diff --git a/.rubocop.yml b/.rubocop.yml
index a43dfa720..c85ec1515 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -31,6 +31,9 @@ Style/RaiseArgs:
 Style/RedundantArrayConstructor:
   Enabled: false  # doesn't work well with params definition
 
+Style/Send:
+  Enabled: true
+
 Metrics/AbcSize:
   Max: 45
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index dd24c4ef6..00b2351d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 * [#2581](https://github.com/ruby-grape/grape/pull/2581): Delegate `to_s` in Grape::API::Instance - [@ericproulx](https://github.com/ericproulx).
 * [#2582](https://github.com/ruby-grape/grape/pull/2582): Fix leaky slash when normalizing - [@ericproulx](https://github.com/ericproulx).
 * [#2583](https://github.com/ruby-grape/grape/pull/2583): Optimize api parameter documentation and memory usage - [@ericproulx](https://github.com/ericproulx).
+* [#2589](https://github.com/ruby-grape/grape/pull/2589): Replace `send` by `__send__` in codebase - [@ericproulx](https://github.com/ericproulx).
 * Your contribution here.
 
 #### Fixes
diff --git a/benchmark/issue_mounting.rb b/benchmark/issue_mounting.rb
new file mode 100755
index 000000000..0cfa285be
--- /dev/null
+++ b/benchmark/issue_mounting.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'bundler/inline'
+
+gemfile(true) do
+  source 'https://rubygems.org'
+  gem 'grape'
+  gem 'rack'
+  gem 'minitest'
+  gem 'rack-test'
+end
+
+require 'minitest/autorun'
+require 'rack/test'
+require 'grape'
+
+class GrapeAPIBugTest < Minitest::Test
+  include Rack::Test::Methods
+
+  RootAPI = Class.new(Grape::API) do
+    format :json
+
+    delete :test do
+      status 200
+      []
+    end
+  end
+
+  def test_v1_users_via_api
+    env = Rack::MockRequest.env_for('/test', method: Rack::DELETE)
+    response = Rack::MockResponse[*RootAPI.call(env)]
+
+    assert_equal '[]', response.body
+    assert_equal 200, response.status
+  end
+end
diff --git a/lib/grape/api.rb b/lib/grape/api.rb
index 81d101abb..5395be00e 100644
--- a/lib/grape/api.rb
+++ b/lib/grape/api.rb
@@ -132,7 +132,7 @@ def replay_step_on(instance, method:, args:, block:)
         return if skip_immediate_run?(instance, args)
 
         eval_args = evaluate_arguments(instance.configuration, *args)
-        response = instance.send(method, *eval_args, &block)
+        response = instance.__send__(method, *eval_args, &block)
         if skip_immediate_run?(instance, [response])
           response
         else
diff --git a/lib/grape/dsl/settings.rb b/lib/grape/dsl/settings.rb
index bbd29d1a7..50f055933 100644
--- a/lib/grape/dsl/settings.rb
+++ b/lib/grape/dsl/settings.rb
@@ -33,7 +33,7 @@ def inheritable_setting
       # @param type [Symbol]
       # @param key [Symbol]
       def unset(type, key)
-        setting = inheritable_setting.send(type)
+        setting = inheritable_setting.__send__(type)
         setting.delete key
       end
 
@@ -42,7 +42,7 @@ def unset(type, key)
       # @param value [Object] will be stored if the value is currently empty
       # @return either the old value, if it wasn't nil, or the given value
       def get_or_set(type, key, value)
-        setting = inheritable_setting.send(type)
+        setting = inheritable_setting.__send__(type)
         if value.nil?
           setting[key]
         else
diff --git a/lib/grape/exceptions/base.rb b/lib/grape/exceptions/base.rb
index 27ef78b45..9ad4ecfcf 100644
--- a/lib/grape/exceptions/base.rb
+++ b/lib/grape/exceptions/base.rb
@@ -17,7 +17,7 @@ def initialize(status: nil, message: nil, headers: nil)
       end
 
       def [](index)
-        send index
+        __send__ index
       end
 
       protected
diff --git a/spec/grape/api_spec.rb b/spec/grape/api_spec.rb
index e5cc2a51c..dad8aba21 100644
--- a/spec/grape/api_spec.rb
+++ b/spec/grape/api_spec.rb
@@ -195,7 +195,7 @@
     %w[group resource resources segment].each do |als|
       it "`.#{als}` is an alias" do
         inner_namespace = nil
-        subject.send(als, :awesome) do
+        subject.__send__(als, :awesome) do
           inner_namespace = namespace
         end
         expect(inner_namespace).to eq '/awesome'
@@ -485,10 +485,10 @@ def to_txt
         objects.each do |object|
           it "allows a(n) #{object.class} json object in params" do
             subject.format :json
-            subject.send(verb) do
+            subject.__send__(verb) do
               env[Grape::Env::API_REQUEST_BODY]
             end
-            send verb, '/', Grape::Json.dump(object), 'CONTENT_TYPE' => 'application/json'
+            __send__ verb, '/', Grape::Json.dump(object), 'CONTENT_TYPE' => 'application/json'
             expect(last_response.status).to eq(verb == :post ? 201 : 200)
             expect(last_response.body).to eql Grape::Json.dump(object)
             expect(last_request.params).to eql({})
@@ -496,10 +496,10 @@ def to_txt
 
           it 'stores input in api.request.input' do
             subject.format :json
-            subject.send(verb) do
+            subject.__send__(verb) do
               env[Grape::Env::API_REQUEST_INPUT]
             end
-            send verb, '/', Grape::Json.dump(object), 'CONTENT_TYPE' => 'application/json'
+            __send__ verb, '/', Grape::Json.dump(object), 'CONTENT_TYPE' => 'application/json'
             expect(last_response.status).to eq(verb == :post ? 201 : 200)
             expect(last_response.body).to eql Grape::Json.dump(object).to_json
           end
@@ -507,10 +507,10 @@ def to_txt
           context 'chunked transfer encoding' do
             it 'stores input in api.request.input' do
               subject.format :json
-              subject.send(verb) do
+              subject.__send__(verb) do
                 env[Grape::Env::API_REQUEST_INPUT]
               end
-              send verb, '/', Grape::Json.dump(object), 'CONTENT_TYPE' => 'application/json', 'HTTP_TRANSFER_ENCODING' => 'chunked'
+              __send__ verb, '/', Grape::Json.dump(object), 'CONTENT_TYPE' => 'application/json', 'HTTP_TRANSFER_ENCODING' => 'chunked'
               expect(last_response.status).to eq(verb == :post ? 201 : 200)
               expect(last_response.body).to eql Grape::Json.dump(object).to_json
             end
@@ -549,7 +549,7 @@ def to_txt
       end
 
       %w[get post put delete options patch].each do |m|
-        send(m, '/abc')
+        __send__(m, '/abc')
         expect(last_response.body).to eql 'lol'
       end
     end
@@ -588,14 +588,14 @@ def to_txt
     verbs = %w[post get head delete put options patch]
     verbs.each do |verb|
       it "allows and properly constrain a #{verb.upcase} method" do
-        subject.send(verb, '/example') do
+        subject.__send__(verb, '/example') do
           verb
         end
-        send(verb, '/example')
+        __send__(verb, '/example')
         expect(last_response.body).to eql verb == 'head' ? '' : verb
         # Call it with all methods other than the properly constrained one.
         (verbs - [verb]).each do |other_verb|
-          send(other_verb, '/example')
+          __send__(other_verb, '/example')
           expected_rc = if other_verb == 'options' then 204
                         elsif other_verb == 'head' && verb == 'get' then 200
                         else
@@ -1050,7 +1050,7 @@ def to_txt
     end
 
     it 'returns compiled!' do
-      expect(app.send(:compile!)).to eq(:compiled!)
+      expect(app.__send__(:compile!)).to eq(:compiled!)
     end
   end
 
@@ -1059,7 +1059,7 @@ def to_txt
   describe 'instance_for_rack' do
     context 'when the app was not mounted' do
       it 'returns the base_instance' do
-        expect(app.send(:instance_for_rack)).to eq app.base_instance
+        expect(app.__send__(:instance_for_rack)).to eq app.base_instance
       end
     end
 
@@ -1071,7 +1071,7 @@ def to_txt
             mount mounted_app
           end
         end
-        expect(app.send(:instance_for_rack)).to eq app.send(:mounted_instances).first
+        expect(app.__send__(:instance_for_rack)).to eq app.__send__(:mounted_instances).first
       end
     end
   end
diff --git a/spec/grape/endpoint_spec.rb b/spec/grape/endpoint_spec.rb
index eecb9102f..f6da9365c 100644
--- a/spec/grape/endpoint_spec.rb
+++ b/spec/grape/endpoint_spec.rb
@@ -929,26 +929,26 @@ def memoized
     describe 'all other' do
       %w[post get head put options patch].each do |verb|
         it "allows for the anchoring option with a #{verb.upcase} method" do
-          subject.send(verb, '/example', anchor: true) do
+          subject.__send__(verb, '/example', anchor: true) do
             verb
           end
-          send(verb, '/example/and/some/more')
+          __send__(verb, '/example/and/some/more')
           expect(last_response.status).to be 404
         end
 
         it "anchors paths by default for the #{verb.upcase} method" do
-          subject.send(verb, '/example') do
+          subject.__send__(verb, '/example') do
             verb
           end
-          send(verb, '/example/and/some/more')
+          __send__(verb, '/example/and/some/more')
           expect(last_response.status).to be 404
         end
 
         it "responds to /example/and/some/more for the non-anchored #{verb.upcase} method" do
-          subject.send(verb, '/example', anchor: false) do
+          subject.__send__(verb, '/example', anchor: false) do
             verb
           end
-          send(verb, '/example/and/some/more')
+          __send__(verb, '/example/and/some/more')
           expect(last_response.status).to eql verb == 'post' ? 201 : 200
           expect(last_response.body).to eql verb == 'head' ? '' : verb
         end
diff --git a/spec/grape/exceptions/base_spec.rb b/spec/grape/exceptions/base_spec.rb
index 2378fdf6a..3a6a7849d 100644
--- a/spec/grape/exceptions/base_spec.rb
+++ b/spec/grape/exceptions/base_spec.rb
@@ -18,7 +18,7 @@
   end
 
   describe '#compose_message' do
-    subject { described_class.new.send(:compose_message, key, **attributes) }
+    subject { described_class.new.__send__(:compose_message, key, **attributes) }
 
     let(:key) { :invalid_formatter }
     let(:attributes) { { klass: String, to_format: 'xml' } }
diff --git a/spec/grape/validations/params_scope_spec.rb b/spec/grape/validations/params_scope_spec.rb
index 3caec4dd7..0e9443631 100644
--- a/spec/grape/validations/params_scope_spec.rb
+++ b/spec/grape/validations/params_scope_spec.rb
@@ -1249,7 +1249,7 @@ def initialize(value)
         before do
           # puts "a_decl: #{a_decl}, a_opts: #{a_opts}, b_opts: #{b_opts}"
           subject.params do
-            send a_decl, :a, **a_opts
+            __send__ a_decl, :a, **a_opts
             given(a: ->(val) { val == 'x' }) { requires :b, **b_opts }
             given(a: ->(val) { val == 'y' }) { requires :c, **b_opts }
           end
diff --git a/spec/support/content_type_helpers.rb b/spec/support/content_type_helpers.rb
index 9721edacd..7f71417e2 100644
--- a/spec/support/content_type_helpers.rb
+++ b/spec/support/content_type_helpers.rb
@@ -7,7 +7,7 @@ module Helpers
         define_method :"#{method}_with_json" do |uri, params = {}, env = {}, &block|
           params = params.to_json
           env['CONTENT_TYPE'] ||= 'application/json'
-          send(method, uri, params, env, &block)
+          __send__(method, uri, params, env, &block)
         end
       end
     end