diff --git a/django_select2/conf.py b/django_select2/conf.py
index 090bae80..76376b4c 100644
--- a/django_select2/conf.py
+++ b/django_select2/conf.py
@@ -8,6 +8,9 @@
 class Select2Conf(AppConf):
     """Settings for Django-Select2."""
 
+    LIB_VERSION = '4.0.3'
+    """Version of the Select2 library."""
+
     CACHE_BACKEND = 'default'
     """
     Django-Select2 uses Django's cache to sure a consistent state across multiple machines.
@@ -53,7 +56,7 @@ class Select2Conf(AppConf):
     It has set `select2_` as a default value, which you can change if needed.
     """
 
-    JS = '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js'
+    JS = f'//cdnjs.cloudflare.com/ajax/libs/select2/{LIB_VERSION}/js/select2.min.js'
     """
     The URI for the Select2 JS file. By default this points to the Cloudflare CDN.
 
@@ -71,7 +74,7 @@ class Select2Conf(AppConf):
         develop without an Internet connection.
     """
 
-    CSS = '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css'
+    CSS = f'//cdnjs.cloudflare.com/ajax/libs/select2/{LIB_VERSION}/css/select2.min.css'
     """
     The URI for the Select2 CSS file. By default this points to the Cloudflare CDN.
 
@@ -89,7 +92,7 @@ class Select2Conf(AppConf):
         develop without an Internet connection.
     """
 
-    I18N_PATH = '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/i18n'
+    I18N_PATH = f'//cdnjs.cloudflare.com/ajax/libs/select2/{LIB_VERSION}/js/i18n'
     """
     The base URI for the Select2 i18n files. By default this points to the Cloudflare CDN.
 
diff --git a/tests/test_forms.py b/tests/test_forms.py
index d871e442..22ec60d1 100644
--- a/tests/test_forms.py
+++ b/tests/test_forms.py
@@ -14,6 +14,7 @@
 from selenium.webdriver.support.wait import WebDriverWait
 
 from django_select2.cache import cache
+from django_select2.conf import settings
 from django_select2.forms import (
     HeavySelect2MultipleWidget, HeavySelect2Widget, ModelSelect2TagWidget,
     ModelSelect2Widget, Select2Widget
@@ -104,28 +105,28 @@ def test_empty_option(self, db):
     def test_i18n(self):
         translation.activate('de')
         assert tuple(Select2Widget().media._js) == (
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js',
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/i18n/de.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/de.js',
             'django_select2/django_select2.js'
         )
 
         translation.activate('en')
         assert tuple(Select2Widget().media._js) == (
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js',
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/i18n/en.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/en.js',
             'django_select2/django_select2.js'
         )
 
         translation.activate('00')
         assert tuple(Select2Widget().media._js) == (
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
             'django_select2/django_select2.js'
         )
 
         translation.activate('sr-cyrl')
         assert tuple(Select2Widget().media._js) == (
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js',
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/i18n/sr-Cyrl.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/sr-Cyrl.js',
             'django_select2/django_select2.js'
         )
 
@@ -133,15 +134,15 @@ def test_i18n(self):
 
         translation.activate('zh-hans')
         assert tuple(Select2Widget().media._js) == (
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js',
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/i18n/zh-CN.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/zh-CN.js',
             'django_select2/django_select2.js'
         )
 
         translation.activate('zh-hant')
         assert tuple(Select2Widget().media._js) == (
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js',
-            '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/i18n/zh-TW.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/zh-TW.js',
             'django_select2/django_select2.js'
         )
 
@@ -150,8 +151,8 @@ class TestSelect2MixinSettings(object):
     def test_default_media(self):
         sut = Select2Widget()
         result = sut.media.render()
-        assert '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js' in result
-        assert '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css' in result
+        assert f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js' in result
+        assert f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/css/select2.min.css' in result
         assert 'django_select2/django_select2.js' in result
 
     def test_js_setting(self, settings):