diff --git a/lib/xcodeproj/constants.rb b/lib/xcodeproj/constants.rb
index 543a7b2f..8935b6bd 100644
--- a/lib/xcodeproj/constants.rb
+++ b/lib/xcodeproj/constants.rb
@@ -36,7 +36,7 @@ module Constants
 
     # @return [String] The last known object version to Xcodeproj.
     #
-    LAST_KNOWN_OBJECT_VERSION = 63
+    LAST_KNOWN_OBJECT_VERSION = 77
 
     # @return [String] The last known Xcode version to Xcodeproj.
     #
@@ -132,6 +132,7 @@ module Constants
     # @return [Hash] The compatibility version string for different object versions.
     #
     COMPATIBILITY_VERSION_BY_OBJECT_VERSION = {
+      77 => 'Xcode 16.0',
       63 => 'Xcode 15.3',
       60 => 'Xcode 15.0',
       56 => 'Xcode 14.0',
diff --git a/lib/xcodeproj/project/object.rb b/lib/xcodeproj/project/object.rb
index 8d2ecf0e..bdfaa214 100644
--- a/lib/xcodeproj/project/object.rb
+++ b/lib/xcodeproj/project/object.rb
@@ -533,3 +533,5 @@ def inspect
 require 'xcodeproj/project/object/root_object'
 require 'xcodeproj/project/object/target_dependency'
 require 'xcodeproj/project/object/reference_proxy'
+require 'xcodeproj/project/object/file_system_synchronized_root_group'
+require 'xcodeproj/project/object/file_system_synchronized_build_file_exception_set'
diff --git a/lib/xcodeproj/project/object/file_system_synchronized_build_file_exception_set.rb b/lib/xcodeproj/project/object/file_system_synchronized_build_file_exception_set.rb
new file mode 100644
index 00000000..e3ec498a
--- /dev/null
+++ b/lib/xcodeproj/project/object/file_system_synchronized_build_file_exception_set.rb
@@ -0,0 +1,18 @@
+require 'xcodeproj/project/object_attributes'
+require 'xcodeproj/project/object/helpers/groupable_helper'
+
+module Xcodeproj
+  class Project
+    module Object
+      # This class represents a file system synchronized build file exception set.
+      class PBXFileSystemSynchronizedBuildFileExceptionSet < AbstractObject
+        has_one :target, AbstractTarget
+        attribute :membership_exceptions, Array
+
+        def display_name
+          "Exceptions for \"#{GroupableHelper.parent(self).display_name}\" folder in \"#{target.name}\" target"
+        end
+      end
+    end
+  end
+end
diff --git a/lib/xcodeproj/project/object/file_system_synchronized_root_group.rb b/lib/xcodeproj/project/object/file_system_synchronized_root_group.rb
new file mode 100644
index 00000000..5832ba97
--- /dev/null
+++ b/lib/xcodeproj/project/object/file_system_synchronized_root_group.rb
@@ -0,0 +1,19 @@
+require 'xcodeproj/project/object/file_system_synchronized_build_file_exception_set'
+
+module Xcodeproj
+  class Project
+    module Object
+      # This class represents a file system synchronized root group.
+      class PBXFileSystemSynchronizedRootGroup < AbstractObject
+        attribute :path, String
+        attribute :source_tree, String, 'group'
+        has_many :exceptions, PBXFileSystemSynchronizedBuildFileExceptionSet
+
+        def display_name
+          return path if path
+          super
+        end
+      end
+    end
+  end
+end
diff --git a/lib/xcodeproj/project/object/group.rb b/lib/xcodeproj/project/object/group.rb
index 7571eadd..51902dd3 100644
--- a/lib/xcodeproj/project/object/group.rb
+++ b/lib/xcodeproj/project/object/group.rb
@@ -1,5 +1,6 @@
 require 'xcodeproj/project/object/helpers/groupable_helper'
 require 'xcodeproj/project/object/helpers/file_references_factory'
+require 'xcodeproj/project/object/file_system_synchronized_root_group'
 
 module Xcodeproj
   class Project
@@ -13,7 +14,7 @@ class PBXGroup < AbstractObject
         # @return [ObjectList<PBXGroup, PBXFileReference>]
         #         the objects contained by the group.
         #
-        has_many :children, [PBXGroup, PBXFileReference, PBXReferenceProxy]
+        has_many :children, [PBXGroup, PBXFileReference, PBXReferenceProxy, PBXFileSystemSynchronizedRootGroup]
 
         # @return [String] the directory to which the path is relative.
         #
diff --git a/lib/xcodeproj/project/object/native_target.rb b/lib/xcodeproj/project/object/native_target.rb
index 87294ae2..f0635c63 100644
--- a/lib/xcodeproj/project/object/native_target.rb
+++ b/lib/xcodeproj/project/object/native_target.rb
@@ -29,6 +29,8 @@ class AbstractTarget < AbstractObject
         #
         has_many :dependencies, PBXTargetDependency
 
+        has_many :file_system_synchronized_groups, PBXFileSystemSynchronizedRootGroup
+
         public
 
         # @!group Helpers
diff --git a/lib/xcodeproj/project/object/root_object.rb b/lib/xcodeproj/project/object/root_object.rb
index 8737400f..1cd5e71d 100644
--- a/lib/xcodeproj/project/object/root_object.rb
+++ b/lib/xcodeproj/project/object/root_object.rb
@@ -53,6 +53,10 @@ class PBXProject < AbstractObject
         #
         attribute :minimized_project_reference_proxies, String, '0'
 
+        #  @return [String] preferred project object version
+        #
+        attribute :preferred_project_object_version, String, '77'
+
         # @return [PBXGroup] the group containing the references to products of
         #         the project.
         #
diff --git a/spec/project/object/root_object_spec.rb b/spec/project/object/root_object_spec.rb
index 45493fda..f23f6ca4 100644
--- a/spec/project/object/root_object_spec.rb
+++ b/spec/project/object/root_object_spec.rb
@@ -43,6 +43,10 @@ module ProjectSpecs
       @root_object.minimized_project_reference_proxies.should == '0'
     end
 
+    it 'returns the preferred project object version' do
+      @root_object.preferred_project_object_version.should == '77'
+    end
+
     it 'returns the products group' do
       @root_object.product_ref_group.class.should == PBXGroup
     end