diff --git a/lib/temporal/configuration.rb b/lib/temporal/configuration.rb
index 0506b61f..5de11112 100644
--- a/lib/temporal/configuration.rb
+++ b/lib/temporal/configuration.rb
@@ -17,7 +17,8 @@ class Configuration
     Execution = Struct.new(:namespace, :task_queue, :timeouts, :headers, :search_attributes, keyword_init: true)
 
     attr_reader :timeouts, :error_handlers, :capabilities, :payload_codec
-    attr_accessor :connection_type, :use_error_serialization_v2, :host, :port, :credentials, :identity,
+    attr_writer :credentials
+    attr_accessor :connection_type, :use_error_serialization_v2, :host, :port, :identity,
                   :logger, :metrics_adapter, :namespace, :task_queue, :headers, :search_attributes, :header_propagators,
                   :legacy_signals, :no_signals_in_first_task, :connection_options, :log_on_workflow_replay
 
@@ -118,6 +119,12 @@ def timeouts=(new_timeouts)
       @timeouts = DEFAULT_TIMEOUTS.merge(new_timeouts)
     end
 
+    def credentials
+      return @credentials.call if @credentials.is_a?(Proc)
+
+      @credentials
+    end
+
     def for_connection
       Connection.new(
         type: connection_type,
diff --git a/spec/unit/lib/temporal/configuration_spec.rb b/spec/unit/lib/temporal/configuration_spec.rb
index 8ab2e282..ca0a6078 100644
--- a/spec/unit/lib/temporal/configuration_spec.rb
+++ b/spec/unit/lib/temporal/configuration_spec.rb
@@ -61,6 +61,20 @@ def inject!(_); end
       subject.identity = new_identity
       expect(subject.for_connection).to have_attributes(identity: new_identity)
     end
+
+    it 'default credentials' do
+      expect(subject.for_connection).to have_attributes(credentials: :this_channel_is_insecure)
+    end
+
+    it 'override credentials' do
+      subject.credentials = :test_credentials
+      expect(subject.for_connection).to have_attributes(credentials: :test_credentials)
+    end
+
+    it 'override credentials with lambda' do
+      subject.credentials = -> { :test_credentials }
+      expect(subject.for_connection).to have_attributes(credentials: :test_credentials)
+    end
   end
 
   describe '#converter' do