diff --git a/CHANGES.txt b/CHANGES.txt
index 33219edd..be40f790 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,5 +1,8 @@
 CHANGES
 
+8.7.0 (Aug 1, 2025)
+- Added support for feature flag prerequisites. This allows customers to define dependency conditions between flags, which are evaluated before any allowlists or targeting rules.
+
 8.6.0 (Jun 17, 2025)
 - Added support for rule-based segments. These segments determine membership at runtime by evaluating their configured rules against the user attributes provided to the SDK.
 - Added support for feature flag prerequisites. This allows customers to define dependency conditions between flags, which are evaluated before any allowlists or targeting rules.
diff --git a/lib/splitclient-rb.rb b/lib/splitclient-rb.rb
index b4ffcdeb..30e0a2b3 100644
--- a/lib/splitclient-rb.rb
+++ b/lib/splitclient-rb.rb
@@ -109,6 +109,7 @@
 require 'splitclient-rb/engine/models/segment_type'
 require 'splitclient-rb/engine/models/treatment'
 require 'splitclient-rb/engine/models/split_http_response'
+require 'splitclient-rb/engine/models/evaluation_options'
 require 'splitclient-rb/engine/auth_api_client'
 require 'splitclient-rb/engine/back_off'
 require 'splitclient-rb/engine/push_manager'
diff --git a/lib/splitclient-rb/cache/senders/impressions_formatter.rb b/lib/splitclient-rb/cache/senders/impressions_formatter.rb
index b2f1de95..a84522f5 100644
--- a/lib/splitclient-rb/cache/senders/impressions_formatter.rb
+++ b/lib/splitclient-rb/cache/senders/impressions_formatter.rb
@@ -37,15 +37,28 @@ def feature_impressions(filtered_impressions, feature)
 
         def current_impressions(feature_impressions)
           feature_impressions.map do |impression|
-            {
-              k: impression[:i][:k],
-              t: impression[:i][:t],
-              m: impression[:i][:m],
-              b: impression[:i][:b],
-              r: impression[:i][:r],
-              c: impression[:i][:c],
-              pt: impression[:i][:pt]
-            }
+            if impression[:i][:properties].nil?
+              impression = {
+                k: impression[:i][:k],
+                t: impression[:i][:t],
+                m: impression[:i][:m],
+                b: impression[:i][:b],
+                r: impression[:i][:r],
+                c: impression[:i][:c],
+                pt: impression[:i][:pt]
+              }
+            else
+              impression = {
+                k: impression[:i][:k],
+                t: impression[:i][:t],
+                m: impression[:i][:m],
+                b: impression[:i][:b],
+                r: impression[:i][:r],
+                c: impression[:i][:c],
+                pt: impression[:i][:pt],
+                properties: impression[:i][:properties].to_json.to_s
+              }
+            end
           end
         end
 
@@ -73,7 +86,8 @@ def impression_hash(impression)
           "#{impression[:i][:b]}:" \
           "#{impression[:i][:c]}:" \
           "#{impression[:i][:t]}:" \
-          "#{impression[:i][:pt]}"
+          "#{impression[:i][:pt]}" \
+          "#{impression[:i][:properties]}" \
         end
       end
     end
diff --git a/lib/splitclient-rb/clients/split_client.rb b/lib/splitclient-rb/clients/split_client.rb
index ed0e1021..31a40742 100644
--- a/lib/splitclient-rb/clients/split_client.rb
+++ b/lib/splitclient-rb/clients/split_client.rb
@@ -35,23 +35,26 @@ def initialize(sdk_key, repositories, status_manager, config, impressions_manage
     end
 
     def get_treatment(
-        key, split_name, attributes = {}, split_data = nil, store_impressions = true,
+        key, split_name, attributes = {}, evaluation_options = nil, split_data = nil, store_impressions = nil,
         multiple = false, evaluator = nil
       )
-      result = treatment(key, split_name, attributes, split_data, store_impressions, GET_TREATMENT, multiple)
+      log_deprecated_warning(GET_TREATMENT, evaluator, 'evaluator')
+    
+      result = treatment(key, split_name, attributes, split_data, store_impressions, GET_TREATMENT, multiple, evaluation_options)
       return result.tap { |t| t.delete(:config) } if multiple
       result[:treatment]
     end
 
     def get_treatment_with_config(
-        key, split_name, attributes = {}, split_data = nil, store_impressions = true,
+        key, split_name, attributes = {}, evaluation_options = nil, split_data = nil, store_impressions = nil,
         multiple = false, evaluator = nil
       )
-      treatment(key, split_name, attributes, split_data, store_impressions, GET_TREATMENT_WITH_CONFIG, multiple)
+      log_deprecated_warning(GET_TREATMENT, evaluator, 'evaluator')
+      treatment(key, split_name, attributes, split_data, store_impressions, GET_TREATMENT_WITH_CONFIG, multiple, evaluation_options)
     end
 
-    def get_treatments(key, split_names, attributes = {})
-      treatments = treatments(key, split_names, attributes)
+    def get_treatments(key, split_names, attributes = {}, evaluation_options = nil)
+      treatments = treatments(key, split_names, attributes, evaluation_options)
 
       return treatments if treatments.nil?
       keys = treatments.keys
@@ -59,40 +62,40 @@ def get_treatments(key, split_names, attributes = {})
       Hash[keys.zip(treats)]
     end
 
-    def get_treatments_with_config(key, split_names, attributes = {})
-      treatments(key, split_names, attributes, GET_TREATMENTS_WITH_CONFIG)
+    def get_treatments_with_config(key, split_names, attributes = {}, evaluation_options = nil)
+      treatments(key, split_names, attributes, evaluation_options, GET_TREATMENTS_WITH_CONFIG)
     end
 
-    def get_treatments_by_flag_set(key, flag_set, attributes = {})
+    def get_treatments_by_flag_set(key, flag_set, attributes = {}, evaluation_options = nil)
       valid_flag_set = @split_validator.valid_flag_sets(GET_TREATMENTS_BY_FLAG_SET, [flag_set])
       split_names = @splits_repository.get_feature_flags_by_sets(valid_flag_set)
-      treatments = treatments(key, split_names, attributes, GET_TREATMENTS_BY_FLAG_SET)
+      treatments = treatments(key, split_names, attributes, evaluation_options, GET_TREATMENTS_BY_FLAG_SET)
       return treatments if treatments.nil?
       keys = treatments.keys
       treats = treatments.map { |_,t| t[:treatment]  }
       Hash[keys.zip(treats)]
     end
 
-    def get_treatments_by_flag_sets(key, flag_sets, attributes = {})
+    def get_treatments_by_flag_sets(key, flag_sets, attributes = {}, evaluation_options = nil)
       valid_flag_set = @split_validator.valid_flag_sets(GET_TREATMENTS_BY_FLAG_SETS, flag_sets)
       split_names = @splits_repository.get_feature_flags_by_sets(valid_flag_set)
-      treatments = treatments(key, split_names, attributes, GET_TREATMENTS_BY_FLAG_SETS)
+      treatments = treatments(key, split_names, attributes, evaluation_options, GET_TREATMENTS_BY_FLAG_SETS)
       return treatments if treatments.nil?
       keys = treatments.keys
       treats = treatments.map { |_,t| t[:treatment]  }
       Hash[keys.zip(treats)]
     end
 
-    def get_treatments_with_config_by_flag_set(key, flag_set, attributes = {})
+    def get_treatments_with_config_by_flag_set(key, flag_set, attributes = {}, evaluation_options = nil)
       valid_flag_set = @split_validator.valid_flag_sets(GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SET, [flag_set])
       split_names = @splits_repository.get_feature_flags_by_sets(valid_flag_set)
-      treatments(key, split_names, attributes, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SET)
+      treatments(key, split_names, attributes, evaluation_options, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SET)
     end
 
-    def get_treatments_with_config_by_flag_sets(key, flag_sets, attributes = {})
+    def get_treatments_with_config_by_flag_sets(key, flag_sets, attributes = {}, evaluation_options = nil)
       valid_flag_set = @split_validator.valid_flag_sets(GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SETS, flag_sets)
       split_names = @splits_repository.get_feature_flags_by_sets(valid_flag_set)
-      treatments(key, split_names, attributes, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SETS)
+      treatments(key, split_names, attributes, evaluation_options, GET_TREATMENTS_WITH_CONFIG_BY_FLAG_SETS)
     end
 
     def destroy
@@ -135,10 +138,7 @@ def track(key, traffic_type_name, event_type, value = nil, properties = nil)
       if !properties.nil?
         properties, size = validate_properties(properties)
         properties_size += size
-        if (properties_size > EVENTS_SIZE_THRESHOLD)
-          @config.logger.error("The maximum size allowed for the properties is #{EVENTS_SIZE_THRESHOLD}. Current is #{properties_size}. Event not queued")
-          return false
-        end
+        return false unless check_properties_size(properties_size)
       end
 
       if ready? && !@config.localhost_mode && !@splits_repository.traffic_type_exists(traffic_type_name)
@@ -163,6 +163,14 @@ def block_until_ready(time = nil)
 
     private
 
+    def check_properties_size(properties_size, msg = "Event not queued")
+      if (properties_size > EVENTS_SIZE_THRESHOLD)
+        @config.logger.error("The maximum size allowed for the properties is #{EVENTS_SIZE_THRESHOLD}. Current is #{properties_size}. #{msg}")
+        return false
+      end
+      return true
+    end
+
     def keys_from_key(key)
       case key
       when Hash
@@ -206,7 +214,7 @@ def sanitize_split_names(calling_method, split_names)
       end
     end
 
-    def validate_properties(properties)
+    def validate_properties(properties, method = 'Event')
       properties_count = 0
       size = 0
 
@@ -225,11 +233,21 @@ def validate_properties(properties)
         end
       }
 
-      @config.logger.warn('Event has more than 300 properties. Some of them will be trimmed when processed') if properties_count > 300
+      @config.logger.warn("#{method} has more than 300 properties. Some of them will be trimmed when processed") if properties_count > 300
 
       return fixed_properties, size
     end
 
+    def validate_evaluation_options(evaluation_options)
+      if !evaluation_options.is_a?(SplitIoClient::Engine::Models::EvaluationOptions)
+        @config.logger.warn("Option #{evaluation_options} should be a EvaluationOptions type. Setting value to nil")
+        return nil, 0
+      end
+      evaluation_options.properties = evaluation_options.properties.transform_keys(&:to_sym)
+      evaluation_options.properties, size = validate_properties(evaluation_options.properties, 'Treatment')
+      return evaluation_options, size
+    end
+
     def valid_client
       if @destroyed
         @config.logger.error('Client has already been destroyed - no calls possible')
@@ -238,8 +256,7 @@ def valid_client
       @config.valid_mode
     end
 
-    def treatments(key, feature_flag_names, attributes = {}, calling_method = 'get_treatments')
-      attributes = {} if attributes.nil?
+    def treatments(key, feature_flag_names, attributes = {}, evaluation_options = nil, calling_method = 'get_treatments')
       sanitized_feature_flag_names = sanitize_split_names(calling_method, feature_flag_names)
 
       if sanitized_feature_flag_names.nil?
@@ -255,6 +272,7 @@ def treatments(key, feature_flag_names, attributes = {}, calling_method = 'get_t
       bucketing_key, matching_key = keys_from_key(key)
       bucketing_key = bucketing_key ? bucketing_key.to_s : nil
       matching_key = matching_key ? matching_key.to_s : nil
+      attributes = parsed_attributes(attributes)
 
       if !@config.split_validator.valid_get_treatments_parameters(calling_method, key, sanitized_feature_flag_names, matching_key, bucketing_key, attributes)
         to_return = Hash.new
@@ -269,7 +287,9 @@ def treatments(key, feature_flag_names, attributes = {}, calling_method = 'get_t
         to_return = Hash.new
         sanitized_feature_flag_names.each {|name|
           to_return[name.to_sym] = control_treatment_with_config
-          impressions << { :impression => @impressions_manager.build_impression(matching_key, bucketing_key, name.to_sym, control_treatment_with_config.merge({ :label => Engine::Models::Label::NOT_READY }), false, { attributes: attributes, time: nil }), :disabled => false }
+          impressions << { :impression => @impressions_manager.build_impression(matching_key, bucketing_key, name.to_sym, 
+                                                               control_treatment_with_config.merge({ :label => Engine::Models::Label::NOT_READY }), false, { attributes: attributes, time: nil },
+                                                               evaluation_options), :disabled => false }
         }
         @impressions_manager.track(impressions)
         return to_return
@@ -291,7 +311,7 @@ def treatments(key, feature_flag_names, attributes = {}, calling_method = 'get_t
             invalid_treatments[key] = control_treatment_with_config
           next
         end
-        treatments_labels_change_numbers, impressions = evaluate_treatment(feature_flag, key, bucketing_key, matching_key, attributes, calling_method)
+        treatments_labels_change_numbers, impressions = evaluate_treatment(feature_flag, key, bucketing_key, matching_key, attributes, calling_method, false, evaluation_options)
         treatments[key] =
         {
           treatment: treatments_labels_change_numbers[:treatment],
@@ -313,8 +333,12 @@ def treatments(key, feature_flag_names, attributes = {}, calling_method = 'get_t
     # @param split_data [Hash] split data, when provided this method doesn't fetch splits_repository for the data
     # @param store_impressions [Boolean] impressions aren't stored if this flag is false
     # @return [String/Hash] Treatment as String or Hash of treatments in case of array of features
-    def treatment(key, feature_flag_name, attributes = {}, split_data = nil, store_impressions = true,
-                   calling_method = 'get_treatment', multiple = false)
+    def treatment(key, feature_flag_name, attributes = {}, split_data = nil, store_impressions = nil,
+                   calling_method = 'get_treatment', multiple = false, evaluation_options = nil)
+
+      log_deprecated_warning(calling_method, split_data, 'split_data')
+      log_deprecated_warning(calling_method, store_impressions, 'store_impressions')
+        
       impressions = []
       bucketing_key, matching_key = keys_from_key(key)
 
@@ -332,13 +356,17 @@ def treatment(key, feature_flag_name, attributes = {}, split_data = nil, store_i
       end
 
       feature_flag = @splits_repository.get_split(feature_flag_name)
-      treatments, impressions_decorator = evaluate_treatment(feature_flag, feature_flag_name, bucketing_key, matching_key, attributes, calling_method, multiple)
+      treatments, impressions_decorator = evaluate_treatment(feature_flag, feature_flag_name, bucketing_key, matching_key, attributes, calling_method, multiple, evaluation_options)
 
       @impressions_manager.track(impressions_decorator) unless impressions_decorator.nil?
       treatments
     end
 
-    def evaluate_treatment(feature_flag, feature_flag_name, bucketing_key, matching_key, attributes, calling_method, multiple = false)
+    def log_deprecated_warning(calling_method, parameter, parameter_name)
+        @config.logger.warn("#{calling_method}: detected #{parameter_name} parameter used, this parameter is deprecated and its value is ignored.") unless parameter.nil?
+    end
+
+    def evaluate_treatment(feature_flag, feature_flag_name, bucketing_key, matching_key, attributes, calling_method, multiple = false, evaluation_options = nil)
       impressions_decorator = []
       begin
         start = Time.now
@@ -359,18 +387,20 @@ def evaluate_treatment(feature_flag, feature_flag_name, bucketing_key, matching_
           impressions_disabled = false
         end
 
+        evaluation_options, size = validate_evaluation_options(evaluation_options) unless evaluation_options.nil?
+        evaluation_options.properties = nil unless evaluation_options.nil? or check_properties_size((EVENT_AVERAGE_SIZE + size), "Properties are ignored")
+
         record_latency(calling_method, start)
-        impression_decorator = { :impression => @impressions_manager.build_impression(matching_key, bucketing_key, feature_flag_name, treatment_data, impressions_disabled, { attributes: attributes, time: nil }), :disabled => impressions_disabled }
+        impression_decorator = { :impression => @impressions_manager.build_impression(matching_key, bucketing_key, feature_flag_name, treatment_data, impressions_disabled, { attributes: attributes, time: nil }, evaluation_options), :disabled => impressions_disabled }
         impressions_decorator << impression_decorator unless impression_decorator.nil?
       rescue StandardError => e
         @config.log_found_exception(__method__.to_s, e)
         record_exception(calling_method)
-        impression_decorator = { :impression => @impressions_manager.build_impression(matching_key, bucketing_key, feature_flag_name, control_treatment, false, { attributes: attributes, time: nil }), :disabled => false }
+        impression_decorator = { :impression => @impressions_manager.build_impression(matching_key, bucketing_key, feature_flag_name, control_treatment, false, { attributes: attributes, time: nil }, evaluation_options), :disabled => false }
         impressions_decorator << impression_decorator unless impression_decorator.nil?
 
         return parsed_treatment(control_treatment.merge({ :label => Engine::Models::Label::EXCEPTION }), multiple), impressions_decorator
       end
-
       return parsed_treatment(treatment_data, multiple), impressions_decorator
     end
 
diff --git a/lib/splitclient-rb/engine/common/impressions_manager.rb b/lib/splitclient-rb/engine/common/impressions_manager.rb
index adb71c6f..d685dd7b 100644
--- a/lib/splitclient-rb/engine/common/impressions_manager.rb
+++ b/lib/splitclient-rb/engine/common/impressions_manager.rb
@@ -18,17 +18,24 @@ def initialize(config,
           @unique_keys_tracker = unique_keys_tracker
         end
 
-        def build_impression(matching_key, bucketing_key, split_name, treatment_data, impressions_disabled, params = {})
-          impression_data = impression_data(matching_key, bucketing_key, split_name, treatment_data, params[:time])
+        def build_impression(matching_key, bucketing_key, split_name, treatment_data, impressions_disabled, params = {},
+                             evaluation_options = nil)
+          properties = get_properties(evaluation_options)
+          impression_data = impression_data(matching_key, bucketing_key, split_name, treatment_data, params[:time], properties)
+          return impression(impression_data, params[:attributes]) if check_return_conditions(properties)
+
           begin
-            if @config.impressions_mode == :none || impressions_disabled
+            if check_none_mode(impressions_disabled)
               @impression_counter.inc(split_name, impression_data[:m])
               @unique_keys_tracker.track(split_name, matching_key)
-            elsif @config.impressions_mode == :debug #  In DEBUG mode we should calculate the pt only.
-              impression_data[:pt] = @impression_observer.test_and_set(impression_data)
-            else # In OPTIMIZED mode we should track the total amount of evaluations and deduplicate the impressions.
+            end
+            if check_observe_impressions
+              # In DEBUG mode we should calculate the pt only.
               impression_data[:pt] = @impression_observer.test_and_set(impression_data)
-              @impression_counter.inc(split_name, impression_data[:m]) unless impression_data[:pt].nil?
+            end
+            if check_impression_counter(impression_data)
+              # In OPTIMIZED mode we should track the total amount of evaluations and deduplicate the impressions.
+              @impression_counter.inc(split_name, impression_data[:m])
             end
           rescue StandardError => e
             @config.log_found_exception(__method__.to_s, e)
@@ -61,6 +68,26 @@ def track(impressions_decorator)
 
         private
 
+        def check_return_conditions(properties)
+          return (@config.impressions_mode == :debug || @config.impressions_mode == :optimized) && !properties.nil?
+        end
+
+        def check_none_mode(impressions_disabled)
+          return @config.impressions_mode == :none || impressions_disabled
+        end
+
+        def check_observe_impressions
+          return @config.impressions_mode == :debug || @config.impressions_mode == :optimized
+        end
+
+        def check_impression_counter(impression_data)
+          return @config.impressions_mode == :optimized && !impression_data[:pt].nil?
+        end
+
+        def get_properties(evaluation_options)
+          return evaluation_options.nil? ? nil : evaluation_options.properties
+        end
+
         def impression_router
           @impression_router ||= SplitIoClient::ImpressionRouter.new(@config)
         rescue StandardError => e
@@ -79,7 +106,8 @@ def record_stats(stats)
         end
 
         # added param time for test
-        def impression_data(matching_key, bucketing_key, split_name, treatment, time = nil)
+        def impression_data(matching_key, bucketing_key, split_name, treatment, time = nil,
+                            properties = nil)
           {
             k: matching_key,
             b: bucketing_key,
@@ -88,7 +116,8 @@ def impression_data(matching_key, bucketing_key, split_name, treatment, time = n
             r: applied_rule(treatment[:label]),
             c: treatment[:change_number],
             m: time || (Time.now.to_f * 1000.0).to_i,
-            pt: nil
+            pt: nil,
+            properties: properties
           }
         end
 
diff --git a/lib/splitclient-rb/engine/models/evaluation_options.rb b/lib/splitclient-rb/engine/models/evaluation_options.rb
new file mode 100644
index 00000000..c79c710a
--- /dev/null
+++ b/lib/splitclient-rb/engine/models/evaluation_options.rb
@@ -0,0 +1,9 @@
+module SplitIoClient::Engine::Models
+    class EvaluationOptions
+    attr_accessor :properties
+
+    def initialize(properties)
+        @properties = properties
+    end
+  end
+end
diff --git a/lib/splitclient-rb/version.rb b/lib/splitclient-rb/version.rb
index d0431b85..c34677cc 100644
--- a/lib/splitclient-rb/version.rb
+++ b/lib/splitclient-rb/version.rb
@@ -1,3 +1,3 @@
 module SplitIoClient
-  VERSION = '8.6.0'
+  VERSION = '8.7.0'
 end
diff --git a/spec/cache/repositories/impressions_repository_spec.rb b/spec/cache/repositories/impressions_repository_spec.rb
index c422d34c..4b815e34 100644
--- a/spec/cache/repositories/impressions_repository_spec.rb
+++ b/spec/cache/repositories/impressions_repository_spec.rb
@@ -25,7 +25,8 @@
             r: 'sample_rule',
             c: 1_533_177_602_748,
             m: 1_478_113_516_002,
-            pt: nil
+            pt: nil,
+            properties: nil
           },
           attributes: {}
         },
@@ -39,7 +40,8 @@
             r: 'sample_rule',
             c: 1_533_177_602_749,
             m: 1_478_113_516_002,
-            pt: nil
+            pt: nil,
+            properties: nil
           },
           attributes: {}
         }
@@ -55,8 +57,8 @@
     it 'adds impressions' do
       params = { attributes: {}, time: 1_478_113_516_002 }
       impressions = []
-      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo, treatment1, false, params), :disabled => false }
-      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :bar, treatment2, false, params), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo, treatment1, false, params, nil), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :bar, treatment2, false, params, nil), :disabled => false }
       impressions_manager.track(impressions)
 
       expect(repository.batch).to match_array(result)
@@ -67,8 +69,8 @@
     it 'adds impressions in bulk' do
       params = { attributes: {}, time: 1_478_113_516_002 }
       impressions = []
-      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo, treatment1, false, params), :disabled => false }
-      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :bar, treatment2, false, params), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo, treatment1, false, params, nil), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :bar, treatment2, false, params, nil), :disabled => false }
       impressions_manager.track(impressions)
 
       expect(repository.batch).to match_array(result)
@@ -80,7 +82,7 @@
       config.labels_enabled = false
       params = { attributes: {}, time: 1_478_113_516_002 }
       impressions = []
-      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo, treatment1, false, params), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo, treatment1, false, params, nil), :disabled => false }
       impressions_manager.track(impressions)
 
       expect(repository.batch.first[:i][:r]).to be_nil
@@ -89,8 +91,8 @@
     it 'bulk size less than the actual queue' do
       params = { attributes: {}, time: 1_478_113_516_002 }
       impressions = []
-      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo, treatment1, false, params), :disabled => false }
-      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo, treatment2, false, params), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo, treatment1, false, params, nil), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo, treatment2, false, params, nil), :disabled => false }
       impressions_manager.track(impressions)
 
       config.impressions_bulk_size = 1
@@ -142,8 +144,8 @@
         treatment = { treatment: 'on', label: 'sample_rule', change_number: 1_533_177_602_748 }
         params = { attributes: {}, time: 1_478_113_516_002 }
         impressions = []
-        impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo1, treatment, false, params), :disabled => false }
-        impressions << { :impression => impressions_manager.build_impression('matching_key2', nil, :foo1, treatment, false, params), :disabled => false }
+        impressions << { :impression => impressions_manager.build_impression('matching_key1', nil, :foo1, treatment, false, params, nil), :disabled => false }
+        impressions << { :impression => impressions_manager.build_impression('matching_key2', nil, :foo1, treatment, false, params, nil), :disabled => false }
         impressions_manager.track(impressions)
 
         expect(repository.batch.size).to eq(1)
@@ -200,8 +202,8 @@
       expect(config.impressions_adapter).to receive(:expire).once.with(anything, 3600)
       params = { attributes: {}, time: 1_478_113_516_002 }
       impressions = []
-      impressions << { :impression => impressions_manager.build_impression('matching_key', nil, :foo1, treatment, false, params), :disabled => false }
-      impressions << { :impression => impressions_manager.build_impression('matching_key', nil, :foo1, treatment, false, params), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key', nil, :foo1, treatment, false, params, nil), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key', nil, :foo1, treatment, false, params, nil), :disabled => false }
       impressions_manager.track(impressions)
     end
 
@@ -211,7 +213,7 @@
 
       params = { attributes: {}, time: 1_478_113_516_002 }
       impressions = []
-      impressions << { :impression => impressions_manager.build_impression('matching_key', nil, :foo1, treatment, false, params), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key', nil, :foo1, treatment, false, params, nil), :disabled => false }
       impressions_manager.track(impressions)
 
       expect(repository.batch).to eq([])
@@ -221,8 +223,8 @@
       other_treatment = { treatment: 'on', label: 'sample_rule_2', change_number: 1_533_177_602_748 }
       params = { attributes: {}, time: 1_478_113_516_002 }
       impressions = []
-      impressions << { :impression => impressions_manager.build_impression('matching_key', nil, :foo1, treatment, false, params), :disabled => false }
-      impressions << { :impression => impressions_manager.build_impression('matching_key', nil, :foo2, other_treatment, false, params), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key', nil, :foo1, treatment, false, params, nil), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key', nil, :foo2, other_treatment, false, params, nil), :disabled => false }
       impressions_manager.track(impressions)
 
       adapter.get_from_queue('SPLITIO.impressions', 0).map do |e|
@@ -252,8 +254,8 @@
 
       params = { attributes: {}, time: 1_478_113_516_002 }
       impressions = []
-      impressions << { :impression => custom_impressions_manager.build_impression('matching_key', nil, :foo1, treatment, false, params), :disabled => false }
-      impressions << { :impression => custom_impressions_manager.build_impression('matching_key', nil, :foo2, other_treatment, false, params), :disabled => false }
+      impressions << { :impression => custom_impressions_manager.build_impression('matching_key', nil, :foo1, treatment, false, params, nil), :disabled => false }
+      impressions << { :impression => custom_impressions_manager.build_impression('matching_key', nil, :foo2, other_treatment, false, params, nil), :disabled => false }
       custom_impressions_manager.track(impressions)
 
       custom_adapter.get_from_queue('SPLITIO.impressions', 0).map do |e|
diff --git a/spec/cache/senders/impressions_formatter_spec.rb b/spec/cache/senders/impressions_formatter_spec.rb
index e55228ff..6c649a48 100644
--- a/spec/cache/senders/impressions_formatter_spec.rb
+++ b/spec/cache/senders/impressions_formatter_spec.rb
@@ -58,7 +58,7 @@
                                 b: 'foo1',
                                 r: 'custom_label1',
                                 c: 123_456,
-                                pt: nil }]
+                                pt: nil}]
                         },
                          {
                            f: :foo2,
@@ -68,14 +68,14 @@
                                  b: 'foo2',
                                  r: 'custom_label2',
                                  c: 123_499,
-                                 pt: nil }]
+                                pt: nil}]
                          }])
     end
 
     it 'formats multiple impressions for one key' do
       params = { attributes: {}, time: 1_478_113_518_900 }
       impressions = []
-      impressions << { :impression => impressions_manager.build_impression('matching_key3', nil, 'foo2', treatment3, false, params), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key3', nil, 'foo2', treatment3, false, params, SplitIoClient::Engine::Models::EvaluationOptions.new({:prop => "val"})), :disabled => false }
       impressions_manager.track(impressions)
 
       expect(formatted_impressions.find { |i| i[:f] == :foo1 }[:i]).to match_array(
@@ -110,7 +110,8 @@
             b: nil,
             r: nil,
             c: nil,
-            pt: nil
+            pt: nil,
+            properties: '{"prop":"val"}'
           }
         ]
       )
diff --git a/spec/cache/senders/impressions_sender_spec.rb b/spec/cache/senders/impressions_sender_spec.rb
index 96da8aa9..ccb5b885 100644
--- a/spec/cache/senders/impressions_sender_spec.rb
+++ b/spec/cache/senders/impressions_sender_spec.rb
@@ -46,7 +46,7 @@
       params2 = { attributes: {}, time: 1_478_113_518_285 }
       impressions = []
       impressions << { :impression => impressions_manager.build_impression('matching_key', 'foo1', 'foo1', treatment1, false, params), :disabled => false }
-      impressions << { :impression => impressions_manager.build_impression('matching_key2', 'foo2', 'foo2', treatment2, false, params2), :disabled => false }
+      impressions << { :impression => impressions_manager.build_impression('matching_key2', 'foo2', 'foo2', treatment2, false, params2, SplitIoClient::Engine::Models::EvaluationOptions.new({:prop => "val"})), :disabled => false }
       impressions_manager.track(impressions)
     end
 
@@ -89,7 +89,8 @@
                 b: 'foo2',
                 r: 'custom_label2',
                 c: 123_499,
-                pt: nil
+                pt: nil,
+                properties: '{"prop":"val"}'
               }
             ]
           }
diff --git a/spec/engine/common/impression_manager_spec.rb b/spec/engine/common/impression_manager_spec.rb
index 21875236..02aab198 100644
--- a/spec/engine/common/impression_manager_spec.rb
+++ b/spec/engine/common/impression_manager_spec.rb
@@ -59,7 +59,8 @@
             r: 'default label',
             c: 1_478_113_516_002,
             m: 1_478_113_516_222,
-            pt: nil
+            pt: nil,
+            properties: {"prop":"val"}
           },
           attributes: {}
         }
@@ -71,7 +72,7 @@
                                                        'split_name_test',
                                                        treatment,
                                                        false,
-                                                       params)
+                                                       params, SplitIoClient::Engine::Models::EvaluationOptions.new({"prop":"val"}))
       expect(impression).to match(expected)
 
       result_count = impression_counter.pop_all
@@ -97,7 +98,8 @@
           r: 'default label',
           c: 1_478_113_516_002,
           m: 1_478_113_516_222,
-          pt: nil
+          pt: nil,
+          properties: nil
         },
         attributes: {}
       }
@@ -155,7 +157,8 @@
           r: 'default label',
           c: 1_478_113_516_002,
           m: 1_478_113_516_222,
-          pt: nil
+          pt: nil,
+          properties: nil
         },
         attributes: {}
       }
@@ -297,7 +300,8 @@
           r: 'default label',
           c: 1_478_113_516_002,
           m: 1_478_113_516_222,
-          pt: nil
+          pt: nil,
+          properties: nil
         },
         attributes: {}
       }
diff --git a/spec/engine_spec.rb b/spec/engine_spec.rb
index 7909d64d..3501468c 100644
--- a/spec/engine_spec.rb
+++ b/spec/engine_spec.rb
@@ -77,6 +77,22 @@
           treatment: 'off',
           config: nil
         )
+        expect(subject.get_treatment_with_config('nicolas', 'mauro_test', {}, nil)).to eq(
+          treatment: 'off',
+          config: nil
+        )
+        expect(subject.get_treatment_with_config('nicolas', 'mauro_test', {}, {})).to eq(
+          treatment: 'off',
+          config: nil
+        )
+        expect(subject.get_treatment_with_config('nicolas', 'mauro_test', {}, "prop")).to eq(
+          treatment: 'off',
+          config: nil
+        )
+        expect(subject.get_treatment_with_config('nicolas', 'mauro_test', {}, 123)).to eq(
+          treatment: 'off',
+          config: nil
+        )
         close_redis
       end
 
@@ -84,6 +100,10 @@
         expect(subject.get_treatment('nicolas', 'mauro_test', nil)).to eq 'off'
         expect(subject.get_treatment('nicolas', 'mauro_test')).to eq 'off'
         expect(subject.get_treatment('nicolas', 'mauro_test', {})).to eq 'off'
+        expect(subject.get_treatment('nicolas', 'mauro_test', {}, nil)).to eq 'off'
+        expect(subject.get_treatment('nicolas', 'mauro_test', {}, {})).to eq 'off'
+        expect(subject.get_treatment('nicolas', 'mauro_test', {}, "prop")).to eq 'off'
+        expect(subject.get_treatment('nicolas', 'mauro_test', {}, 123)).to eq 'off'
       end
 
       it 'get_treatments returns off' do
@@ -96,6 +116,18 @@
         expect(subject.get_treatments('nicolas', ['mauro_test'], {})).to eq(
           mauro_test: 'off'
         )
+        expect(subject.get_treatments('nicolas', ['mauro_test'], {}, nil)).to eq(
+          mauro_test: 'off'
+        )
+        expect(subject.get_treatments('nicolas', ['mauro_test'], {}, {})).to eq(
+          mauro_test: 'off'
+        )
+        expect(subject.get_treatments('nicolas', ['mauro_test'], {}, "prop")).to eq(
+          mauro_test: 'off'
+        )
+        expect(subject.get_treatments('nicolas', ['mauro_test'], {}, 123)).to eq(
+          mauro_test: 'off'
+        )
         close_redis
       end
 
@@ -109,6 +141,18 @@
         expect(subject.get_treatments_by_flag_set('nicolas', 'set_2', {})).to eq(
           mauro_test: 'off'
         )
+        expect(subject.get_treatments_by_flag_set('nicolas', 'set_2', {}, {})).to eq(
+          mauro_test: 'off'
+        )
+        expect(subject.get_treatments_by_flag_set('nicolas', 'set_2', {}, nil)).to eq(
+          mauro_test: 'off'
+        )
+        expect(subject.get_treatments_by_flag_set('nicolas', 'set_2', {}, "prop")).to eq(
+          mauro_test: 'off'
+        )
+        expect(subject.get_treatments_by_flag_set('nicolas', 'set_2', {}, 123)).to eq(
+          mauro_test: 'off'
+        )
         close_redis
       end
 
@@ -122,6 +166,18 @@
         expect(subject.get_treatments_by_flag_sets('nicolas', ['set_2'], {})).to eq(
           mauro_test: 'off'
         )
+        expect(subject.get_treatments_by_flag_sets('nicolas', ['set_2'], {}, {})).to eq(
+          mauro_test: 'off'
+        )
+        expect(subject.get_treatments_by_flag_sets('nicolas', ['set_2'], {}, nil)).to eq(
+          mauro_test: 'off'
+        )
+        expect(subject.get_treatments_by_flag_sets('nicolas', ['set_2'], {}, "prop")).to eq(
+          mauro_test: 'off'
+        )
+        expect(subject.get_treatments_by_flag_sets('nicolas', ['set_2'], {}, 123)).to eq(
+          mauro_test: 'off'
+        )
         close_redis
       end
     end
@@ -141,8 +197,7 @@
       end
 
       it 'returns CONTROL and label for incorrect feature name' do
-        treatment = subject.get_treatment('random_user_id', 'test_featur', nil, nil, false, true)
-        puts treatment
+        treatment = subject.get_treatment('random_user_id', 'test_featur', nil, nil, nil, false, true)
         expect(treatment).to eq(
           treatment: SplitIoClient::Engine::Models::Treatment::CONTROL,
           label: SplitIoClient::Engine::Models::Label::NOT_FOUND,
@@ -229,7 +284,7 @@
 
       #TODO We will remove multiple param in the future.
       it 'returns CONTROL and label on nil key' do
-        expect(subject.get_treatment(nil, 'test_feature', nil, nil, false, true)).to eq(
+        expect(subject.get_treatment(nil, 'test_feature', nil, nil, nil, false, true)).to eq(
           treatment: SplitIoClient::Engine::Models::Treatment::CONTROL,
           label: nil,
           change_number: nil
@@ -289,7 +344,7 @@
 
       #TODO We will remove multiple param in the future.
       it 'returns CONTROL and label on nil split_name' do
-        expect(subject.get_treatment('random_user_id', nil, nil, nil, false, true)).to eq(
+        expect(subject.get_treatment('random_user_id', nil, nil, nil, nil, false, true)).to eq(
           treatment: SplitIoClient::Engine::Models::Treatment::CONTROL,
           label: nil,
           change_number: nil
diff --git a/spec/splitclient/split_client_spec.rb b/spec/splitclient/split_client_spec.rb
index fd19dc0c..6c49fffd 100644
--- a/spec/splitclient/split_client_spec.rb
+++ b/spec/splitclient/split_client_spec.rb
@@ -35,6 +35,24 @@
       expect(split_client.get_treatments_by_flag_sets('key', ['set_2'])).to eq({:testing222 => 'off'})
       expect(split_client.get_treatments_with_config_by_flag_set('key', 'set_1')).to eq({:testing222 => {:treatment => 'off', :config => nil}})
       expect(split_client.get_treatments_with_config_by_flag_sets('key', ['set_2'])).to eq({:testing222 => {:treatment => 'off', :config => nil}})
+      imps = impressions_repository.batch
+
+      expect(split_client.get_treatment('key', 'testing222', {}, SplitIoClient::Engine::Models::EvaluationOptions.new({:prop => "value"}))).to eq('off')
+      check_properties(impressions_repository.batch)
+      expect(split_client.get_treatments('key_prop', ['testing222'], {}, SplitIoClient::Engine::Models::EvaluationOptions.new({:prop => "value"}))).to eq({:testing222 => 'off'})
+      check_properties(impressions_repository.batch)
+      expect(split_client.get_treatment_with_config('key', 'testing222', {}, SplitIoClient::Engine::Models::EvaluationOptions.new({:prop => "value"}))).to eq({:treatment => 'off', :config => nil})
+      check_properties(impressions_repository.batch)
+      expect(split_client.get_treatments_with_config('key', ['testing222'], {}, SplitIoClient::Engine::Models::EvaluationOptions.new({:prop => "value"}))).to eq({:testing222 => {:treatment => 'off', :config => nil}})
+      check_properties(impressions_repository.batch)
+      expect(split_client.get_treatments_by_flag_set('key', 'set_1', {}, SplitIoClient::Engine::Models::EvaluationOptions.new({:prop => "value"}))).to eq({:testing222 => 'off'})
+      check_properties(impressions_repository.batch)
+      expect(split_client.get_treatments_by_flag_sets('key', ['set_2'], {}, SplitIoClient::Engine::Models::EvaluationOptions.new({:prop => "value"}))).to eq({:testing222 => 'off'})
+      check_properties(impressions_repository.batch)
+      expect(split_client.get_treatments_with_config_by_flag_set('key', 'set_1', {}, SplitIoClient::Engine::Models::EvaluationOptions.new({:prop => "value"}))).to eq({:testing222 => {:treatment => 'off', :config => nil}})
+      check_properties(impressions_repository.batch)
+      expect(split_client.get_treatments_with_config_by_flag_sets('key', ['set_2'], {}, SplitIoClient::Engine::Models::EvaluationOptions.new({:prop => "value"}))).to eq({:testing222 => {:treatment => 'off', :config => nil}})
+      check_properties(impressions_repository.batch)
     end
 
     it 'check track' do
@@ -221,3 +239,7 @@ def mock_segment_changes(segment_name, segment_json, since)
   stub_request(:get, "https://sdk.split.io/api/segmentChanges/#{segment_name}?since=#{since}")
     .to_return(status: 200, body: segment_json)
 end
+
+def check_properties(imps)
+  expect(imps[0][:i][:properties]).to eq({:prop => "value"})
+end