType } = require('./dataURL')
+const { serializeAMimeType } = require('./data-url')
 const { Readable } = require('node:stream')
 
 /** @type {globalThis['File']} */
diff --git a/lib/web/fetch/dataURL.js b/lib/web/fetch/data-url.js
similarity index 99%
rename from lib/web/fetch/dataURL.js
rename to lib/web/fetch/data-url.js
index ee7f72e9c93..a966ace3b8e 100644
--- a/lib/web/fetch/dataURL.js
+++ b/lib/web/fetch/data-url.js
@@ -1,3 +1,5 @@
+'use strict'
+
 const assert = require('node:assert')
 
 const encoder = new TextEncoder()
diff --git a/lib/web/fetch/file.js b/lib/web/fetch/file.js
index 61a232017b2..e00b58cdb58 100644
--- a/lib/web/fetch/file.js
+++ b/lib/web/fetch/file.js
@@ -5,7 +5,7 @@ const { types } = require('node:util')
 const { kState } = require('./symbols')
 const { isBlobLike } = require('./util')
 const { webidl } = require('./webidl')
-const { parseMIMEType, serializeAMimeType } = require('./dataURL')
+const { parseMIMEType, serializeAMimeType } = require('./data-url')
 const { kEnumerableProperty } = require('../../core/util')
 const encoder = new TextEncoder()
 
diff --git a/lib/web/fetch/index.js b/lib/web/fetch/index.js
index e7115b2e7e6..0ae6a704e11 100644
--- a/lib/web/fetch/index.js
+++ b/lib/web/fetch/index.js
@@ -60,7 +60,7 @@ const {
 const EE = require('node:events')
 const { Readable, pipeline } = require('node:stream')
 const { addAbortListener, isErrored, isReadable, nodeMajor, nodeMinor, bufferToLowerCasedHeaderName } = require('../../core/util')
-const { dataURLProcessor, serializeAMimeType, minimizeSupportedMimeType } = require('./dataURL')
+const { dataURLProcessor, serializeAMimeType, minimizeSupportedMimeType } = require('./data-url')
 const { getGlobalDispatcher } = require('../../global')
 const { webidl } = require('./webidl')
 const { STATUS_CODES } = require('node:http')
diff --git a/lib/web/fetch/request.js b/lib/web/fetch/request.js
index f8759626a1e..afe92499267 100644
--- a/lib/web/fetch/request.js
+++ b/lib/web/fetch/request.js
@@ -27,7 +27,7 @@ const { kEnumerableProperty } = util
 const { kHeaders, kSignal, kState, kGuard, kRealm, kDispatcher } = require('./symbols')
 const { webidl } = require('./webidl')
 const { getGlobalOrigin } = require('./global')
-const { URLSerializer } = require('./dataURL')
+const { URLSerializer } = require('./data-url')
 const { kHeadersList, kConstruct } = require('../../core/symbols')
 const assert = require('node:assert')
 const { getMaxListeners, setMaxListeners, getEventListeners, defaultMaxListeners } = require('node:events')
diff --git a/lib/web/fetch/response.js b/lib/web/fetch/response.js
index 355c2847aba..e31f619590f 100644
--- a/lib/web/fetch/response.js
+++ b/lib/web/fetch/response.js
@@ -21,7 +21,7 @@ const { kState, kHeaders, kGuard, kRealm } = require('./symbols')
 const { webidl } = require('./webidl')
 const { FormData } = require('./formdata')
 const { getGlobalOrigin } = require('./global')
-const { URLSerializer } = require('./dataURL')
+const { URLSerializer } = require('./data-url')
 const { kHeadersList, kConstruct } = require('../../core/symbols')
 const assert = require('node:assert')
 const { types } = require('node:util')
diff --git a/lib/web/fetch/util.js b/lib/web/fetch/util.js
index 49ab59e8876..92bcb6cb202 100644
--- a/lib/web/fetch/util.js
+++ b/lib/web/fetch/util.js
@@ -4,7 +4,7 @@ const { Transform } = require('node:stream')
 const zlib = require('node:zlib')
 const { redirectStatusSet, referrerPolicySet: referrerPolicyTokens, badPortsSet } = require('./constants')
 const { getGlobalOrigin } = require('./global')
-const { collectASequenceOfCodePoints, collectAnHTTPQuotedString, removeChars, parseMIMEType } = require('./dataURL')
+const { collectASequenceOfCodePoints, collectAnHTTPQuotedString, removeChars, parseMIMEType } = require('./data-url')
 const { performance } = require('node:perf_hooks')
 const { isBlobLike, ReadableStreamFrom, isValidHTTPToken } = require('../../core/util')
 const assert = require('node:assert')
diff --git a/lib/web/fileapi/util.js b/lib/web/fileapi/util.js
index ce8b10aa2de..9110b872a81 100644
--- a/lib/web/fileapi/util.js
+++ b/lib/web/fileapi/util.js
@@ -9,7 +9,7 @@ const {
 } = require('./symbols')
 const { ProgressEvent } = require('./progressevent')
 const { getEncoding } = require('./encoding')
-const { serializeAMimeType, parseMIMEType } = require('../fetch/dataURL')
+const { serializeAMimeType, parseMIMEType } = require('../fetch/data-url')
 const { types } = require('node:util')
 const { StringDecoder } = require('string_decoder')
 const { btoa } = require('node:buffer')
diff --git a/lib/web/websocket/websocket.js b/lib/web/websocket/websocket.js
index 0072da48193..c08f02cbe38 100644
--- a/lib/web/websocket/websocket.js
+++ b/lib/web/websocket/websocket.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const { webidl } = require('../fetch/webidl')
-const { URLSerializer } = require('../fetch/dataURL')
+const { URLSerializer } = require('../fetch/data-url')
 const { getGlobalOrigin } = require('../fetch/global')
 const { staticPropertyDescriptors, states, opcodes, emptyBuffer } = require('./constants')
 const {
diff --git a/test/fetch/data-uri.js b/test/fetch/data-uri.js
index 7c99c8e9422..feab3408d90 100644
--- a/test/fetch/data-uri.js
+++ b/test/fetch/data-uri.js
@@ -9,7 +9,7 @@ const {
   stringPercentDecode,
   parseMIMEType,
   collectAnHTTPQuotedString
-} = require('../../lib/web/fetch/dataURL')
+} = require('../../lib/web/fetch/data-url')
 const { fetch } = require('../..')
 
 test('https://url.spec.whatwg.org/#concept-url-serializer', async (t) => {
diff --git a/test/jest/interceptor.test.js b/test/jest/interceptor.test.js
index 9caa0758936..84e6210fb8d 100644
--- a/test/jest/interceptor.test.js
+++ b/test/jest/interceptor.test.js
@@ -2,7 +2,7 @@
 
 const { createServer } = require('node:http')
 const { Agent, request } = require('../../index')
-const DecoratorHandler = require('../../lib/handler/DecoratorHandler')
+const DecoratorHandler = require('../../lib/handler/decorator-handler')
 /* global expect */
 
 const defaultOpts = { keepAliveTimeout: 10, keepAliveMaxTimeout: 10 }