diff --git a/lib/redis_client/cluster/errors.rb b/lib/redis_client/cluster/errors.rb
index 67f661c..4d5d746 100644
--- a/lib/redis_client/cluster/errors.rb
+++ b/lib/redis_client/cluster/errors.rb
@@ -12,6 +12,7 @@ def with_config(config)
     end
 
     ERR_ARG_NORMALIZATION = ->(arg) { Array[arg].flatten.reject { |e| e.nil? || (e.respond_to?(:empty?) && e.empty?) } }
+    Ractor.make_shareable(ERR_ARG_NORMALIZATION) if Object.const_defined?(:Ractor, false) && Ractor.respond_to?(:make_shareable)
 
     private_constant :ERR_ARG_NORMALIZATION
 
diff --git a/lib/redis_client/cluster/router.rb b/lib/redis_client/cluster/router.rb
index e32924c..e1e71b1 100644
--- a/lib/redis_client/cluster/router.rb
+++ b/lib/redis_client/cluster/router.rb
@@ -17,9 +17,19 @@ class Cluster
     class Router
       ZERO_CURSOR_FOR_SCAN = '0'
       TSF = ->(f, x) { f.nil? ? x : f.call(x) }.curry
+      Ractor.make_shareable(TSF) if Object.const_defined?(:Ractor, false) && Ractor.respond_to?(:make_shareable)
       DEDICATED_ACTIONS = lambda do # rubocop:disable Metrics/BlockLength
         action = Struct.new('RedisCommandRoutingAction', :method_name, :reply_transformer, keyword_init: true)
         pick_first = ->(reply) { reply.first } # rubocop:disable Style/SymbolProc
+        flatten_strings = ->(reply) { reply.flatten.sort_by(&:to_s) }
+        sum_num = ->(reply) { reply.select { |e| e.is_a?(Integer) }.sum }
+        sort_numbers = ->(reply) { reply.sort_by(&:to_i) }
+        if Object.const_defined?(:Ractor, false) && Ractor.respond_to?(:make_shareable)
+          Ractor.make_shareable(pick_first)
+          Ractor.make_shareable(flatten_strings)
+          Ractor.make_shareable(sum_num)
+          Ractor.make_shareable(sort_numbers)
+        end
         multiple_key_action = action.new(method_name: :send_multiple_keys_command)
         all_node_first_action = action.new(method_name: :send_command_to_all_nodes, reply_transformer: pick_first)
         primary_first_action = action.new(method_name: :send_command_to_primaries, reply_transformer: pick_first)
@@ -28,10 +38,10 @@ class Router
         {
           'ping' => action.new(method_name: :send_ping_command, reply_transformer: pick_first),
           'wait' => action.new(method_name: :send_wait_command),
-          'keys' => action.new(method_name: :send_command_to_replicas, reply_transformer: ->(reply) { reply.flatten.sort_by(&:to_s) }),
-          'dbsize' => action.new(method_name: :send_command_to_replicas, reply_transformer: ->(reply) { reply.select { |e| e.is_a?(Integer) }.sum }),
+          'keys' => action.new(method_name: :send_command_to_replicas, reply_transformer: flatten_strings),
+          'dbsize' => action.new(method_name: :send_command_to_replicas, reply_transformer: sum_num),
           'scan' => action.new(method_name: :send_scan_command),
-          'lastsave' => action.new(method_name: :send_command_to_all_nodes, reply_transformer: ->(reply) { reply.sort_by(&:to_i) }),
+          'lastsave' => action.new(method_name: :send_command_to_all_nodes, reply_transformer: sort_numbers),
           'role' => action.new(method_name: :send_command_to_all_nodes),
           'config' => action.new(method_name: :send_config_command),
           'client' => action.new(method_name: :send_client_command),
@@ -59,8 +69,8 @@ class Router
           'multi' => keyless_action,
           'unwatch' => keyless_action
         }.each_with_object({}) do |(k, v), acc|
-          acc[k] = v
-          acc[k.upcase] = v
+          acc[k] = v.freeze
+          acc[k.upcase] = v.freeze
         end
       end.call.freeze
 
diff --git a/lib/redis_client/cluster_config.rb b/lib/redis_client/cluster_config.rb
index 2a6462a..fe33cfe 100644
--- a/lib/redis_client/cluster_config.rb
+++ b/lib/redis_client/cluster_config.rb
@@ -14,7 +14,9 @@ class ClusterConfig
     DEFAULT_PORT = 6379
     DEFAULT_SCHEME = 'redis'
     SECURE_SCHEME = 'rediss'
-    DEFAULT_NODES = ["#{DEFAULT_SCHEME}://#{DEFAULT_HOST}:#{DEFAULT_PORT}"].freeze
+    DEFAULT_NODE = "#{DEFAULT_SCHEME}://#{DEFAULT_HOST}:#{DEFAULT_PORT}"
+    Ractor.make_shareable(DEFAULT_NODE) if Object.const_defined?(:Ractor, false) && Ractor.respond_to?(:make_shareable)
+    DEFAULT_NODES = [DEFAULT_NODE].freeze
     VALID_SCHEMES = [DEFAULT_SCHEME, SECURE_SCHEME].freeze
     VALID_NODES_KEYS = %i[ssl username password host port db].freeze
     MERGE_CONFIG_KEYS = %i[ssl username password].freeze