diff --git a/spec/synvert/core/rewriter/instance_spec.rb b/spec/synvert/core/rewriter/instance_spec.rb
index 6dce6cfa..5ed35606 100644
--- a/spec/synvert/core/rewriter/instance_spec.rb
+++ b/spec/synvert/core/rewriter/instance_spec.rb
@@ -13,7 +13,7 @@ module Synvert::Core
 
     it 'parses within_node' do
       scope = double
-      block = Proc.new {}
+      block = proc {}
       expect(Rewriter::WithinScope).to receive(:new)
         .with(instance, { type: 'send', message: 'create' }, { recursive: true }, &block)
         .and_return(scope)
@@ -23,7 +23,7 @@ module Synvert::Core
 
     it 'parses with_node' do
       scope = double
-      block = Proc.new {}
+      block = proc {}
       expect(Rewriter::WithinScope).to receive(:new)
         .with(instance, { type: 'send', message: 'create' }, { recursive: true }, &block)
         .and_return(scope)
@@ -33,7 +33,7 @@ module Synvert::Core
 
     it 'parses within_direct_node' do
       scope = double
-      block = Proc.new {}
+      block = proc {}
       expect(Rewriter::WithinScope).to receive(:new)
         .with(instance, { type: 'send', message: 'create' }, { recursive: false }, &block)
         .and_return(scope)
@@ -43,7 +43,7 @@ module Synvert::Core
 
     it 'parses with_direct_node' do
       scope = double
-      block = Proc.new {}
+      block = proc {}
       expect(Rewriter::WithinScope).to receive(:new)
         .with(instance, { type: 'send', message: 'create' }, { recursive: false }, &block)
         .and_return(scope)
@@ -53,7 +53,7 @@ module Synvert::Core
 
     it 'parses goto_node' do
       scope = double
-      block = Proc.new {}
+      block = proc {}
       expect(Rewriter::GotoScope).to receive(:new).with(instance, :caller, &block).and_return(scope)
       expect(scope).to receive(:process)
       instance.goto_node(:caller, &block)
@@ -61,7 +61,7 @@ module Synvert::Core
 
     it 'parses if_exist_node' do
       condition = double
-      block = Proc.new {}
+      block = proc {}
       expect(Rewriter::IfExistCondition).to receive(:new)
         .with(instance, type: 'send', message: 'create', &block)
         .and_return(condition)
@@ -71,7 +71,7 @@ module Synvert::Core
 
     it 'parses unless_exist_node' do
       condition = double
-      block = Proc.new {}
+      block = proc {}
       expect(Rewriter::UnlessExistCondition).to receive(:new)
         .with(instance, type: 'send', message: 'create', &block)
         .and_return(condition)
@@ -81,7 +81,7 @@ module Synvert::Core
 
     it 'parses if_only_exist_node' do
       condition = double
-      block = Proc.new {}
+      block = proc {}
       expect(Rewriter::IfOnlyExistCondition).to receive(:new)
         .with(instance, type: 'send', message: 'create', &block)
         .and_return(condition)