diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 45457a6b..0d9a6f13 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -42,13 +42,6 @@ Layout/CommentIndentation:
     - 'app/models/track.rb'
     - 'spec/features/volunteers_spec.rb'
 
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: AllowBorderComment, AllowMarginComment.
-Layout/EmptyComment:
-  Exclude:
-    - 'config/initializers/formtastic.rb'
-
 # Offense count: 3
 # Cop supports --auto-correct.
 Layout/EmptyLineAfterGuardClause:
@@ -1005,7 +998,6 @@ Style/EmptyMethod:
 Style/Encoding:
   Exclude:
     - 'app/uploaders/picture_uploader.rb'
-    - 'config/initializers/formtastic.rb'
     - 'spec/models/conference_spec.rb'
 
 # Offense count: 3
diff --git a/Gemfile b/Gemfile
index 3f9b7182..bc221407 100644
--- a/Gemfile
+++ b/Gemfile
@@ -85,8 +85,6 @@ gem 'uglifier', '>= 1.3.0'
 gem 'autoprefixer-rails'
 gem 'bootstrap-sass', '~> 3.4.0'
 gem 'cocoon'
-gem 'formtastic', '~> 3.1.5'
-gem 'formtastic-bootstrap'
 
 # as the JavaScript library
 gem 'jquery-rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index c4caaf9a..d6b86f5c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -219,10 +219,6 @@ GEM
     ffi (1.15.4)
     font-awesome-rails (4.7.0.7)
       railties (>= 3.2, < 7)
-    formtastic (3.1.5)
-      actionpack (>= 3.2.13)
-    formtastic-bootstrap (3.1.1)
-      formtastic (>= 3.0)
     geckodriver-helper (0.24.0)
       archive-zip (~> 0.7)
     globalid (0.4.2)
@@ -644,8 +640,6 @@ DEPENDENCIES
   faker
   feature
   font-awesome-rails
-  formtastic (~> 3.1.5)
-  formtastic-bootstrap
   geckodriver-helper
   gravtastic
   haml-rails
diff --git a/Gemfile.next.lock b/Gemfile.next.lock
index 4eb5fb1d..0e8acc2e 100644
--- a/Gemfile.next.lock
+++ b/Gemfile.next.lock
@@ -243,10 +243,6 @@ GEM
     ffi (1.15.3)
     font-awesome-rails (4.7.0.8)
       railties (>= 3.2, < 8.0)
-    formtastic (3.1.5)
-      actionpack (>= 3.2.13)
-    formtastic-bootstrap (3.1.1)
-      formtastic (>= 3.0)
     geckodriver-helper (0.24.0)
       archive-zip (~> 0.7)
     globalid (1.0.0)
@@ -681,8 +677,6 @@ DEPENDENCIES
   faker
   feature
   font-awesome-rails
-  formtastic (~> 3.1.5)
-  formtastic-bootstrap
   geckodriver-helper
   gravtastic
   haml-rails
diff --git a/app/assets/stylesheets/application.css b/app/assets/stylesheets/application.css
index 567fa050..3594e187 100644
--- a/app/assets/stylesheets/application.css
+++ b/app/assets/stylesheets/application.css
@@ -1,6 +1,5 @@
 /*
  *= require strap-on
- *= require formtastic-bootstrap
  *= require dataTables/bootstrap/3/jquery.dataTables.bootstrap
  *= require osem
  *= require osem-rating
diff --git a/config/initializers/formtastic.rb b/config/initializers/formtastic.rb
deleted file mode 100644
index f21da2e7..00000000
--- a/config/initializers/formtastic.rb
+++ /dev/null
@@ -1,113 +0,0 @@
-# encoding: utf-8
-
-# Set the default text field size when input is a string. Default is nil.
-# Formtastic::FormBuilder.default_text_field_size = 50
-
-# Set the default text area height when input is a text. Default is 20.
-# Formtastic::FormBuilder.default_text_area_height = 5
-
-# Set the default text area width when input is a text. Default is nil.
-# Formtastic::FormBuilder.default_text_area_width = 50
-
-# Should all fields be considered "required" by default?
-# Defaults to true.
-# Formtastic::FormBuilder.all_fields_required_by_default = true
-
-# Should select fields have a blank option/prompt by default?
-# Defaults to true.
-Formtastic::FormBuilder.include_blank_for_select_by_default = false
-
-# Set the string that will be appended to the labels/fieldsets which are required
-# It accepts string or procs and the default is a localized version of
-# '<abbr title="required">*</abbr>'. In other words, if you configure formtastic.required
-# in your locale, it will replace the abbr title properly. But if you don't want to use
-# abbr tag, you can simply give a string as below
-Formtastic::FormBuilder.required_string = proc { Formtastic::Util.html_safe(%{&nbsp;<span class="text-warning"><abbr title="This field is required">*</abbr></span>}) }
-
-# Set the string that will be appended to the labels/fieldsets which are optional
-# Defaults to an empty string ("") and also accepts procs (see required_string above)
-# Formtastic::FormBuilder.optional_string = "(optional)"
-
-# Set the way inline errors will be displayed.
-# Defaults to :sentence, valid options are :sentence, :list, :first and :none
-# Formtastic::FormBuilder.inline_errors = :sentence
-# Formtastic uses the following classes as default for hints, inline_errors and error list
-
-# If you override the class here, please ensure to override it in your stylesheets as well
-# Formtastic::FormBuilder.default_hint_class = "inline-hints"
-# Formtastic::FormBuilder.default_inline_error_class = "inline-errors"
-# Formtastic::FormBuilder.default_error_list_class = "errors"
-
-# Set the method to call on label text to transform or format it for human-friendly
-# reading when formtastic is used without object. Defaults to :humanize.
-# Formtastic::FormBuilder.label_str_method = :humanize
-
-# Set the array of methods to try calling on parent objects in :select and :radio inputs
-# for the text inside each @<option>@ tag or alongside each radio @<input>@. The first method
-# that is found on the object will be used.
-# Defaults to ["to_label", "display_name", "full_name", "name", "title", "username", "login", "value", "to_s"]
-# Formtastic::FormBuilder.collection_label_methods = [
-#   "to_label", "display_name", "full_name", "name", "title", "username", "login", "value", "to_s"]
-
-# Specifies if labels/hints for input fields automatically be looked up using I18n.
-# Default value: true. Overridden for specific fields by setting value to true,
-# i.e. :label => true, or :hint => true (or opposite depending on initialized value)
-# Formtastic::FormBuilder.i18n_lookups_by_default = false
-
-# Specifies if I18n lookups of the default I18n Localizer should be cached to improve performance.
-# Defaults to true.
-# Formtastic::FormBuilder.i18n_cache_lookups = false
-
-# Specifies the class to use for localization lookups. You can create your own
-# class and use it instead by subclassing Formtastic::Localizer (which is the default).
-# Formtastic::FormBuilder.i18n_localizer = MyOwnLocalizer
-
-# You can add custom inputs or override parts of Formtastic by subclassing Formtastic::FormBuilder and
-# specifying that class here.  Defaults to Formtastic::FormBuilder.
-# Formtastic::Helpers::FormHelper.builder = MyCustomBuilder
-
-# All formtastic forms have a class that indicates that they are just that. You
-# can change it to any class you want.
-# Formtastic::Helpers::FormHelper.default_form_class = 'formtastic'
-
-# Formtastic will infer a class name from the model, array, string ot symbol you pass to the
-# form builder. You can customize the way that class is presented by overriding
-# this proc.
-# Formtastic::Helpers::FormHelper.default_form_model_class_proc = proc { |model_class_name| model_class_name }
-
-# Allows to set a custom field_error_proc wrapper. By default this wrapper
-# is disabled since `formtastic` already adds an error class to the LI tag
-# containing the input.
-# Formtastic::Helpers::FormHelper.formtastic_field_error_proc = proc { |html_tag, instance_tag| html_tag }
-
-# You can opt-in to Formtastic's use of the HTML5 `required` attribute on `<input>`, `<select>`
-# and `<textarea>` tags by setting this to true (defaults to false).
-# Formtastic::FormBuilder.use_required_attribute = false
-
-# You can opt-in to new HTML5 browser validations (for things like email and url inputs) by setting
-# this to true. Doing so will add a `novalidate` attribute to the `<form>` tag.
-# See http://diveintohtml5.org/forms.html#validation for more info.
-Formtastic::FormBuilder.perform_browser_validations = true
-#
-Formtastic::Helpers::FormHelper.builder = FormtasticBootstrap::FormBuilder
-FormtasticBootstrap::FormBuilder.default_inline_hint_class = FormtasticBootstrap::FormBuilder.default_block_hint_class
-
-# By creating custom input class finder, you can change how input classes  are looked up.
-# For example you can make it to search for TextInputFilter instead of TextInput.
-# See # TODO: add link # for more information
-# NOTE: this behavior will be default from Formtastic 4.0
-Formtastic::FormBuilder.input_class_finder = Formtastic::InputClassFinder
-
-# Define custom namespaces in which to look up your Input classes. Default is
-# to look up in the global scope and in Formtastic::Inputs.
-# Formtastic::FormBuilder.input_namespaces = [ ::Object, ::MyInputsModule, ::Formtastic::Inputs ]
-
-# By creating custom action class finder, you can change how action classes are looked up.
-# For example you can make it to search for MyButtonAction instead of ButtonAction.
-# See # TODO: add link # for more information
-# NOTE: this behavior will be default from Formtastic 4.0
-Formtastic::FormBuilder.action_class_finder = Formtastic::ActionClassFinder
-
-# Define custom namespaces in which to look up your Action classes. Default is
-# to look up in the global scope and in Formtastic::Actions.
-# Formtastic::FormBuilder.action_namespaces = [ ::Object, ::MyActionsModule, ::Formtastic::Actions ]