diff --git a/lib/chewy/fields/root.rb b/lib/chewy/fields/root.rb
index d6e125ba8..e821cb9ca 100644
--- a/lib/chewy/fields/root.rb
+++ b/lib/chewy/fields/root.rb
@@ -4,7 +4,7 @@ class Root < Chewy::Fields::Base
       attr_reader :dynamic_templates, :id
 
       def initialize(name, **options)
-        super(name, **options)
+        super
 
         @value ||= -> { self }
         @dynamic_templates = []
diff --git a/spec/chewy/fields/base_spec.rb b/spec/chewy/fields/base_spec.rb
index bd8149bd6..cf82bde2a 100644
--- a/spec/chewy/fields/base_spec.rb
+++ b/spec/chewy/fields/base_spec.rb
@@ -5,7 +5,7 @@
   specify { expect(described_class.new('name', type: 'integer').options[:type]).to eq('integer') }
 
   describe '#compose' do
-    let(:field) { described_class.new(:name, value: ->(o) { o.value }) }
+    let(:field) { described_class.new(:name, value: lambda(&:value)) }
 
     specify { expect(field.compose(double(value: 'hello'))).to eq(name: 'hello') }
     specify { expect(field.compose(double(value: %w[hello world]))).to eq(name: %w[hello world]) }
@@ -23,7 +23,7 @@
 
     context 'nested fields' do
       before do
-        field.children.push(described_class.new(:subname1, value: ->(o) { o.subvalue1 }))
+        field.children.push(described_class.new(:subname1, value: lambda(&:subvalue1)))
         field.children.push(described_class.new(:subname2, value: -> { subvalue2 }))
         field.children.push(described_class.new(:subname3))
       end
diff --git a/spec/chewy/index/observe/callback_spec.rb b/spec/chewy/index/observe/callback_spec.rb
index 825e3b405..84cd6219b 100644
--- a/spec/chewy/index/observe/callback_spec.rb
+++ b/spec/chewy/index/observe/callback_spec.rb
@@ -21,7 +21,7 @@
     end
 
     context 'when executable is has arity 1' do
-      let(:executable) { ->(record) { record.population } }
+      let(:executable) { lambda(&:population) }
 
       it 'calls exectuable within context' do
         expect(callback.call(city)).to eq(city.population)