diff --git a/lib/microsoft_kiota_serialization_json/json_serialization_writer.rb b/lib/microsoft_kiota_serialization_json/json_serialization_writer.rb
index c4aeacb..5856f8c 100644
--- a/lib/microsoft_kiota_serialization_json/json_serialization_writer.rb
+++ b/lib/microsoft_kiota_serialization_json/json_serialization_writer.rb
@@ -147,29 +147,19 @@ def write_collection_of_primitive_values(key, values)
     def write_collection_of_object_values(key, values)
       if values
         if !key
-          return values.map do |v|
-            self.write_object_value(nil, v)
-          end
-        end
-        @writer[key] = values.map do |v|
-          self.write_object_value(nil, v).writer
+          return values.map { |v| write_object_value(nil, v) }
         end
+        @writer[key] = values.map { |v| object_value_hash(v) }
       end
     end
 
-    def write_object_value(key, value)
+    def write_object_value(key, value, *additional_values_to_merge)
       if value
-        if !key
-          temp = JsonSerializationWriter.new()
-          value.serialize(temp)
-          return temp
-        end
-        begin
-          temp = JsonSerializationWriter.new()
-          value.serialize(temp)
-          @writer[key] = temp.writer
-        rescue StandardError => e
-          raise e.class, "no key or value included in write_boolean_value(key, value)" 
+        if key
+          @writer[key] = object_value_hash(value, *additional_values_to_merge)
+        else
+          value.serialize(self)
+          additional_values_to_merge.each { |v| v.serialize(self) unless v.nil? }
         end
       end
     end
@@ -191,6 +181,17 @@ def write_additional_data(value)
       end
     end
 
+    private
+
+    def object_value_hash(value, *additional_values_to_merge)
+      temp = JsonSerializationWriter.new
+      value.serialize(temp)
+      additional_values_to_merge.each { |v| v.serialize(temp) unless v.nil? }
+      temp.writer
+    end
+
+    public
+
     def write_any_value(key, value)
       if value
         if !!value == value
diff --git a/microsoft_kiota_serialization_json.gemspec b/microsoft_kiota_serialization_json.gemspec
index 5202cbf..27363e0 100644
--- a/microsoft_kiota_serialization_json.gemspec
+++ b/microsoft_kiota_serialization_json.gemspec
@@ -30,7 +30,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_runtime_dependency 'microsoft_kiota_abstractions', '>= 0.14', '< 0.16'
+  spec.add_runtime_dependency 'microsoft_kiota_abstractions', '>= 0.16', '< 0.18'
   spec.add_runtime_dependency 'uuidtools', '>= 2.2', '< 3.1'
   spec.add_runtime_dependency 'json', '>= 2.6.3', '< 2.22.0'
   spec.add_development_dependency 'rake', '~> 13.0'
diff --git a/spec/json_serialization_writer_composed_type_spec.rb b/spec/json_serialization_writer_composed_type_spec.rb
new file mode 100644
index 0000000..9bffd43
--- /dev/null
+++ b/spec/json_serialization_writer_composed_type_spec.rb
@@ -0,0 +1,272 @@
+# frozen_string_literal: true
+
+require_relative 'spec_helper'
+require 'microsoft_kiota_abstractions'
+
+module TestModels
+  class SimpleParsable
+    include MicrosoftKiotaAbstractions::Parsable
+
+    attr_accessor :name, :age
+
+    def get_field_deserializers
+      {
+        'name' => lambda { |n| @name = n.get_string_value },
+        'age' => lambda { |n| @age = n.get_number_value }
+      }
+    end
+
+    def serialize(writer)
+      writer.write_string_value('name', @name)
+      writer.write_number_value('age', @age)
+    end
+
+    def self.create_from_discriminator_value(_parse_node)
+      SimpleParsable.new
+    end
+  end
+
+  class AnotherParsable
+    include MicrosoftKiotaAbstractions::Parsable
+
+    attr_accessor :email
+
+    def get_field_deserializers
+      { 'email' => lambda { |n| @email = n.get_string_value } }
+    end
+
+    def serialize(writer)
+      writer.write_string_value('email', @email)
+    end
+
+    def self.create_from_discriminator_value(_parse_node)
+      AnotherParsable.new
+    end
+  end
+
+  class UnionTypeWrapper
+    include MicrosoftKiotaAbstractions::Parsable
+    include MicrosoftKiotaAbstractions::ComposedTypeWrapper
+
+    attr_accessor :simple, :another
+
+    def get_field_deserializers
+      return @simple.get_field_deserializers if @simple
+      return @another.get_field_deserializers if @another
+      {}
+    end
+
+    def serialize(writer)
+      if @simple
+        writer.write_object_value(nil, @simple)
+      elsif @another
+        writer.write_object_value(nil, @another)
+      end
+    end
+
+    def self.create_from_discriminator_value(_parse_node)
+      UnionTypeWrapper.new
+    end
+  end
+
+  class IntersectionTypeWrapper
+    include MicrosoftKiotaAbstractions::Parsable
+    include MicrosoftKiotaAbstractions::ComposedTypeWrapper
+
+    attr_accessor :simple, :another
+
+    def get_field_deserializers
+      MicrosoftKiotaAbstractions::ParseNodeHelper
+        .merge_deserializers_for_intersection_wrapper(@simple, @another)
+    end
+
+    def serialize(writer)
+      writer.write_object_value(nil, @simple, @another)
+    end
+
+    def self.create_from_discriminator_value(_parse_node)
+      IntersectionTypeWrapper.new
+    end
+  end
+end
+
+RSpec.describe MicrosoftKiotaSerializationJson::JsonSerializationWriter do
+  describe '#write_object_value' do
+    it 'serializes a regular object with a key' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      obj = TestModels::SimpleParsable.new
+      obj.name = 'Alice'
+      obj.age = 30
+
+      writer.write_object_value('person', obj)
+      expect(writer.writer['person']).to eq({ 'name' => 'Alice', 'age' => 30 })
+    end
+
+    it 'serializes a regular object with additional values merged under a key' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      obj1 = TestModels::SimpleParsable.new
+      obj1.name = 'Alice'
+      obj1.age = 30
+      obj2 = TestModels::AnotherParsable.new
+      obj2.email = 'alice@example.com'
+
+      writer.write_object_value('person', obj1, obj2)
+      expect(writer.writer['person']).to eq({ 'name' => 'Alice', 'age' => 30, 'email' => 'alice@example.com' })
+    end
+
+    it 'skips nil additional values' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      obj = TestModels::SimpleParsable.new
+      obj.name = 'Bob'
+      obj.age = 22
+
+      writer.write_object_value('person', obj, nil, nil)
+      expect(writer.writer['person']).to eq({ 'name' => 'Bob', 'age' => 22 })
+    end
+
+    it 'returns nil when value is nil' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      result = writer.write_object_value('key', nil)
+      expect(result).to be_nil
+      expect(writer.writer).to eq({})
+    end
+
+    it 'serializes into self when key is nil for a non-composed type' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      obj = TestModels::SimpleParsable.new
+      obj.name = 'Eve'
+      obj.age = 40
+
+      writer.write_object_value(nil, obj)
+      expect(writer.writer).to eq({ 'name' => 'Eve', 'age' => 40 })
+    end
+  end
+
+  describe '#write_object_value with union types' do
+    it 'serializes the first branch of a union into the current writer' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      union = TestModels::UnionTypeWrapper.new
+      inner = TestModels::SimpleParsable.new
+      inner.name = 'Charlie'
+      inner.age = 25
+      union.simple = inner
+
+      writer.write_object_value(nil, union)
+      expect(writer.writer).to eq({ 'name' => 'Charlie', 'age' => 25 })
+    end
+
+    it 'serializes the second branch of a union into the current writer' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      union = TestModels::UnionTypeWrapper.new
+      inner = TestModels::AnotherParsable.new
+      inner.email = 'test@example.com'
+      union.another = inner
+
+      writer.write_object_value(nil, union)
+      expect(writer.writer).to eq({ 'email' => 'test@example.com' })
+    end
+
+    it 'produces valid JSON for a union type' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      union = TestModels::UnionTypeWrapper.new
+      inner = TestModels::SimpleParsable.new
+      inner.name = 'Charlie'
+      inner.age = 25
+      union.simple = inner
+
+      writer.write_object_value(nil, union)
+      json = writer.get_serialized_content
+      parsed = JSON.parse(json)
+      expect(parsed).to eq({ 'name' => 'Charlie', 'age' => 25 })
+    end
+  end
+
+  describe '#write_object_value with intersection types' do
+    it 'merges all intersection members into the current writer' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      intersection = TestModels::IntersectionTypeWrapper.new
+      obj1 = TestModels::SimpleParsable.new
+      obj1.name = 'Dana'
+      obj1.age = 28
+      obj2 = TestModels::AnotherParsable.new
+      obj2.email = 'dana@example.com'
+      intersection.simple = obj1
+      intersection.another = obj2
+
+      writer.write_object_value(nil, intersection)
+      expect(writer.writer).to eq({ 'name' => 'Dana', 'age' => 28, 'email' => 'dana@example.com' })
+    end
+
+    it 'produces valid JSON for an intersection type' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      intersection = TestModels::IntersectionTypeWrapper.new
+      obj1 = TestModels::SimpleParsable.new
+      obj1.name = 'Dana'
+      obj1.age = 28
+      obj2 = TestModels::AnotherParsable.new
+      obj2.email = 'dana@example.com'
+      intersection.simple = obj1
+      intersection.another = obj2
+
+      writer.write_object_value(nil, intersection)
+      json = writer.get_serialized_content
+      parsed = JSON.parse(json)
+      expect(parsed).to eq({ 'name' => 'Dana', 'age' => 28, 'email' => 'dana@example.com' })
+    end
+  end
+
+  describe '#write_collection_of_object_values' do
+    it 'serializes a collection of objects under a key' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      obj1 = TestModels::SimpleParsable.new
+      obj1.name = 'Alice'
+      obj1.age = 30
+      obj2 = TestModels::SimpleParsable.new
+      obj2.name = 'Bob'
+      obj2.age = 25
+
+      writer.write_collection_of_object_values('people', [obj1, obj2])
+      expect(writer.writer['people']).to eq([
+        { 'name' => 'Alice', 'age' => 30 },
+        { 'name' => 'Bob', 'age' => 25 }
+      ])
+    end
+
+    it 'serializes into self when key is nil' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      obj1 = TestModels::SimpleParsable.new
+      obj1.name = 'Alice'
+      obj1.age = 30
+
+      writer.write_collection_of_object_values(nil, [obj1])
+      expect(writer.writer).to eq({ 'name' => 'Alice', 'age' => 30 })
+    end
+
+    it 'does not contaminate the parent writer' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      writer.write_string_value('top_level', 'value')
+      obj = TestModels::SimpleParsable.new
+      obj.name = 'Alice'
+      obj.age = 30
+
+      writer.write_collection_of_object_values('people', [obj])
+      expect(writer.writer.keys).to contain_exactly('top_level', 'people')
+    end
+
+    it 'produces valid JSON with a collection' do
+      writer = MicrosoftKiotaSerializationJson::JsonSerializationWriter.new
+      obj1 = TestModels::SimpleParsable.new
+      obj1.name = 'Alice'
+      obj1.age = 30
+      obj2 = TestModels::AnotherParsable.new
+      obj2.email = 'bob@example.com'
+
+      writer.write_collection_of_object_values('items', [obj1])
+      writer.write_object_value('contact', obj2)
+      json = writer.get_serialized_content
+      parsed = JSON.parse(json)
+      expect(parsed['items']).to eq([{ 'name' => 'Alice', 'age' => 30 }])
+      expect(parsed['contact']).to eq({ 'email' => 'bob@example.com' })
+    end
+  end
+end