diff --git a/packages/react-native-cli/src/lib/Xcode.ts b/packages/react-native-cli/src/lib/Xcode.ts
index e7d77c232d..dc7adc5e41 100644
--- a/packages/react-native-cli/src/lib/Xcode.ts
+++ b/packages/react-native-cli/src/lib/Xcode.ts
@@ -6,10 +6,7 @@ import xcode, { Project } from 'xcode'
 const DOCS_LINK = 'https://docs.bugsnag.com/platforms/react-native/react-native/showing-full-stacktraces/#ios'
 const UNLOCATED_PROJ_MSG = `The Xcode project was not in the expected location and so couldn't be updated automatically.
 
-Update the "Bundle React Native Code And Images" build phase with the following environment variables:
-export EXTRA_PACKAGER_ARGS="--sourcemap-output $TMPDIR/$(md5 -qs "$CONFIGURATION_BUILD_DIR")-main.jsbundle.map""
-
-See ${DOCS_LINK} for more information`
+Please see ${DOCS_LINK} for more information`
 
 const EXTRA_PACKAGER_ARGS = ['$(SRCROOT)/.xcode.env.local', '$(SRCROOT)/.xcode.env']
 
@@ -36,10 +33,11 @@ export async function updateXcodeProject (projectRoot: string, endpoint: string|
   logger.info('Ensuring React Native build phase outputs source maps')
 
   const didUpdate = await updateBuildReactNativeTask(buildPhaseMap, logger)
+  const didUpdateEnv = await updateXcodeEnv(iosDir, logger)
   logger.info('Adding build phase to upload source maps to Bugsnag')
 
   const didAdd = await addUploadSourceMapsTask(proj, buildPhaseMap, endpoint, logger)
-  const didChange = didUpdate || didAdd
+  const didChange = didUpdate || didAdd || didUpdateEnv
 
   if (!didChange) return
 
@@ -76,17 +74,13 @@ async function addUploadSourceMapsTask (
 ): Promise<boolean> {
   for (const shellBuildPhaseKey in buildPhaseMap) {
     const phase = buildPhaseMap[shellBuildPhaseKey]
-    if (typeof phase.shellScript === 'string' && phase.shellScript.includes('bugsnag-react-native-xcode.sh')) {
+    if (typeof phase.shellScript === 'string' && (phase.shellScript.includes('bugsnag-react-native-xcode.sh') || phase.shellScript.includes('npm run bugsnag:upload-ios'))) {
       logger.warn('An "Upload source maps to Bugsnag" build phase already exists')
       return false
     }
   }
 
-  let shellScript = 'SOURCE_MAP="$TMPDIR/$(md5 -qs "$CONFIGURATION_BUILD_DIR")-main.jsbundle.map" ../node_modules/@bugsnag/react-native/bugsnag-react-native-xcode.sh'
-
-  if (endpoint) {
-    shellScript = `export ENDPOINT='${endpoint}'\\n${shellScript}`
-  }
+  const shellScript = 'npm run bugsnag:upload-ios'
 
   proj.addBuildPhase(
     [],
@@ -110,3 +104,38 @@ function addExtraPackagerArgs (phaseId: string, existingInputFiles: string[], lo
 function arrayContainsElements (mainArray: any[], subArray: any[]): boolean {
   return subArray.every(element => mainArray.some(mainElement => mainElement === element))
 }
+
+async function updateXcodeEnv (iosDir: string, logger: Logger): Promise<boolean> {
+  const searchString = 'SOURCEMAP_FILE='
+  const sourceMapFilePath = 'ios/build/sourcemaps/main.jsbundle.map'
+  const envFilePath = path.join(iosDir, '.xcode.env')
+
+  try {
+    // Check if the file exists
+    await fs.stat(envFilePath)
+
+    // If the file exists, read its content
+    const xcodeEnvData = await fs.readFile(envFilePath, 'utf8')
+
+    if (xcodeEnvData.includes(searchString)) {
+      logger.warn(`The .xcode.env file already contains a section for "${searchString}"`)
+      return false
+    } else {
+      // Append the new data to the existing content
+      const newData = `${xcodeEnvData}\n\n# React Native Source Map File\nexport ${searchString}${sourceMapFilePath}`
+      await fs.writeFile(envFilePath, newData, 'utf8')
+      return true
+    }
+  } catch (error) {
+    // If the file doesn't exist, create it
+    if (error.code === 'ENOENT') {
+      const newData = `export NODE_BINARY=$(command -v node)\n# React Native Source Map File\nexport ${searchString}${sourceMapFilePath}`
+      await fs.writeFile(envFilePath, newData, 'utf8')
+      return true
+    } else {
+      // Other error occurred
+      console.error(`Error updating .xcode.env file: ${error.message}`)
+      return false
+    }
+  }
+}