diff --git a/lib/ldclient-rb/impl/data_system/polling.rb b/lib/ldclient-rb/impl/data_system/polling.rb
index 8c5d1266..629e8e9d 100644
--- a/lib/ldclient-rb/impl/data_system/polling.rb
+++ b/lib/ldclient-rb/impl/data_system/polling.rb
@@ -497,6 +497,8 @@ def self.polling_payload_to_changeset(data)
             builder.start(server_intent.payload.code)
 
           when LaunchDarkly::Interfaces::DataSystem::EventName::PUT_OBJECT
+            next if LaunchDarkly::Impl::DataSystem::ProtocolV2.unsupported_kind?(event[:data])
+
             begin
               put = LaunchDarkly::Impl::DataSystem::ProtocolV2::PutObject.from_h(event[:data])
             rescue ArgumentError => e
@@ -506,6 +508,8 @@ def self.polling_payload_to_changeset(data)
             builder.add_put(put.kind, put.key, put.version, put.object)
 
           when LaunchDarkly::Interfaces::DataSystem::EventName::DELETE_OBJECT
+            next if LaunchDarkly::Impl::DataSystem::ProtocolV2.unsupported_kind?(event[:data])
+
             begin
               delete_object = LaunchDarkly::Impl::DataSystem::ProtocolV2::DeleteObject.from_h(event[:data])
             rescue ArgumentError => e
diff --git a/lib/ldclient-rb/impl/data_system/protocolv2.rb b/lib/ldclient-rb/impl/data_system/protocolv2.rb
index ef6b5ad3..da1cfd02 100644
--- a/lib/ldclient-rb/impl/data_system/protocolv2.rb
+++ b/lib/ldclient-rb/impl/data_system/protocolv2.rb
@@ -1,4 +1,5 @@
 require 'json'
+require 'ldclient-rb/interfaces/data_system'
 
 module LaunchDarkly
   module Impl
@@ -9,6 +10,26 @@ module ProtocolV2
         # LaunchDarkly data system version 2 (FDv2).
         #
 
+        SUPPORTED_KINDS = [
+          LaunchDarkly::Interfaces::DataSystem::ObjectKind::FLAG,
+          LaunchDarkly::Interfaces::DataSystem::ObjectKind::SEGMENT,
+        ].freeze
+
+        #
+        # Returns true if put-object or delete-object data names a kind this SDK
+        # does not support. Such objects are ignored so that payloads carrying
+        # newer kinds can still be applied.
+        #
+        # @param data [Hash] The hash representation of the event data
+        # @return [Boolean]
+        #
+        def self.unsupported_kind?(data)
+          return false unless data.is_a?(Hash)
+
+          kind = data[:kind]
+          !kind.nil? && !SUPPORTED_KINDS.include?(kind)
+        end
+
         #
         # DeleteObject specifies the deletion of a particular object.
         #
diff --git a/lib/ldclient-rb/impl/data_system/streaming.rb b/lib/ldclient-rb/impl/data_system/streaming.rb
index ae37bcae..532fef21 100644
--- a/lib/ldclient-rb/impl/data_system/streaming.rb
+++ b/lib/ldclient-rb/impl/data_system/streaming.rb
@@ -246,13 +246,19 @@ def stop
             nil
 
           when LaunchDarkly::Interfaces::DataSystem::EventName::PUT_OBJECT
-            put = LaunchDarkly::Impl::DataSystem::ProtocolV2::PutObject.from_h(JSON.parse(message.data, symbolize_names: true))
-            change_set_builder.add_put(put.kind, put.key, put.version, put.object)
+            data = JSON.parse(message.data, symbolize_names: true)
+            unless LaunchDarkly::Impl::DataSystem::ProtocolV2.unsupported_kind?(data)
+              put = LaunchDarkly::Impl::DataSystem::ProtocolV2::PutObject.from_h(data)
+              change_set_builder.add_put(put.kind, put.key, put.version, put.object)
+            end
             nil
 
           when LaunchDarkly::Interfaces::DataSystem::EventName::DELETE_OBJECT
-            delete_object = LaunchDarkly::Impl::DataSystem::ProtocolV2::DeleteObject.from_h(JSON.parse(message.data, symbolize_names: true))
-            change_set_builder.add_delete(delete_object.kind, delete_object.key, delete_object.version)
+            data = JSON.parse(message.data, symbolize_names: true)
+            unless LaunchDarkly::Impl::DataSystem::ProtocolV2.unsupported_kind?(data)
+              delete_object = LaunchDarkly::Impl::DataSystem::ProtocolV2::DeleteObject.from_h(data)
+              change_set_builder.add_delete(delete_object.kind, delete_object.key, delete_object.version)
+            end
             nil
 
           when LaunchDarkly::Interfaces::DataSystem::EventName::GOODBYE
diff --git a/spec/impl/data_system/polling_payload_parsing_spec.rb b/spec/impl/data_system/polling_payload_parsing_spec.rb
index 877ad5ce..e590285a 100644
--- a/spec/impl/data_system/polling_payload_parsing_spec.rb
+++ b/spec/impl/data_system/polling_payload_parsing_spec.rb
@@ -100,6 +100,28 @@ module DataSystem
           expect(result.value.selector.version).to eq(461)
         end
 
+        it "ignores put and delete objects of unknown kinds" do
+          payload_str = '{"events":[ {"event":"server-intent","data":{"payloads":[ {"id":"5A46PZ79FQ9D08YYKT79DECDNV","target":461,"intentCode":"xfer-full","reason":"payload-missing"}]}},{"event": "put-object","data": {"key":"sampleflag","kind":"flag","version":461,"object":{"key":"sampleflag","version":112}}},{"event": "put-object","data": {"key":"sampleskill","kind":"some-future-kind","version":461,"object":{"foo":1}}},{"event": "delete-object","data": {"key":"sampleskill","kind":"some-future-kind","version":461}},{"event": "delete-object","data": {"key":"samplesegment","kind":"segment","version":461}},{"event":"payload-transferred","data":{"state":"(p:5A46PZ79FQ9D08YYKT79DECDNV:461)","id":"5A46PZ79FQ9D08YYKT79DECDNV","version":461}}]}' # rubocop:disable Layout/LineLength
+
+          # Parse a payload that mixes known and unknown object kinds.
+          result = LaunchDarkly::Impl::DataSystem.polling_payload_to_changeset(JSON.parse(payload_str, symbolize_names: true))
+
+          # The payload completes with only the known objects.
+          expect(result.success?).to eq(true)
+          expect(result.value.intent_code).to eq(LaunchDarkly::Interfaces::DataSystem::IntentCode::TRANSFER_FULL)
+          expect(result.value.changes.length).to eq(2)
+
+          expect(result.value.changes[0].action).to eq(LaunchDarkly::Interfaces::DataSystem::ChangeType::PUT)
+          expect(result.value.changes[0].kind).to eq(LaunchDarkly::Interfaces::DataSystem::ObjectKind::FLAG)
+          expect(result.value.changes[0].key).to eq(:sampleflag)
+
+          expect(result.value.changes[1].action).to eq(LaunchDarkly::Interfaces::DataSystem::ChangeType::DELETE)
+          expect(result.value.changes[1].kind).to eq(LaunchDarkly::Interfaces::DataSystem::ObjectKind::SEGMENT)
+          expect(result.value.changes[1].key).to eq(:samplesegment)
+
+          expect(result.value.selector.state).to eq("(p:5A46PZ79FQ9D08YYKT79DECDNV:461)")
+        end
+
         it "handles invalid put object" do
           payload_str = '{"events":[ {"event":"server-intent","data":{"payloads":[ {"id":"5A46PZ79FQ9D08YYKT79DECDNV","target":461,"intentCode":"xfer-full","reason":"payload-missing"}]}},{"event": "put-object","data": {}},{"event":"payload-transferred","data":{"state":"(p:5A46PZ79FQ9D08YYKT79DECDNV:461)","id":"5A46PZ79FQ9D08YYKT79DECDNV","version":461}}]}' # rubocop:disable Layout/LineLength
           result = LaunchDarkly::Impl::DataSystem.polling_payload_to_changeset(JSON.parse(payload_str, symbolize_names: true))
diff --git a/spec/impl/data_system/streaming_synchronizer_spec.rb b/spec/impl/data_system/streaming_synchronizer_spec.rb
index 513c5cf7..860c5029 100644
--- a/spec/impl/data_system/streaming_synchronizer_spec.rb
+++ b/spec/impl/data_system/streaming_synchronizer_spec.rb
@@ -215,6 +215,72 @@ def initialize(type, data = nil)
             expect(update.change_set.changes[0].version).to eq(101)
           end
 
+          it "ignores put and delete objects of unknown kinds" do
+            server_intent = LaunchDarkly::Interfaces::DataSystem::ServerIntent.new(
+              payload: LaunchDarkly::Interfaces::DataSystem::Payload.new(
+                id: "id",
+                target: 300,
+                code: LaunchDarkly::Interfaces::DataSystem::IntentCode::TRANSFER_FULL,
+                reason: "cant-catchup"
+              )
+            )
+            known_put = LaunchDarkly::Impl::DataSystem::ProtocolV2::PutObject.new(
+              version: 100,
+              kind: LaunchDarkly::Interfaces::DataSystem::ObjectKind::FLAG,
+              key: "flagkey",
+              object: { key: "flagkey" }
+            )
+            unknown_put = LaunchDarkly::Impl::DataSystem::ProtocolV2::PutObject.new(
+              version: 100,
+              kind: "some-future-kind",
+              key: "otherkey",
+              object: { foo: 1 }
+            )
+            unknown_delete = LaunchDarkly::Impl::DataSystem::ProtocolV2::DeleteObject.new(
+              version: 101,
+              kind: "some-future-kind",
+              key: "otherkey"
+            )
+            known_delete = LaunchDarkly::Impl::DataSystem::ProtocolV2::DeleteObject.new(
+              version: 101,
+              kind: LaunchDarkly::Interfaces::DataSystem::ObjectKind::SEGMENT,
+              key: "segmentkey"
+            )
+            selector = LaunchDarkly::Interfaces::DataSystem::Selector.new(state: "p:SOMETHING:300", version: 300)
+
+            expect(logger).not_to receive(:warn)
+            expect(logger).not_to receive(:error)
+
+            # Process a payload that mixes known and unknown object kinds
+            synchronizer.send(:process_message, MockSSEEvent.new(LaunchDarkly::Interfaces::DataSystem::EventName::SERVER_INTENT, JSON.generate(server_intent.to_h)),
+change_set_builder, envid)
+            [known_put, unknown_put].each do |put|
+              result = synchronizer.send(:process_message, MockSSEEvent.new(LaunchDarkly::Interfaces::DataSystem::EventName::PUT_OBJECT, JSON.generate(put.to_h)),
+change_set_builder, envid)
+              expect(result).to be_nil
+            end
+            [unknown_delete, known_delete].each do |delete_object|
+              result = synchronizer.send(:process_message, MockSSEEvent.new(LaunchDarkly::Interfaces::DataSystem::EventName::DELETE_OBJECT, JSON.generate(delete_object.to_h)),
+change_set_builder, envid)
+              expect(result).to be_nil
+            end
+            update = synchronizer.send(:process_message, MockSSEEvent.new(LaunchDarkly::Interfaces::DataSystem::EventName::PAYLOAD_TRANSFERRED, JSON.generate(selector.to_h)),
+change_set_builder, envid)
+
+            # The payload completes as valid with only the known objects
+            expect(update).not_to be_nil
+            expect(update.state).to eq(LaunchDarkly::Interfaces::DataSource::Status::VALID)
+            expect(update.error).to be_nil
+            expect(update.change_set).not_to be_nil
+            expect(update.change_set.changes.length).to eq(2)
+            expect(update.change_set.changes[0].action).to eq(LaunchDarkly::Interfaces::DataSystem::ChangeType::PUT)
+            expect(update.change_set.changes[0].kind).to eq(LaunchDarkly::Interfaces::DataSystem::ObjectKind::FLAG)
+            expect(update.change_set.changes[0].key).to eq(:flagkey)
+            expect(update.change_set.changes[1].action).to eq(LaunchDarkly::Interfaces::DataSystem::ChangeType::DELETE)
+            expect(update.change_set.changes[1].kind).to eq(LaunchDarkly::Interfaces::DataSystem::ObjectKind::SEGMENT)
+            expect(update.change_set.changes[1].key).to eq(:segmentkey)
+          end
+
           it "swallows goodbye events" do
             server_intent = LaunchDarkly::Interfaces::DataSystem::ServerIntent.new(
               payload: LaunchDarkly::Interfaces::DataSystem::Payload.new(