diff --git a/django_select2/conf.py b/django_select2/conf.py
index 0afab20c..2b62e096 100644
--- a/django_select2/conf.py
+++ b/django_select2/conf.py
@@ -56,7 +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/{version}/js/select2.min.js'.format(version=LIB_VERSION)
+    JS = 'https://cdnjs.cloudflare.com/ajax/libs/select2/{version}/js/select2.min.js'.format(version=LIB_VERSION)
     """
     The URI for the Select2 JS file. By default this points to the Cloudflare CDN.
 
@@ -74,7 +74,7 @@ class Select2Conf(AppConf):
         develop without an Internet connection.
     """
 
-    CSS = '//cdnjs.cloudflare.com/ajax/libs/select2/{version}/css/select2.min.css'.format(version=LIB_VERSION)
+    CSS = 'https://cdnjs.cloudflare.com/ajax/libs/select2/{version}/css/select2.min.css'.format(version=LIB_VERSION)
     """
     The URI for the Select2 CSS file. By default this points to the Cloudflare CDN.
 
@@ -92,7 +92,7 @@ class Select2Conf(AppConf):
         develop without an Internet connection.
     """
 
-    I18N_PATH = '//cdnjs.cloudflare.com/ajax/libs/select2/{version}/js/i18n'.format(version=LIB_VERSION)
+    I18N_PATH = 'https://cdnjs.cloudflare.com/ajax/libs/select2/{version}/js/i18n'.format(version=LIB_VERSION)
     """
     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 f994ae43..9671cb23 100644
--- a/tests/test_forms.py
+++ b/tests/test_forms.py
@@ -102,28 +102,28 @@ def test_empty_option(self, db):
     def test_i18n(self):
         translation.activate('de')
         assert tuple(Select2Widget().media._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',
+            f'https://cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'https://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) == (
-            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',
+            f'https://cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'https://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) == (
-            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'https://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) == (
-            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',
+            f'https://cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'https://cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/sr-Cyrl.js',
             'django_select2/django_select2.js'
         )
 
@@ -131,15 +131,15 @@ def test_i18n(self):
 
         translation.activate('zh-hans')
         assert tuple(Select2Widget().media._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',
+            f'https://cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'https://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) == (
-            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',
+            f'https://cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'https://cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/zh-TW.js',
             'django_select2/django_select2.js'
         )
 
@@ -148,8 +148,8 @@ class TestSelect2MixinSettings:
     def test_default_media(self):
         sut = Select2Widget()
         result = sut.media.render()
-        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 f'https://cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js' in result
+        assert f'https://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):
diff --git a/tests/testapp/templates/form.html b/tests/testapp/templates/form.html
index c57d0cf2..7499bc8e 100644
--- a/tests/testapp/templates/form.html
+++ b/tests/testapp/templates/form.html
@@ -15,7 +15,7 @@
   {{ form }}
   <input type="submit" value="Submit Form"/>
 </form>
-<script src="//code.jquery.com/jquery-2.1.4.min.js"></script>
+<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
 <script type="text/javascript">
   window.onerror = function (msg) {
     $("body").attr("JSError", msg);