diff --git a/scripts/gha/integration_testing/xcodebuild.py b/scripts/gha/integration_testing/xcodebuild.py
index 1faa1e9c..27a97076 100644
--- a/scripts/gha/integration_testing/xcodebuild.py
+++ b/scripts/gha/integration_testing/xcodebuild.py
@@ -29,7 +29,25 @@
 """
 
 import os
+import re
 import shutil
+import subprocess
+
+
+def _get_xcode_version():
+  """Helper to determine major Xcode version."""
+  try:
+    result = subprocess.run(
+        ["xcodebuild", "-version"],
+        capture_output=True,
+        text=True,
+        check=True)
+    match = re.search(r"Xcode\s+(\d+)", result.stdout)
+    if match:
+      return int(match.group(1))
+  except Exception:
+    pass
+  return None
 
 
 def get_args_for_build(path, scheme, output_dir, ios_sdk, target_os, configuration):
@@ -55,6 +73,68 @@ def get_args_for_build(path, scheme, output_dir, ios_sdk, target_os, configurati
       "BUILD_DIR=" + output_dir
   ]
 
+  xcode_version = _get_xcode_version()
+  if xcode_version and xcode_version >= 16:
+    try:
+      import pwd
+      # Retrieve genuine home directory independent of temporary GHA shell overrides.
+      try:
+        real_home = pwd.getpwuid(os.getuid()).pw_dir
+      except Exception:
+        real_home = os.path.expanduser("~")
+
+      # Gather all preference directories to populate plists in.
+      pref_dirs = []
+      if real_home:
+        pref_dirs.append(os.path.join(real_home, "Library", "Preferences"))
+      env_home = os.environ.get("HOME")
+      if env_home:
+        pref_dirs.append(os.path.join(env_home, "Library", "Preferences"))
+
+      # Write directly to preference plist files.
+      for pref_dir in set(pref_dirs):
+        os.makedirs(pref_dir, exist_ok=True)
+        for filename in ["com.apple.dt.Xcode.plist", "com.apple.dt.xcodebuild.plist", ".GlobalPreferences.plist"]:
+          plist_path = os.path.join(pref_dir, filename)
+          subprocess.run(
+              ["defaults", "write", plist_path, "DisablePackageRepositorySandboxing", "-bool", "YES"],
+              check=True,
+              capture_output=True)
+          subprocess.run(
+              ["defaults", "write", plist_path, "IDEPackageSupportDisableSandboxing", "-bool", "YES"],
+              check=True,
+              capture_output=True)
+
+      # Write via standard macOS domains.
+      subprocess.run(
+          ["defaults", "write", "com.apple.dt.Xcode", "DisablePackageRepositorySandboxing", "-bool", "YES"],
+          check=True,
+          capture_output=True)
+      subprocess.run(
+          ["defaults", "write", "com.apple.dt.Xcode", "IDEPackageSupportDisableSandboxing", "-bool", "YES"],
+          check=True,
+          capture_output=True)
+
+      subprocess.run(
+          ["defaults", "write", "com.apple.dt.xcodebuild", "DisablePackageRepositorySandboxing", "-bool", "YES"],
+          check=True,
+          capture_output=True)
+      subprocess.run(
+          ["defaults", "write", "com.apple.dt.xcodebuild", "IDEPackageSupportDisableSandboxing", "-bool", "YES"],
+          check=True,
+          capture_output=True)
+
+      subprocess.run(
+          ["defaults", "write", "-g", "DisablePackageRepositorySandboxing", "-bool", "YES"],
+          check=True,
+          capture_output=True)
+      subprocess.run(
+          ["defaults", "write", "-g", "IDEPackageSupportDisableSandboxing", "-bool", "YES"],
+          check=True,
+          capture_output=True)
+    except Exception:
+      pass
+
   if ios_sdk == "device":
     args.extend(['CODE_SIGN_IDENTITY=""',
       "CODE_SIGNING_REQUIRED=NO",