diff --git a/CHANGES.rst b/CHANGES.rst
index 9e02600..2a3b17c 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,7 @@
 Changelog
 =========
 
+- Fixed typo in Bootstrap in code and CHANGES.rst.
 - Upgrade to Bootstrap Icons 1.11.3.
 
 
@@ -67,7 +68,7 @@ Release date: 2022/11/20
 
 - Drop Python 3.6 support, and test against Python 3.10.
 - Add support for strict Content Security Policy (CSP) (`#252 <https://github.com/helloflask/bootstrap-flask/pull/252>`__)
-- Upgrade to Bootstrap 5.2.2, Popper 2.11.6, Bootswatch 5.2.2, and Boostrap Icons 1.9.1.
+- Upgrade to Bootstrap 5.2.2, Popper 2.11.6, Bootswatch 5.2.2, and Bootstrap Icons 1.9.1.
 - Fix Flask-SQLAlchemy ``paginate`` named parameters in tests and examples.
 - Support to preview available Bootswatch theme in the example application.
 - Remove ``.DS_Store`` files from the distribution files.
diff --git a/flask_bootstrap/__init__.py b/flask_bootstrap/__init__.py
index 3aaec82..c711908 100644
--- a/flask_bootstrap/__init__.py
+++ b/flask_bootstrap/__init__.py
@@ -108,18 +108,18 @@ def load_css(self, version=None, bootstrap_sri=None, bootswatch_theme=None):
                 base_path = 'css'
             else:
                 base_path = f'css/bootswatch/{bootswatch_theme.lower()}'
-            boostrap_url = url_for('bootstrap.static', filename=f'{base_path}/{self.bootstrap_css_filename}')
+            bootstrap_url = url_for('bootstrap.static', filename=f'{base_path}/{self.bootstrap_css_filename}')
         else:
             if not bootswatch_theme:
                 base_path = f'{CDN_BASE}/bootstrap@{version}/dist/css'
             else:
                 base_path = f'{CDN_BASE}/bootswatch@{version}/dist/{bootswatch_theme.lower()}'
-            boostrap_url = f'{base_path}/{self.bootstrap_css_filename}'
+            bootstrap_url = f'{base_path}/{self.bootstrap_css_filename}'
 
         if bootstrap_sri and not bootswatch_theme:
-            css = f'<link rel="stylesheet" href="{boostrap_url}" integrity="{bootstrap_sri}" crossorigin="anonymous">'
+            css = f'<link rel="stylesheet" href="{bootstrap_url}" integrity="{bootstrap_sri}" crossorigin="anonymous">'
         else:
-            css = f'<link rel="stylesheet" href="{boostrap_url}">'
+            css = f'<link rel="stylesheet" href="{bootstrap_url}">'
         return Markup(css)
 
     def _get_js_script(self, version, name, sri, nonce):