diff --git a/app/assets/javascripts/leaflet.share.js b/app/assets/javascripts/leaflet.share.js
index 79cb95973..db9839390 100644
--- a/app/assets/javascripts/leaflet.share.js
+++ b/app/assets/javascripts/leaflet.share.js
@@ -47,7 +47,7 @@ L.OSM.share = function (options) {
       .appendTo($linkSection);
 
     $("<div>")
-      .attr("class", "form-check form-group")
+      .attr("class", "form-check mb-3")
       .appendTo($form)
       .append(
         $("<label>")
@@ -159,7 +159,7 @@ L.OSM.share = function (options) {
       .appendTo($imageSection);
 
     $("<div>")
-      .attr("class", "form-group form-check")
+      .attr("class", "mb-3 form-check")
       .appendTo($form)
       .append(
         $("<label>")
diff --git a/app/views/accounts/edit.html.erb b/app/views/accounts/edit.html.erb
index 038f5c09f..7aad944d3 100644
--- a/app/views/accounts/edit.html.erb
+++ b/app/views/accounts/edit.html.erb
@@ -16,7 +16,7 @@
   <%= f.password_field :pass_crypt, :value => "", :autocomplete => "new-password" %>
   <%= f.password_field :pass_crypt_confirmation, :value => "", :autocomplete => "new-password" %>
 
-  <fieldset class="form-group">
+  <fieldset class="mb-3">
     <label for="user_auth_provider" class="form-label"><%= t(".external auth") %></label>
     <div class="row">
       <%= f.select(:auth_provider, Auth.providers, :hide_label => true, :wrapper => { :class => "col-auto mb-0" }) %>
@@ -25,7 +25,7 @@
     <small class="form-text text-muted">(<a href="<%= t ".openid.link" %>" target="_new"><%= t ".openid.link text" %></a>)</small>
   </fieldset>
 
-  <div class="form-group">
+  <div class="mb-3">
     <label class="form-label"><%= t ".public editing.heading" %></label>
     <span class="form-text text-muted">
       <% if current_user.data_public? %>
@@ -38,7 +38,7 @@
     </span>
   </div>
 
-  <div class="form-group">
+  <div class="mb-3">
     <label class="form-label"><%= t ".contributor terms.heading" %></label>
     <span class="form-text text-muted">
       <% if current_user.terms_agreed? %>
diff --git a/app/views/browse/changeset.html.erb b/app/views/browse/changeset.html.erb
index ca27862c8..0861ed30f 100644
--- a/app/views/browse/changeset.html.erb
+++ b/app/views/browse/changeset.html.erb
@@ -75,7 +75,7 @@
   <% if current_user %>
     <% unless @changeset.open? %>
       <form action="#" class="mb-3">
-        <div class="form-group">
+        <div class="mb-3">
           <textarea class="form-control" name="text" cols="40" rows="5"></textarea>
         </div>
         <div>
diff --git a/app/views/browse/new_note.html.erb b/app/views/browse/new_note.html.erb
index 1db7609b3..657ad9039 100644
--- a/app/views/browse/new_note.html.erb
+++ b/app/views/browse/new_note.html.erb
@@ -7,7 +7,7 @@
   <form action="#">
     <input type="hidden" name="lon" autocomplete="off">
     <input type="hidden" name="lat" autocomplete="off">
-    <div class="form-group">
+    <div class="mb-3">
       <textarea class="form-control" name="text" cols="40" rows="10" maxlength="2000" placeholder="<%= t("javascripts.notes.new.advice") %>"></textarea>
     </div>
     <div class="buttons clearfix">
diff --git a/app/views/browse/note.html.erb b/app/views/browse/note.html.erb
index 97787b178..af859651e 100644
--- a/app/views/browse/note.html.erb
+++ b/app/views/browse/note.html.erb
@@ -48,7 +48,7 @@
   <% if @note.status == "open" %>
     <% if current_user -%>
       <form action="#">
-        <div class="form-group">
+        <div class="mb-3">
           <textarea class="form-control" name="text" cols="40" rows="5" maxlength="2000"></textarea>
         </div>
         <div class="btn-wrapper">
diff --git a/app/views/issues/index.html.erb b/app/views/issues/index.html.erb
index b2b3e913a..0b9336538 100644
--- a/app/views/issues/index.html.erb
+++ b/app/views/issues/index.html.erb
@@ -6,35 +6,35 @@
 
 <%= form_tag(issues_path, :method => :get) do %>
   <div class="row gx-1">
-    <div class="form-group col-md-auto">
+    <div class="mb-3 col-md-auto">
       <%= select_tag :status,
                      options_for_select(Issue.aasm.states.map(&:name).map { |state| [t(".states.#{state}"), state] }, params[:status]),
                      :include_blank => t(".select_status"),
                      :data => { :behavior => "category_dropdown" },
                      :class => "form-select" %>
     </div>
-    <div class="form-group col-md-auto">
+    <div class="mb-3 col-md-auto">
       <%= select_tag :issue_type,
                      options_for_select(@issue_types, params[:issue_type]),
                      :include_blank => t(".select_type"),
                      :data => { :behavior => "category_dropdown" },
                      :class => "form-select" %>
     </div>
-    <div class="form-group col-md">
+    <div class="mb-3 col-md">
       <%= text_field_tag :search_by_user,
                          params[:search_by_user],
                          :placeholder => t(".reported_user"),
                          :autocomplete => "on",
                          :class => "form-control" %>
     </div>
-    <div class="form-group col-md-auto">
+    <div class="mb-3 col-md-auto">
       <%= select_tag :last_updated_by,
                      options_for_select(@users.all.collect { |f| [f.display_name, f.id] } << [t(".not_updated"), "nil"], params[:last_updated_by]),
                      :include_blank => t(".select_last_updated_by"),
                      :data => { :behavior => "category_dropdown" },
                      :class => "form-select" %>
     </div>
-    <div class="form-group col-md-auto">
+    <div class="mb-3 col-md-auto">
       <%= submit_tag t(".search"), :name => nil, :class => "btn btn-primary" %>
     </div>
   </div>
diff --git a/app/views/oauth_clients/_form.html.erb b/app/views/oauth_clients/_form.html.erb
index 455450412..e13f4110f 100644
--- a/app/views/oauth_clients/_form.html.erb
+++ b/app/views/oauth_clients/_form.html.erb
@@ -2,7 +2,7 @@
 <%= f.text_field :url %>
 <%= f.text_field :callback_url %>
 <%= f.text_field :support_url %>
-<div class='form-group'>
+<div class='mb-3'>
   <p><%= t ".requests" %></p>
   <% ClientApplication.all_permissions.each do |perm| %>
     <%= f.check_box perm %>
diff --git a/app/views/profiles/edit.html.erb b/app/views/profiles/edit.html.erb
index a6fa35220..2af64b84f 100644
--- a/app/views/profiles/edit.html.erb
+++ b/app/views/profiles/edit.html.erb
@@ -9,7 +9,7 @@
 <%= bootstrap_form_for current_user, :url => { :action => :update }, :html => { :multipart => true, :autocomplete => :off } do |f| %>
   <%= f.richtext_field :description, :cols => 80, :rows => 20 %>
 
-  <fieldset class="form-group">
+  <fieldset class="mb-3">
     <%= f.label t(".image") %>
     <div class="row">
       <div class="col-sm-2">
diff --git a/app/views/sessions/new.html.erb b/app/views/sessions/new.html.erb
index ddebc55a4..bb43aefd5 100644
--- a/app/views/sessions/new.html.erb
+++ b/app/views/sessions/new.html.erb
@@ -24,7 +24,7 @@
   <hr>
 
   <div id="loginForm">
-    <div class="form-group">
+    <div class="mb-3">
       <label class="form-label"><%= t ".with external" %></label>
 
       <ul class='list-unstyled' id="login_auth_buttons">
@@ -47,7 +47,7 @@
       </ul>
 
       <%= form_tag(auth_path(:provider => "openid"), :id => "openid_login_form") do %>
-        <div id='login_openid_url' class="form-group">
+        <div id='login_openid_url' class="mb-3">
           <label for='openid_url' class="form-label"><%= t ".openid_html", :logo => openid_logo %></label>
           <%= hidden_field_tag("referer", params[:referer], :autocomplete => "off") %>
           <%= text_field_tag("openid_url", "", :tabindex => 3, :autocomplete => "on", :class => "openid_url form-control") %>
diff --git a/app/views/site/export.html.erb b/app/views/site/export.html.erb
index b3a3bd0e9..6dd54f315 100644
--- a/app/views/site/export.html.erb
+++ b/app/views/site/export.html.erb
@@ -27,7 +27,7 @@
   </div>
 
   <div id="export_commit">
-    <div class="form-group d-flex">
+    <div class="mb-3 d-flex">
       <%= submit_tag t(".export_button"), :class => "btn btn-primary mx-auto" %>
     </div>
   </div>
diff --git a/app/views/user_blocks/revoke.html.erb b/app/views/user_blocks/revoke.html.erb
index 9ece75bb5..9a86177fc 100644
--- a/app/views/user_blocks/revoke.html.erb
+++ b/app/views/user_blocks/revoke.html.erb
@@ -16,7 +16,7 @@
   </p>
 
   <%= bootstrap_form_for :revoke, :url => { :action => "revoke" } do |f| %>
-    <div class="form-group">
+    <div class="mb-3">
       <div class="form-check">
         <%= check_box_tag "confirm", "yes", false, { :class => "form-check-input" } %>
         <%= label_tag "confirm", t(".confirm"), { :class => "form-check-label" } %>
diff --git a/app/views/users/new.html.erb b/app/views/users/new.html.erb
index c53135678..081c4a99f 100644
--- a/app/views/users/new.html.erb
+++ b/app/views/users/new.html.erb
@@ -25,7 +25,7 @@
 
       <%= f.text_field :display_name, :help => t(".display name description"), :tabindex => 3 %>
 
-      <fieldset class="form-group" id="auth_field">
+      <fieldset class="mb-3" id="auth_field">
         <label for="user_auth_provider" class="form-label"><%= t(".external auth") %></label>
         <div class="row">
           <%= f.select(:auth_provider, Auth.providers, :default => "", :hide_label => true, :wrapper => { :class => "col-auto mb-0" }, :tabindex => 4) %>
diff --git a/app/views/users/terms.html.erb b/app/views/users/terms.html.erb
index 1f42e9085..f16166702 100644
--- a/app/views/users/terms.html.erb
+++ b/app/views/users/terms.html.erb
@@ -19,7 +19,7 @@
   <label class="form-label">
     <%= t ".legale_select" %>
   </label>
-  <div class="form-group">
+  <div class="mb-3">
     <% [%w[france FR], %w[italy IT], %w[rest_of_world GB]].each do |name, legale| %>
       <div class="form-check form-check-inline">
         <%= radio_button_tag "legale", legale, @legale == legale, :data => { :url => url_for(:legale => legale) }, :class => "form-check-input" %>
@@ -41,7 +41,7 @@
             :translations => "https://www.osmfoundation.org/wiki/License/Contributor_Terms/Informal_Translations" %>
     </p>
   </div>
-  <div class="form-group">
+  <div class="mb-3">
     <div class="form-check">
       <%= check_box_tag "read_ct", "1", false, :class => "form-check-input" %>
       <label for="read_ct" class="form-check-label">
@@ -55,7 +55,7 @@
   </h4>
   <p class="text-muted"><%= t ".tou_explain_html", :tou_link => link_to(t("layouts.tou"), "https://wiki.osmfoundation.org/wiki/Terms_of_Use", :target => :new) %></p>
 
-  <div class="form-group">
+  <div class="mb-3">
     <div class="form-check">
       <%= check_box_tag "read_tou", "1", false, :class => "form-check-input" %>
       <label for="read_tou" class="form-check-label">
@@ -66,12 +66,12 @@
 
   <%= hidden_field_tag("referer", h(params[:referer])) unless params[:referer].nil? %>
 
-  <div class="form-group">
+  <div class="mb-3">
     <%= submit_tag("Continue", :name => "continue", :id => "continue", :disabled => true, :class => "btn btn-primary") %>
     <%= submit_tag("Cancel", :name => "decline", :id => "decline", :class => "btn btn-outline-secondary") %>
   </div>
 
-  <div class="form-group">
+  <div class="mb-3">
     <div class="form-check">
       <%= check_box("user", "consider_pd", :class => "form-check-input") %>
     <label for="user_consider_pd" class="form-check-label">
diff --git a/test/controllers/accounts_controller_test.rb b/test/controllers/accounts_controller_test.rb
index 173bcf22c..1e39a7329 100644
--- a/test/controllers/accounts_controller_test.rb
+++ b/test/controllers/accounts_controller_test.rb
@@ -61,7 +61,7 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
     assert_template :edit
     assert_select ".notice", false
-    assert_select "form#accountForm > div.form-group > input.is-invalid#user_display_name"
+    assert_select "form#accountForm > div > input.is-invalid#user_display_name"
 
     # Changing name to one that exists should fail, regardless of case
     new_attributes = user.attributes.dup.merge(:display_name => create(:user).display_name.upcase)
@@ -69,7 +69,7 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
     assert_template :edit
     assert_select ".notice", false
-    assert_select "form#accountForm > div.form-group > input.is-invalid#user_display_name"
+    assert_select "form#accountForm > div > input.is-invalid#user_display_name"
 
     # Changing name to one that doesn't exist should work
     new_attributes = user.attributes.dup.merge(:display_name => "new tester")
@@ -80,7 +80,7 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
     assert_template :edit
     assert_select ".notice", /^User information updated successfully/
-    assert_select "form#accountForm > div.form-group > input#user_display_name[value=?]", "new tester"
+    assert_select "form#accountForm > div > input#user_display_name[value=?]", "new tester"
 
     # Record the change of name
     user.display_name = "new tester"
@@ -95,7 +95,7 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
     assert_template :edit
     assert_select ".notice", false
-    assert_select "form#accountForm > div.form-group > input.is-invalid#user_new_email"
+    assert_select "form#accountForm > div > input.is-invalid#user_new_email"
 
     # Changing email to one that exists should fail, regardless of case
     user.new_email = create(:user).email.upcase
@@ -107,7 +107,7 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
     assert_template :edit
     assert_select ".notice", false
-    assert_select "form#accountForm > div.form-group > input.is-invalid#user_new_email"
+    assert_select "form#accountForm > div > input.is-invalid#user_new_email"
 
     # Changing email to one that doesn't exist should work
     user.new_email = "new_tester@example.com"
@@ -122,7 +122,7 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
     assert_template :edit
     assert_select ".notice", /^User information updated successfully/
-    assert_select "form#accountForm > div.form-group > input#user_new_email[value=?]", user.new_email
+    assert_select "form#accountForm > div > input#user_new_email[value=?]", user.new_email
     email = ActionMailer::Base.deliveries.first
     assert_equal 1, email.to.count
     assert_equal user.new_email, email.to.first
diff --git a/test/controllers/preferences_controller_test.rb b/test/controllers/preferences_controller_test.rb
index 8c529e62a..6bc609e6a 100644
--- a/test/controllers/preferences_controller_test.rb
+++ b/test/controllers/preferences_controller_test.rb
@@ -31,7 +31,7 @@ class PreferencesControllerTest < ActionDispatch::IntegrationTest
     assert_template :edit
     assert_select ".notice", false
     assert_select ".error", true
-    assert_select "form > div.form-group > select#user_preferred_editor > option[selected]", false
+    assert_select "form > div > select#user_preferred_editor > option[selected]", false
 
     # Changing to a valid editor should work
     user.preferred_editor = "id"
diff --git a/test/controllers/profiles_controller_test.rb b/test/controllers/profiles_controller_test.rb
index 737779455..824ecb5e3 100644
--- a/test/controllers/profiles_controller_test.rb
+++ b/test/controllers/profiles_controller_test.rb
@@ -39,7 +39,7 @@ class ProfilesControllerTest < ActionDispatch::IntegrationTest
     assert_template :show
     assert_select ".notice", /^Profile updated./
     get edit_profile_path
-    assert_select "form > fieldset.form-group > div > div.col-sm-10 > div.form-check > input[name=avatar_action][checked][value=?]", "keep"
+    assert_select "form > fieldset > div > div.col-sm-10 > div.form-check > input[name=avatar_action][checked][value=?]", "keep"
 
     # Changing to a gravatar image should work
     put profile_path, :params => { :avatar_action => "gravatar", :user => { :description => user.description } }
@@ -50,7 +50,7 @@ class ProfilesControllerTest < ActionDispatch::IntegrationTest
     assert_template :show
     assert_select ".notice", /^Profile updated./
     get edit_profile_path
-    assert_select "form > fieldset.form-group > div > div.col-sm-10 > div.form-group > div.form-check > input[name=avatar_action][checked][value=?]", "gravatar"
+    assert_select "form > fieldset > div > div.col-sm-10 > div > div.form-check > input[name=avatar_action][checked][value=?]", "gravatar"
 
     # Removing the image should work
     put profile_path, :params => { :avatar_action => "delete", :user => { :description => user.description } }
@@ -61,7 +61,7 @@ class ProfilesControllerTest < ActionDispatch::IntegrationTest
     assert_template :show
     assert_select ".notice", /^Profile updated./
     get edit_profile_path
-    assert_select "form > fieldset.form-group > div > div.col-sm-10 > div.form-check > input[name=avatar_action][checked]", false
-    assert_select "form > fieldset.form-group > div > div.col-sm-10 > div.form-group > div.form-check > input[name=avatar_action][checked]", false
+    assert_select "form > fieldset > div > div.col-sm-10 > div > input[name=avatar_action][checked]", false
+    assert_select "form > fieldset > div > div.col-sm-10 > div > div.form-check > input[name=avatar_action][checked]", false
   end
 end
diff --git a/test/controllers/users_controller_test.rb b/test/controllers/users_controller_test.rb
index 7a487780d..634b279a5 100644
--- a/test/controllers/users_controller_test.rb
+++ b/test/controllers/users_controller_test.rb
@@ -151,7 +151,7 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
 
     assert_response :success
     assert_template "new"
-    assert_select "form > div.form-group > input.is-invalid#user_email"
+    assert_select "form > div > input.is-invalid#user_email"
   end
 
   def test_save_duplicate_email
@@ -180,7 +180,7 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
 
     assert_response :success
     assert_template "new"
-    assert_select "form > div.form-group > input.is-invalid#user_email"
+    assert_select "form > div > input.is-invalid#user_email"
   end
 
   def test_save_duplicate_email_uppercase
@@ -209,7 +209,7 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
 
     assert_response :success
     assert_template "new"
-    assert_select "form > div.form-group > input.is-invalid#user_email"
+    assert_select "form > div > input.is-invalid#user_email"
   end
 
   def test_save_duplicate_name
@@ -238,7 +238,7 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
 
     assert_response :success
     assert_template "new"
-    assert_select "form > div.form-group > input.is-invalid#user_display_name"
+    assert_select "form > div > input.is-invalid#user_display_name"
   end
 
   def test_save_duplicate_name_uppercase
@@ -267,7 +267,7 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
 
     assert_response :success
     assert_template "new"
-    assert_select "form > div.form-group > input.is-invalid#user_display_name"
+    assert_select "form > div > input.is-invalid#user_display_name"
   end
 
   def test_save_blocked_domain
diff --git a/test/integration/user_creation_test.rb b/test/integration/user_creation_test.rb
index 9343487f6..7163e1b72 100644
--- a/test/integration/user_creation_test.rb
+++ b/test/integration/user_creation_test.rb
@@ -51,7 +51,7 @@ class UserCreationTest < ActionDispatch::IntegrationTest
         assert_template "users/new"
         assert_equal locale.to_s, response.headers["Content-Language"]
         assert_select "form"
-        assert_select "form > div.form-group > input.is-invalid#user_email"
+        assert_select "form > div > input.is-invalid#user_email"
         assert_no_missing_translations
       end
     end
@@ -77,7 +77,7 @@ class UserCreationTest < ActionDispatch::IntegrationTest
         end
         assert_response :success
         assert_template "users/new"
-        assert_select "form > div.form-group > input.is-invalid#user_display_name"
+        assert_select "form > div > input.is-invalid#user_display_name"
         assert_no_missing_translations
       end
     end