diff --git a/crispy_forms_bootstrap2/templates/bootstrap/accordion-group.html b/crispy_forms_bootstrap2/templates/bootstrap/accordion-group.html
index 2a42618..e77e64d 100644
--- a/crispy_forms_bootstrap2/templates/bootstrap/accordion-group.html
+++ b/crispy_forms_bootstrap2/templates/bootstrap/accordion-group.html
@@ -1,4 +1,4 @@
-<div class="accordion-group">
+<div class="accordion-group{% if div.css_class %} {{ div.css_class }}{% endif %}">
     <div class="accordion-heading">
         <a class="accordion-toggle" data-toggle="collapse" data-parent="#{{ div.data_parent }}" href="#{{ div.css_id }}">{{ div.name }}</a>
     </div>
diff --git a/crispy_forms_bootstrap2/templates/bootstrap/accordion.html b/crispy_forms_bootstrap2/templates/bootstrap/accordion.html
index 9a589e5..a934cf7 100644
--- a/crispy_forms_bootstrap2/templates/bootstrap/accordion.html
+++ b/crispy_forms_bootstrap2/templates/bootstrap/accordion.html
@@ -1,3 +1,3 @@
-<div class="accordion" id="{{ accordion.css_id }}">
+<div class="accordion{% if accordion.css_class %} {{ accordion.css_class }}{% endif %}" id="{{ accordion.css_id }}">
     {{ content|safe }}
 </div>
diff --git a/requirements.txt b/requirements.txt
index 66411d7..b0b704d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ pytest
 pytest-cov
 pytest-django
 django
-django-crispy-forms
+django-crispy-forms>=2.3
diff --git a/setup.py b/setup.py
index 45991e4..af7cfa2 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
     url="https://github.com/django-crispy-forms/crispy-forms-bootstrap2",
     license="MIT",
     description="Django-crispy-forms bootstrap2 templates",
-    install_requires=["django-crispy-forms >= 1.8"],
+    install_requires=["django-crispy-forms >= 2.3"],
     classifiers=[
         "Programming Language :: Python :: 3",
         "License :: OSI Approved :: MIT License",
diff --git a/tests/test_layout_objects.py b/tests/test_layout_objects.py
index 79a045f..9b03a8c 100644
--- a/tests/test_layout_objects.py
+++ b/tests/test_layout_objects.py
@@ -283,6 +283,39 @@ def test_accordion_and_accordiongroup(self, settings):
         assert html.count('name="password1"') == 1
         assert html.count('name="password2"') == 1
 
+    def test_accordion_css_class_is_applied(self):
+        classes = "one two three"
+        test_form = SampleForm()
+        test_form.helper = FormHelper()
+        test_form.helper.form_tag = False
+        test_form.helper.layout = Layout(
+            Accordion(
+                AccordionGroup("one", "first_name"),
+                css_class=classes,
+                css_id="super-accordion",
+            )
+        )
+        html = render_crispy_form(test_form)
+
+        assert (
+            html.count('<div class="accordion %s" id="super-accordion"' % classes) == 1
+        )
+
+    def test_accordion_group_css_class_is_applied(self):
+        classes = "one two three"
+        test_form = SampleForm()
+        test_form.helper = FormHelper()
+        test_form.helper.form_tag = False
+        test_form.helper.layout = Layout(
+            Accordion(
+                AccordionGroup("one", "first_name", css_class=classes),
+                AccordionGroup("two", "password1", "password2"),
+            )
+        )
+        html = render_crispy_form(test_form)
+
+        assert html.count('<div class="accordion-group %s"' % classes) == 1
+
     def test_accordion_active_false_not_rendered(self, settings):
         test_form = SampleForm()
         test_form.helper = FormHelper()