diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53d02d5998..5054c1dac9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 * [#2089](https://github.com/ruby-grape/grape/pull/2089): Specify order of mounting Grape with Rack::Cascade in README - [@jonmchan](https://github.com/jonmchan).
 * [#2083](https://github.com/ruby-grape/grape/pull/2083): Set `Cache-Control` header only for streamed responses - [@stanhu](https://github.com/stanhu).
 * [#2092](https://github.com/ruby-grape/grape/pull/2092): Correct an example params in Include Missing doc - [@huyvohcmc](https://github.com/huyvohcmc).
+* [#2091](https://github.com/ruby-grape/grape/pull/2091): Fix ruby 2.7 keyword deprecations - [@dim](https://github.com/dim).
 
 ### 1.4.0 (2020/07/10)
 
diff --git a/lib/grape/api.rb b/lib/grape/api.rb
index 507b221871..45dd76c74d 100644
--- a/lib/grape/api.rb
+++ b/lib/grape/api.rb
@@ -90,7 +90,7 @@ def const_missing(*args)
       # For instance, a descripcion could be done using: `desc configuration[:description]` if it may vary
       # depending on where the endpoint is mounted. Use with care, if you find yourself using configuration
       # too much, you may actually want to provide a new API rather than remount it.
-      def mount_instance(opts = {})
+      def mount_instance(**opts)
         instance = Class.new(@base_parent)
         instance.configuration = Grape::Util::EndpointConfiguration.new(opts[:configuration] || {})
         instance.base = self
diff --git a/lib/grape/dsl/routing.rb b/lib/grape/dsl/routing.rb
index b2f955cc0a..76a22a79f0 100644
--- a/lib/grape/dsl/routing.rb
+++ b/lib/grape/dsl/routing.rb
@@ -79,7 +79,7 @@ def do_not_route_options!
           namespace_inheritable(:do_not_route_options, true)
         end
 
-        def mount(mounts, opts = {})
+        def mount(mounts, **opts)
           mounts = { mounts => '/' } unless mounts.respond_to?(:each_pair)
           mounts.each_pair do |app, path|
             if app.respond_to?(:mount_instance)
@@ -170,9 +170,7 @@ def namespace(space = nil, options = {}, &block)
               previous_namespace_description = @namespace_description
               @namespace_description = (@namespace_description || {}).deep_merge(namespace_setting(:description) || {})
               nest(block) do
-                if space
-                  namespace_stackable(:namespace, Namespace.new(space, **options))
-                end
+                namespace_stackable(:namespace, Namespace.new(space, **options)) if space
               end
               @namespace_description = previous_namespace_description
             end
diff --git a/lib/grape/middleware/base.rb b/lib/grape/middleware/base.rb
index 2b5657e734..e21a94e9e9 100644
--- a/lib/grape/middleware/base.rb
+++ b/lib/grape/middleware/base.rb
@@ -14,7 +14,7 @@ class Base
 
       # @param [Rack Application] app The standard argument for a Rack middleware.
       # @param [Hash] options A hash of options, simply stored for use by subclasses.
-      def initialize(app, options = {})
+      def initialize(app, **options)
         @app = app
         @options = default_options.merge(options)
         @app_response = nil
diff --git a/lib/grape/middleware/error.rb b/lib/grape/middleware/error.rb
index 6d816f14f3..54bded3c87 100644
--- a/lib/grape/middleware/error.rb
+++ b/lib/grape/middleware/error.rb
@@ -19,11 +19,11 @@ def default_options
           rescue_subclasses: true, # rescue subclasses of exceptions listed
           rescue_options: {
             backtrace: false, # true to display backtrace, true to let Grape handle Grape::Exceptions
-            original_exception: false, # true to display exception
+            original_exception: false # true to display exception
           },
           rescue_handlers: {}, # rescue handler blocks
           base_only_rescue_handlers: {}, # rescue handler blocks rescuing only the base class
-          all_rescue_handler: nil, # rescue handler block to rescue from all exceptions
+          all_rescue_handler: nil # rescue handler block to rescue from all exceptions
         }
       end
 
@@ -38,15 +38,15 @@ def call!(env)
           error_response(catch(:error) do
             return @app.call(@env)
           end)
-        rescue Exception => error # rubocop:disable Lint/RescueException
+        rescue Exception => e # rubocop:disable Lint/RescueException
           handler =
-            rescue_handler_for_base_only_class(error.class) ||
-            rescue_handler_for_class_or_its_ancestor(error.class) ||
-            rescue_handler_for_grape_exception(error.class) ||
-            rescue_handler_for_any_class(error.class) ||
+            rescue_handler_for_base_only_class(e.class) ||
+            rescue_handler_for_class_or_its_ancestor(e.class) ||
+            rescue_handler_for_grape_exception(e.class) ||
+            rescue_handler_for_any_class(e.class) ||
             raise
 
-          run_rescue_handler(handler, error)
+          run_rescue_handler(handler, e)
         end
       end
 
@@ -65,15 +65,13 @@ def error_response(error = {})
         message = error[:message] || options[:default_message]
         headers = { Grape::Http::Headers::CONTENT_TYPE => content_type }
         headers.merge!(error[:headers]) if error[:headers].is_a?(Hash)
-        backtrace = error[:backtrace] || error[:original_exception] && error[:original_exception].backtrace || []
+        backtrace = error[:backtrace] || error[:original_exception]&.backtrace || []
         original_exception = error.is_a?(Exception) ? error : error[:original_exception] || nil
         rack_response(format_message(message, backtrace, original_exception), status, headers)
       end
 
       def rack_response(message, status = options[:default_status], headers = { Grape::Http::Headers::CONTENT_TYPE => content_type })
-        if headers[Grape::Http::Headers::CONTENT_TYPE] == TEXT_HTML
-          message = ERB::Util.html_escape(message)
-        end
+        message = ERB::Util.html_escape(message) if headers[Grape::Http::Headers::CONTENT_TYPE] == TEXT_HTML
         Rack::Response.new([message], status, headers)
       end
 
diff --git a/lib/grape/middleware/stack.rb b/lib/grape/middleware/stack.rb
index 488a514985..b725e87874 100644
--- a/lib/grape/middleware/stack.rb
+++ b/lib/grape/middleware/stack.rb
@@ -6,11 +6,12 @@ module Middleware
     # It allows to insert and insert after
     class Stack
       class Middleware
-        attr_reader :args, :block, :klass
+        attr_reader :args, :opts, :block, :klass
 
-        def initialize(klass, *args, &block)
+        def initialize(klass, *args, **opts, &block)
           @klass = klass
-          @args = args
+          @args  = args
+          @opts  = opts
           @block = block
         end
 
@@ -30,6 +31,18 @@ def ==(other)
         def inspect
           klass.to_s
         end
+
+        if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('2.7')
+          def use_in(builder)
+            block ? builder.use(klass, *args, **opts, &block) : builder.use(klass, *args, **opts)
+          end
+        else
+          def use_in(builder)
+            args  = self.args
+            args += [opts] unless opts.empty?
+            block ? builder.use(klass, *args, &block) : builder.use(klass, *args)
+          end
+        end
       end
 
       include Enumerable
@@ -90,7 +103,7 @@ def merge_with(middleware_specs)
       def build(builder = Rack::Builder.new)
         others.shift(others.size).each(&method(:merge_with))
         middlewares.each do |m|
-          m.block ? builder.use(m.klass, *m.args, &m.block) : builder.use(m.klass, *m.args)
+          m.use_in(builder)
         end
         builder
       end
diff --git a/lib/grape/request.rb b/lib/grape/request.rb
index 62a6cd3144..b547797482 100644
--- a/lib/grape/request.rb
+++ b/lib/grape/request.rb
@@ -8,7 +8,7 @@ class Request < Rack::Request
 
     alias rack_params params
 
-    def initialize(env, options = {})
+    def initialize(env, **options)
       extend options[:build_params_with] || Grape.config.param_builder
       super(env)
     end
diff --git a/lib/grape/router.rb b/lib/grape/router.rb
index c5d9e96422..8c5dce872d 100644
--- a/lib/grape/router.rb
+++ b/lib/grape/router.rb
@@ -47,7 +47,7 @@ def append(route)
 
     def associate_routes(pattern, **options)
       @neutral_regexes << Regexp.new("(?<_#{@neutral_map.length}>)#{pattern.to_regexp}")
-      @neutral_map << Grape::Router::AttributeTranslator.new(options.merge(pattern: pattern, index: @neutral_map.length))
+      @neutral_map << Grape::Router::AttributeTranslator.new(**options, pattern: pattern, index: @neutral_map.length)
     end
 
     def call(env)
diff --git a/lib/grape/router/attribute_translator.rb b/lib/grape/router/attribute_translator.rb
index 93d112fcb4..88003887c6 100644
--- a/lib/grape/router/attribute_translator.rb
+++ b/lib/grape/router/attribute_translator.rb
@@ -23,7 +23,7 @@ class AttributeTranslator
 
       ROUTER_ATTRIBUTES = %i[pattern index].freeze
 
-      def initialize(attributes = {})
+      def initialize(**attributes)
         @attributes = attributes
       end
 
@@ -37,7 +37,7 @@ def to_h
         attributes
       end
 
-      def method_missing(method_name, *args) # rubocop:disable Style/MethodMissing
+      def method_missing(method_name, *args)
         if setter?(method_name[-1])
           attributes[method_name[0..-1]] = *args
         else
diff --git a/lib/grape/util/base_inheritable.rb b/lib/grape/util/base_inheritable.rb
index d5c86beeda..5db6e3455d 100644
--- a/lib/grape/util/base_inheritable.rb
+++ b/lib/grape/util/base_inheritable.rb
@@ -9,8 +9,8 @@ class BaseInheritable
 
       # @param inherited_values [Object] An object implementing an interface
       #   of the Hash class.
-      def initialize(inherited_values = {})
-        @inherited_values = inherited_values
+      def initialize(inherited_values = nil)
+        @inherited_values = inherited_values || {}
         @new_values = {}
       end
 
diff --git a/lib/grape/validations/validators/as.rb b/lib/grape/validations/validators/as.rb
index 07ac8006d3..77cef5f1cc 100644
--- a/lib/grape/validations/validators/as.rb
+++ b/lib/grape/validations/validators/as.rb
@@ -3,7 +3,7 @@
 module Grape
   module Validations
     class AsValidator < Base
-      def initialize(attrs, options, required, scope, opts = {})
+      def initialize(attrs, options, required, scope, **opts)
         @renamed_options = options
         super
       end
diff --git a/lib/grape/validations/validators/base.rb b/lib/grape/validations/validators/base.rb
index 034a66e5a0..4799f49238 100644
--- a/lib/grape/validations/validators/base.rb
+++ b/lib/grape/validations/validators/base.rb
@@ -13,7 +13,7 @@ class Base
       # @param required [Boolean] attribute(s) are required or optional
       # @param scope [ParamsScope] parent scope for this Validator
       # @param opts [Hash] additional validation options
-      def initialize(attrs, options, required, scope, opts = {})
+      def initialize(attrs, options, required, scope, **opts)
         @attrs = Array(attrs)
         @option = options
         @required = required
@@ -47,9 +47,7 @@ def validate!(params)
           next if !@scope.required? && empty_val
           next unless @scope.meets_dependency?(val, params)
           begin
-            if @required || val.respond_to?(:key?) && val.key?(attr_name)
-              validate_param!(attr_name, val)
-            end
+            validate_param!(attr_name, val) if @required || val.respond_to?(:key?) && val.key?(attr_name)
           rescue Grape::Exceptions::Validation => e
             array_errors << e
           end
diff --git a/lib/grape/validations/validators/default.rb b/lib/grape/validations/validators/default.rb
index ee620db460..79d6951f37 100644
--- a/lib/grape/validations/validators/default.rb
+++ b/lib/grape/validations/validators/default.rb
@@ -3,7 +3,7 @@
 module Grape
   module Validations
     class DefaultValidator < Base
-      def initialize(attrs, options, required, scope, opts = {})
+      def initialize(attrs, options, required, scope, **opts)
         @default = options
         super
       end
@@ -21,9 +21,7 @@ def validate_param!(attr_name, params)
       def validate!(params)
         attrs = SingleAttributeIterator.new(self, @scope, params)
         attrs.each do |resource_params, attr_name|
-          if resource_params.is_a?(Hash) && resource_params[attr_name].nil?
-            validate_param!(attr_name, resource_params)
-          end
+          validate_param!(attr_name, resource_params) if resource_params.is_a?(Hash) && resource_params[attr_name].nil?
         end
       end
 
diff --git a/lib/grape/validations/validators/except_values.rb b/lib/grape/validations/validators/except_values.rb
index 4ef94e97a0..5ba1e306b3 100644
--- a/lib/grape/validations/validators/except_values.rb
+++ b/lib/grape/validations/validators/except_values.rb
@@ -3,7 +3,7 @@
 module Grape
   module Validations
     class ExceptValuesValidator < Base
-      def initialize(attrs, options, required, scope, opts = {})
+      def initialize(attrs, options, required, scope, **opts)
         @except = options.is_a?(Hash) ? options[:value] : options
         super
       end
diff --git a/lib/grape/validations/validators/values.rb b/lib/grape/validations/validators/values.rb
index 7889f3badc..f3d676d0b5 100644
--- a/lib/grape/validations/validators/values.rb
+++ b/lib/grape/validations/validators/values.rb
@@ -3,7 +3,7 @@
 module Grape
   module Validations
     class ValuesValidator < Base
-      def initialize(attrs, options, required, scope, opts = {})
+      def initialize(attrs, options, required, scope, **opts)
         if options.is_a?(Hash)
           @excepts = options[:except]
           @values = options[:value]
diff --git a/spec/grape/middleware/error_spec.rb b/spec/grape/middleware/error_spec.rb
index 66901292bf..d586b98204 100644
--- a/spec/grape/middleware/error_spec.rb
+++ b/spec/grape/middleware/error_spec.rb
@@ -30,7 +30,7 @@ def app
     opts = options
     Rack::Builder.app do
       use Spec::Support::EndpointFaker
-      use Grape::Middleware::Error, opts
+      use Grape::Middleware::Error, **opts
       run ErrorSpec::ErrApp
     end
   end
diff --git a/spec/grape/middleware/stack_spec.rb b/spec/grape/middleware/stack_spec.rb
index e408ef9e89..3833337e47 100644
--- a/spec/grape/middleware/stack_spec.rb
+++ b/spec/grape/middleware/stack_spec.rb
@@ -34,7 +34,8 @@ def initialize(&block)
       expect { subject.use StackSpec::BarMiddleware, false, my_arg: 42 }
         .to change { subject.size }.by(1)
       expect(subject.last).to eq(StackSpec::BarMiddleware)
-      expect(subject.last.args).to eq([false, { my_arg: 42 }])
+      expect(subject.last.args).to eq([false])
+      expect(subject.last.opts).to eq(my_arg: 42)
     end
 
     it 'pushes a middleware class with block arguments onto the stack' do
diff --git a/spec/support/versioned_helpers.rb b/spec/support/versioned_helpers.rb
index f3055c6e52..8d7c07f184 100644
--- a/spec/support/versioned_helpers.rb
+++ b/spec/support/versioned_helpers.rb
@@ -6,7 +6,7 @@ module Support
     module Helpers
       # Returns the path with options[:version] prefixed if options[:using] is :path.
       # Returns normal path otherwise.
-      def versioned_path(options = {})
+      def versioned_path(**options)
         case options[:using]
         when :path
           File.join('/', options[:prefix] || '', options[:version], options[:path])
@@ -43,13 +43,11 @@ def versioned_headers(**options)
         end
       end
 
-      def versioned_get(path, version_name, version_options = {})
+      def versioned_get(path, version_name, **version_options)
         path    = versioned_path(version_options.merge(version: version_name, path: path))
         headers = versioned_headers(**version_options.merge(version: version_name))
         params = {}
-        if version_options[:using] == :param
-          params = { version_options[:parameter] => version_name }
-        end
+        params = { version_options[:parameter] => version_name } if version_options[:using] == :param
         get path, params, headers
       end
     end