diff --git a/requirements/tests.in b/requirements/tests.in
index e2b0472..0edb740 100644
--- a/requirements/tests.in
+++ b/requirements/tests.in
@@ -2,3 +2,4 @@ pytest
 pytest-cov
 flask-wtf
 flask-sqlalchemy
+beautifulsoup4
diff --git a/requirements/tests.txt b/requirements/tests.txt
index 2838994..b863001 100644
--- a/requirements/tests.txt
+++ b/requirements/tests.txt
@@ -1,10 +1,12 @@
-# SHA1:2bce3613bf781b5318773bbd23ef6330092309f9
+# SHA1:34838a637a8bb69340f90a1de71e46b007e4a5d6
 #
 # This file is autogenerated by pip-compile-multi
 # To update, run:
 #
 #    pip-compile-multi
 #
+beautifulsoup4==4.13.4
+    # via -r requirements/tests.in
 blinker==1.8.2
     # via flask
 click==8.1.8
@@ -50,12 +52,16 @@ pytest-cov==5.0.0
     # via -r requirements/tests.in
 sqlalchemy==2.0.38
     # via flask-sqlalchemy
+soupsieve==2.7
+    # via beautifulsoup4
 tomli==2.2.1
     # via
     #   coverage
     #   pytest
 typing-extensions==4.12.2
-    # via sqlalchemy
+    # via
+    #   beautifulsoup4
+    #   sqlalchemy
 werkzeug==3.0.6
     # via flask
 wtforms==3.1.2
diff --git a/tests/test_bootstrap5/test_integrity.py b/tests/test_bootstrap5/test_integrity.py
new file mode 100644
index 0000000..dce9ee3
--- /dev/null
+++ b/tests/test_bootstrap5/test_integrity.py
@@ -0,0 +1,32 @@
+import pytest
+from bs4 import BeautifulSoup
+from flask import Flask, render_template_string
+
+
+@pytest.fixture
+def app():
+    app = Flask(__name__)
+    app.secret_key = "test"
+    return app
+
+
+def test_cdn_integrity(app):
+    @app.route("/")
+    def index():
+        return render_template_string(
+            "{{ bootstrap.load_css() }}{{ bootstrap.load_js() }}"
+        )
+
+    client = app.test_client()
+    response = client.get("/")
+    html = response.get_data(as_text=True)
+    soup = BeautifulSoup(html, "html.parser")
+
+    css = soup.find("link", rel="stylesheet")
+    js = soup.find("script", src=lambda s: s and "bootstrap" in s)
+
+    bootstrap = app.extensions["bootstrap"]
+    assert css["integrity"] == bootstrap.bootstrap_css_integrity
+    assert js["integrity"] == bootstrap.bootstrap_js_integrity
+    assert css["crossorigin"] == "anonymous"
+    assert js["crossorigin"] == "anonymous"