diff --git a/freezeyt.yaml b/freezeyt.yaml
index e1e1d67e..9141c1d4 100644
--- a/freezeyt.yaml
+++ b/freezeyt.yaml
@@ -8,7 +8,6 @@ extra_pages:
   - /praha-ntk/
 url_finders:
     text/html: pyladies_cz:get_html_links
-    text/css: pyladies_cz:get_css_links
 extra_files:
   CNAME: pyladies.cz
   googlecc704f0f191eda8f.html:
@@ -17,3 +16,5 @@ extra_files:
     copy_from: original/course.html
   static:
     copy_from: static/
+status_handlers:
+    "308": "save"  # Permanent redirect
diff --git a/pyladies_cz.py b/pyladies_cz.py
index 47263f42..c2eee9d0 100755
--- a/pyladies_cz.py
+++ b/pyladies_cz.py
@@ -3,10 +3,6 @@
 """Create or serve the pyladies.cz website
 """
 
-import sys
-if sys.version_info < (3, 0):
-    raise RuntimeError('You need Python 3.')
-
 import os
 import fnmatch
 import datetime
@@ -16,6 +12,7 @@
 import argparse
 
 from flask import Flask, render_template, url_for, send_from_directory, abort
+from flask import make_response
 
 import yaml
 import markdown
@@ -25,7 +22,7 @@
 
 app = Flask('pyladies_cz')
 app.config['TEMPLATES_AUTO_RELOAD'] = True
-app.config['TRAP_HTTP_EXCEPTIONS'] = True
+app.config['PROPAGATE_EXCEPTIONS'] = True
 
 orig_path = os.path.join(app.root_path, 'original/')
 v1_path = os.path.join(orig_path, 'v1/')
@@ -38,13 +35,12 @@ def redirect(url):
     """Return a response with a Meta redirect"""
 
     # With static pages, we can't use HTTP redirects.
-    # Return a page wit <meta refresh> instead.
-    #
-    # When Frozen-Flask gets support for redirects
-    # (https://github.com/Frozen-Flask/Frozen-Flask/issues/81),
-    # this should be revisited.
+    # Return a page with <meta refresh> instead.
 
-    return render_template('meta_redirect.html', url=url)
+    rendered_template = render_template('meta_redirect.html', url=url)
+    response = make_response(rendered_template, 308)  # 308 Permanent redirect
+    response.headers['Location'] = url
+    return response
 
 
 ########
@@ -125,7 +121,11 @@ def v1(path=''):
         path += 'index.html'
     if path in REDIRECTS:
         return redirect(REDIRECTS[path])
-    return send_from_directory(v1_path, path)
+    response = send_from_directory(v1_path, path)
+    if path.startswith(('css/bootstrap.css', 'reveal.js')):
+        # Bootstrap and Reveal contain some URLs to documents we do not serve.
+        response.headers['Freezeyt-URL-Finder'] = 'none'
+    return response
 
 @app.route('/course.html')
 def course_html():
@@ -360,9 +360,6 @@ def info_redirect(app):
             yield url_for('info_redirect', city=city)
 
 def get_html_links(page_content, base_url, headers):
-    from urllib.parse import urlparse
-    if urlparse(base_url).path.startswith('/v1/reveal.js'):
-        return
     import freezeyt.url_finders
     for link in freezeyt.url_finders.get_html_links(
         page_content, base_url, headers,
@@ -370,14 +367,6 @@ def get_html_links(page_content, base_url, headers):
         if not link.startswith('../components/bootstrap/fonts/glyphicons-halflings-regular.'):
             yield link
 
-def get_css_links(page_content, base_url, headers):
-    from urllib.parse import urlparse
-    if urlparse(base_url).path.startswith('/v1/css/bootstrap.css'):
-        return ()
-    import freezeyt.url_finders
-    return freezeyt.url_finders.get_css_links(
-        page_content, base_url, headers)
-
 def serve(host, port):
     app.run(host=host, port=port, debug=True)
 
diff --git a/requirements.txt b/requirements.txt
index c6a6a223..fb67bd3f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 PyYAML
 Flask
-freezeyt==1.2.0
+freezeyt==2.0.0
 markdown
 markupsafe
 werkzeug<3