diff --git a/Gemfile.lock b/Gemfile.lock
index 2cddea7..10aee23 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,7 +27,7 @@ GIT
 PATH
   remote: .
   specs:
-    active_dry_form (1.2.1)
+    active_dry_form (1.4.0)
       actionpack
       activerecord
       dry-configurable
@@ -198,6 +198,7 @@ GEM
 
 PLATFORMS
   arm64-darwin-21
+  arm64-darwin-24
   x86_64-linux
 
 DEPENDENCIES
diff --git a/lib/active_dry_form/base_form.rb b/lib/active_dry_form/base_form.rb
index 0cc0d48..2014c8b 100644
--- a/lib/active_dry_form/base_form.rb
+++ b/lib/active_dry_form/base_form.rb
@@ -48,6 +48,10 @@ def attributes=(attrs)
       attrs.each do |attr, v|
         next if !ActiveDryForm.config.strict_param_keys && !respond_to?(:"#{attr}=")
 
+        # Params for nested forms comes as a hash from frontend, convert them to array
+        # { '0' => { url: 'https://omniplatform.ru' }, '1' => { url: 'https://google.com' } } => [{ ... }, { ... }]
+        v = v.values if v.is_a?(Hash) && self.class::NESTED_FORM_ARRAYS.include?(attr.to_sym)
+
         public_send(:"#{attr}=", v)
       end
     end
@@ -143,6 +147,7 @@ def []=(key, value)
 
     def self.define_methods
       const_set :NESTED_FORM_KEYS, []
+      const_set :NESTED_FORM_ARRAYS, Set.new
 
       self::FIELDS_INFO[:properties].each do |key, value|
         define_method :"#{key}=" do |v|
@@ -168,6 +173,9 @@ def self.define_methods
             namespace: key,
             is_array:  value[:type] == 'array',
           }
+          if value[:type] == 'array'
+            self::NESTED_FORM_ARRAYS << key.to_sym
+          end
           nested_key = key
         end
 
diff --git a/lib/active_dry_form/builder.rb b/lib/active_dry_form/builder.rb
index a364892..70aa48e 100644
--- a/lib/active_dry_form/builder.rb
+++ b/lib/active_dry_form/builder.rb
@@ -81,13 +81,9 @@ def fields_for(association_name, fields_options = {}, &block)
       if association.is_a?(BaseForm)
         fields_for_nested_model("#{@object_name}[#{association_name}]", association, fields_options, block)
       elsif association.respond_to?(:to_ary)
-        field_name_regexp = Regexp.new(Regexp.escape("#{@object_name}[#{association_name}][") << '\d+\]') # хак для замены хеша на массив
-        output = ActiveSupport::SafeBuffer.new
-        Array.wrap(association).each do |child|
-          output << fields_for_nested_model("#{@object_name}[#{association_name}][]", child, fields_options, block)
-            .gsub(field_name_regexp, "#{@object_name}[#{association_name}][]").html_safe
+        Array.wrap(association).each_with_index.reduce(ActiveSupport::SafeBuffer.new) do |output, (child, i)|
+          output << fields_for_nested_model("#{@object_name}[#{association_name}][#{i}]", child, fields_options, block)
         end
-        output
       end
     end
 
diff --git a/lib/active_dry_form/version.rb b/lib/active_dry_form/version.rb
index 52cba17..602a810 100644
--- a/lib/active_dry_form/version.rb
+++ b/lib/active_dry_form/version.rb
@@ -2,6 +2,6 @@
 
 module ActiveDryForm
 
-  VERSION = '1.3.0'
+  VERSION = '1.4.0'
 
 end
diff --git a/spec/active_dry_form/form_helper_spec.rb b/spec/active_dry_form/form_helper_spec.rb
index 8b63d8d..38193f0 100644
--- a/spec/active_dry_form/form_helper_spec.rb
+++ b/spec/active_dry_form/form_helper_spec.rb
@@ -488,8 +488,8 @@ def polymorphic_path(*)
 
         expected_html = <<-HTML
           <div class="form-input input_url form-input-required">
-            <label for="user_bookmarks__url">Bookmarks URL</label>
-            <input required="required" type="url" value="https://example.com" name="user[bookmarks][][url]" id="user_bookmarks__url" />
+            <label for="user_bookmarks_0_url">Bookmarks URL</label>
+            <input required="required" type="url" value="https://example.com" name="user[bookmarks][0][url]" id="user_bookmarks_0_url" />
           </div>
         HTML
 
@@ -509,8 +509,8 @@ def polymorphic_path(*)
 
         expected_html = <<-HTML
           <div class="form-input input_url form-input-required form-input-error">
-            <label for="user_bookmarks__url">Bookmarks URL</label>
-            <input required="required" type="url" name="user[bookmarks][][url]" id="user_bookmarks__url" />
+            <label for="user_bookmarks_0_url">Bookmarks URL</label>
+            <input required="required" type="url" name="user[bookmarks][0][url]" id="user_bookmarks_0_url" />
             <div class="form-error">должно быть заполнено</div>
           </div>
         HTML
@@ -533,8 +533,8 @@ def polymorphic_path(*)
 
         expected_html = <<-HTML
           <div class="form-input input_text form-input-required">
-            <label for="user_favorites__kind">Favorites Kind</label>
-            <input required="required" type="text" value="book" name="user[favorites][][kind]" id="user_favorites__kind" />
+            <label for="user_favorites_0_kind">Favorites Kind</label>
+            <input required="required" type="text" value="book" name="user[favorites][0][kind]" id="user_favorites_0_kind" />
           </div>
         HTML
 
@@ -554,8 +554,8 @@ def polymorphic_path(*)
 
         expected_html = <<-HTML
           <div class="form-input input_text form-input-required form-input-error">
-            <label for="user_favorites__kind">Favorites Kind</label>
-            <input required="required" type="text" name="user[favorites][][kind]" id="user_favorites__kind" />
+            <label for="user_favorites_0_kind">Favorites Kind</label>
+            <input required="required" type="text" name="user[favorites][0][kind]" id="user_favorites_0_kind" />
             <div class="form-error">должно быть заполнено</div>
           </div>
         HTML
diff --git a/spec/active_dry_form_nested_dry_form_spec.rb b/spec/active_dry_form_nested_dry_form_spec.rb
index 3739ebe..c24e2ac 100644
--- a/spec/active_dry_form_nested_dry_form_spec.rb
+++ b/spec/active_dry_form_nested_dry_form_spec.rb
@@ -9,20 +9,22 @@
   let(:user) { User.create!(name: 'Ivan') }
 
   context 'when form is valid' do
-    it 'creates nested model' do
-      bookmarks_attributes = [{ url: 'https://omniplatform.ru' }]
+    it 'creates nested models' do
+      bookmarks_attributes = { 0 => { url: 'https://omniplatform.ru' }, 1 => { url: 'https://google.com' } }
       personal_info_attributes = { age: 25 }
       form = NestedDryForm.new(record: user)
-      form.attributes = { bookmarks: bookmarks_attributes, personal_info: personal_info_attributes }
+      form.attributes = { 'bookmarks' => bookmarks_attributes, 'personal_info' => personal_info_attributes }
       form.update
       expect(form.valid?).to be(true)
+      expect(user.bookmarks.length).to eq(2)
       expect(user.bookmarks[0].url).to eq('https://omniplatform.ru')
+      expect(user.bookmarks[1].url).to eq('https://google.com')
       expect(user.personal_info.age).to eq 25
     end
 
     it 'updates nested model' do
       bookmark = user.bookmarks.create!(url: 'https://google.com')
-      bookmarks_attributes = [{ url: 'https://omniplatform.ru', id: bookmark.id }]
+      bookmarks_attributes = { 0 => { url: 'https://omniplatform.ru', id: bookmark.id } }
       user.build_personal_info(age: 18)
       user.personal_info.save!
       personal_info_attributes = { age: 25, id: user.personal_info.id }
@@ -36,7 +38,7 @@
 
   context 'when form is invalid' do
     it 'returns validation errors' do
-      form = NestedDryForm.new(record: user, params: { bookmarks: [{ url: '' }], personal_info: { age: 17 } })
+      form = NestedDryForm.new(record: user, params: { bookmarks: { 0 => { url: '' } }, personal_info: { age: 17 } })
       form.update
       expect(form.valid?).to be(false)
       expect(form.personal_info.errors).to eq(age: ['должно быть больше или равным 18'])
@@ -44,7 +46,7 @@
     end
 
     it 'returns validation errors nested form' do
-      form = NestedDryForm.new(params: { bookmarks: [{ url: 'http://omniplatform.ru' }] })
+      form = NestedDryForm.new(params: { bookmarks: { 0 => { url: 'http://omniplatform.ru' } } })
       form.update
       expect(form.bookmarks[0].omniplatform?).to be(true)
       expect(form.bookmarks[0].errors).to eq(url: ['url is not https'])
diff --git a/spec/active_dry_form_nested_many_spec.rb b/spec/active_dry_form_nested_many_spec.rb
index 5b7e870..e5759eb 100644
--- a/spec/active_dry_form_nested_many_spec.rb
+++ b/spec/active_dry_form_nested_many_spec.rb
@@ -10,10 +10,10 @@
   context 'when nested record is an association' do
     context 'when form is invalid' do
       it 'returns validation errors' do
-        bookmarks_attributes = [
-          { url: '', name: 'First' },
-          { url: '', name: 'Second' },
-        ]
+        bookmarks_attributes = {
+          0 => { url: '', name: 'First' },
+          1 => { url: '', name: 'Second' },
+        }
         form = NestedHasManyForm.new(record: user, params: { user: { bookmarks: bookmarks_attributes } })
         form.update
         expect(form.valid?).to be(false)
@@ -21,7 +21,7 @@
       end
 
       it 'returns typecasted value after validation' do
-        form = NestedHasManyForm.new(record: user, params: { user: { bookmarks: [{ added_on: Date.current.to_s }] } })
+        form = NestedHasManyForm.new(record: user, params: { user: { bookmarks: { 0 => { added_on: Date.current.to_s } } } })
         form.update
         expect(form.bookmarks[0].added_on).to eq Date.current
       end
@@ -42,9 +42,9 @@
 
       it 'updates nested model' do
         bookmark = user.bookmarks.create!(url: '/first')
-        bookmarks_attributes = [
-          { url: '/second', id: bookmark.id },
-        ]
+        bookmarks_attributes = {
+          0 => { url: '/second', id: bookmark.id },
+        }
         form = NestedHasManyForm.new(record: user, params: { user: { bookmarks: bookmarks_attributes } })
         expect { form.update }.not_to change(Bookmark, :count)
         expect(bookmark.url).to eq('/second')
@@ -55,10 +55,10 @@
   context 'when nested record is a hash' do
     context 'when form is invalid' do
       it 'returns validation errors' do
-        favorites_attributes = [
-          { kind: '', name: 'First' },
-          { kind: '', name: 'Second' },
-        ]
+        favorites_attributes = {
+          0 => { kind: '', name: 'First' },
+          1 => { kind: '', name: 'Second' },
+        }
         form = NestedHasManyForm.new(record: user, params: { user: { favorites: favorites_attributes } })
         form.update
         expect(form.valid?).to be(false)
@@ -69,10 +69,10 @@
     context 'when form is valid' do
       it 'creates nested model' do
         favorites_attributes =
-          [
-            { kind: 'book', name: '1984' },
-            { kind: 'movie', name: 'Planet of Monkeys' },
-          ]
+          {
+            0 => { kind: 'book', name: '1984' },
+            1 => { kind: 'movie', name: 'Planet of Monkeys' },
+          }
         form = NestedHasManyForm.new(record: user, params: { user: { favorites: favorites_attributes } })
         form.update
         expect(form.valid?).to be(true)