diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 193ec92..3703405 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -18,7 +18,7 @@ jobs:
         tox_env: ${{ matrix.tox_env }}
     strategy:
       matrix:
-        tox_env: [py38, py39, py310, py311, py312]
+        tox_env: [py311, py312, py313, py314]
 
     # Use GitHub's Linux Docker host
     runs-on: ubuntu-latest
diff --git a/README.md b/README.md
index e4ac771..0f7cd85 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,13 @@ licensed under the same license.
 
 ## Changelog
 
+### naucse_render 2.1
+
+* Update to mistune 3.3. This changes parsing & formatting for Markdown again.
+  In most cases the differences should be superficial.
+
+* Tested with Python 3.11-3.15
+
 ### naucse_render 2.0
 
 * Update to mistune 3.x & nbconvert 7.x. This changes parsing & formatting
diff --git a/naucse_render/markdown.py b/naucse_render/markdown.py
index 0abb534..b5dc026 100644
--- a/naucse_render/markdown.py
+++ b/naucse_render/markdown.py
@@ -25,12 +25,13 @@ def naucse_admonition_plugin(md):
     # out how to write a plugin")
 
     ADMONITION_NAME_PATTERN = re.compile(r' *\[(\S+)\]([^\n]*)\n')
-
     def parse_naucse_admonition(block, m, state):
+        text, end_pos, lazy_line_starts = block.extract_block_quote(m, state)
 
-        text, end_pos = block.extract_block_quote(m, state)
         name_match = ADMONITION_NAME_PATTERN.match(text)
-        if name_match:
+
+        depth = state.depth()
+        if not depth and name_match:
             # It's an admonition
             token = {
                 'type': 'naucse_admonition',
@@ -45,8 +46,14 @@ def parse_naucse_admonition(block, m, state):
                 'type': 'block_quote',
             }
 
-        child = state.child_state(text)
-        rules = block.block_quote_rules
+        # scan children state
+        child = state.child_state(text, lazy_line_starts=lazy_line_starts)
+        if state.depth() >= block.max_nested_level - 1:
+            rules = list(block.block_quote_rules)
+            rules.remove("block_quote")
+        else:
+            rules = block.block_quote_rules
+
         block.parse(child, rules)
         token['children'] = child.tokens
         if end_pos:
@@ -132,9 +139,20 @@ def text_to_id(text):
 class NaucseRenderer(mistune.HTMLRenderer):
     code_tmpl = '<div class="highlight"><pre><code>{}</code></pre></div>'
 
-    def __init__(self, convert_url, *args, escape=False, **kwargs):
+    def __init__(
+        self,
+        convert_url,
+        *args,
+        **kwargs,
+    ):
         self._convert_url = convert_url
-        super().__init__(*args, **kwargs, escape=False)
+        super().__init__(
+            *args, **kwargs,
+            # We check the resulting HTML, so we don't sanitization
+            # in the Markdown->HTML translation
+            escape=False,
+            allow_harmful_protocols=True,
+        )
 
     def naucse_admonition(self, text, title, name):
         if title:
diff --git a/pyproject.toml b/pyproject.toml
index 53dfcca..631e480 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,14 +7,14 @@ name = "naucse_render"
 version = '2.0'
 description = 'Converts course material to naucse.python.cz API'
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.11"
 classifiers = [
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
 ]
 dependencies = [
     'ansi2html',
-    'mistune>=2.0.3,<4',
+    'mistune>=3.3.0,<4',
     'nbconvert>=7.0,<8.0',
     'traitlets',
     'click',
diff --git a/test_naucse_render/fixtures/expected-compiled/default/install-editor/index.html b/test_naucse_render/fixtures/expected-compiled/default/install-editor/index.html
index eb28f9a..6351001 100644
--- a/test_naucse_render/fixtures/expected-compiled/default/install-editor/index.html
+++ b/test_naucse_render/fixtures/expected-compiled/default/install-editor/index.html
@@ -14,7 +14,7 @@ <h2 id="co_programatorsky_editor_umi">Co programátorský editor umí
 <p>...</p>
 <div class="admonition note"><p>Pro ilustraci, takhle může v editoru vypadat kousek kódu:</p>
 <div class="highlight"><pre><span></span>    <span class="mi">1</span>  <span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">&#39;/courses/&lt;course:course&gt;/&#39;</span><span class="p">)</span>
-    <span class="mi">2</span>  <span class="k">def</span> <span class="nf">course_page</span><span class="p">(</span><span class="n">course</span><span class="p">):</span>
+    <span class="mi">2</span>  <span class="k">def</span><span class="w"> </span><span class="nf">course_page</span><span class="p">(</span><span class="n">course</span><span class="p">):</span>
     <span class="mi">3</span>      <span class="o">...</span>
 </pre></div></div><h2 id="volba_a_nastaveni_editoru">Volba a nastavení editoru
 <a href="#volba_a_nastaveni_editoru" class="header-link">#</a>
diff --git a/test_naucse_render/fixtures/expected-compiled/lessons/install-editor/index.html b/test_naucse_render/fixtures/expected-compiled/lessons/install-editor/index.html
index eb28f9a..6351001 100644
--- a/test_naucse_render/fixtures/expected-compiled/lessons/install-editor/index.html
+++ b/test_naucse_render/fixtures/expected-compiled/lessons/install-editor/index.html
@@ -14,7 +14,7 @@ <h2 id="co_programatorsky_editor_umi">Co programátorský editor umí
 <p>...</p>
 <div class="admonition note"><p>Pro ilustraci, takhle může v editoru vypadat kousek kódu:</p>
 <div class="highlight"><pre><span></span>    <span class="mi">1</span>  <span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">&#39;/courses/&lt;course:course&gt;/&#39;</span><span class="p">)</span>
-    <span class="mi">2</span>  <span class="k">def</span> <span class="nf">course_page</span><span class="p">(</span><span class="n">course</span><span class="p">):</span>
+    <span class="mi">2</span>  <span class="k">def</span><span class="w"> </span><span class="nf">course_page</span><span class="p">(</span><span class="n">course</span><span class="p">):</span>
     <span class="mi">3</span>      <span class="o">...</span>
 </pre></div></div><h2 id="volba_a_nastaveni_editoru">Volba a nastavení editoru
 <a href="#volba_a_nastaveni_editoru" class="header-link">#</a>
diff --git a/test_naucse_render/fixtures/expected-compiled/lessons/test_subpages/index.html b/test_naucse_render/fixtures/expected-compiled/lessons/test_subpages/index.html
index f305c88..1c31e54 100644
--- a/test_naucse_render/fixtures/expected-compiled/lessons/test_subpages/index.html
+++ b/test_naucse_render/fixtures/expected-compiled/lessons/test_subpages/index.html
@@ -1 +1 @@
-<p>This is the main page with links to subpages <a href="naucse:page?lesson=testcases/test_subpages&page=titled">one</a>, <a href="naucse:page?lesson=testcases/test_subpages&page=subtitled">two</a> and <a href="naucse:page?lesson=testcases/test_subpages&page=both-titles">three</a>.</p>
\ No newline at end of file
+<p>This is the main page with links to subpages <a href="naucse:page?lesson=testcases/test_subpages&amp;page=titled">one</a>, <a href="naucse:page?lesson=testcases/test_subpages&amp;page=subtitled">two</a> and <a href="naucse:page?lesson=testcases/test_subpages&amp;page=both-titles">three</a>.</p>
\ No newline at end of file
diff --git a/test_naucse_render/fixtures/expected-dumps/beginners/install-editor.yaml b/test_naucse_render/fixtures/expected-dumps/beginners/install-editor.yaml
index 2a2be7c..abbc023 100644
--- a/test_naucse_render/fixtures/expected-dumps/beginners/install-editor.yaml
+++ b/test_naucse_render/fixtures/expected-dumps/beginners/install-editor.yaml
@@ -98,13 +98,13 @@ data:
                     nd\">@app</span><span class=\"o\">.</span><span class=\"n\">route</span><span\
                     \ class=\"p\">(</span><span class=\"s1\">&#39;/courses/&lt;course:course&gt;/&#39;</span><span\
                     \ class=\"p\">)</span>\n    <span class=\"mi\">2</span>  <span\
-                    \ class=\"k\">def</span> <span class=\"nf\">course_page</span><span\
-                    \ class=\"p\">(</span><span class=\"n\">course</span><span class=\"\
-                    p\">):</span>\n    <span class=\"mi\">3</span>      <span class=\"\
-                    o\">...</span>\n</pre></div></div><h2 id=\"volba_a_nastaveni_editoru\"\
-                    >Volba a nastaven\xED editoru\n<a href=\"#volba_a_nastaveni_editoru\"\
-                    \ class=\"header-link\">#</a>\n</h2>\n<p>...</p>\n<ul>\n<li><a\
-                    \ href=\"naucse:page?lesson=beginners/install-editor&amp;page=atom\"\
+                    \ class=\"k\">def</span><span class=\"w\"> </span><span class=\"\
+                    nf\">course_page</span><span class=\"p\">(</span><span class=\"\
+                    n\">course</span><span class=\"p\">):</span>\n    <span class=\"\
+                    mi\">3</span>      <span class=\"o\">...</span>\n</pre></div></div><h2\
+                    \ id=\"volba_a_nastaveni_editoru\">Volba a nastaven\xED editoru\n\
+                    <a href=\"#volba_a_nastaveni_editoru\" class=\"header-link\">#</a>\n\
+                    </h2>\n<p>...</p>\n<ul>\n<li><a href=\"naucse:page?lesson=beginners/install-editor&amp;page=atom\"\
                     >Atom</a> \u2013 doporu\u010Den\xFD editor pro\nWindows a macOS.</li>\n\
                     </ul>\n<p>...</p>\n<ul>\n<li><a href=\"naucse:page?lesson=beginners/install-editor&amp;page=gedit\"\
                     >Gedit</a> \u2013 b\xFDv\xE1 na syst\xE9mech s\_prost\u0159ed\xED\
diff --git a/test_naucse_render/fixtures/expected-dumps/testcases/test_subpages.yaml b/test_naucse_render/fixtures/expected-dumps/testcases/test_subpages.yaml
index 337ab2e..518aa88 100644
--- a/test_naucse_render/fixtures/expected-dumps/testcases/test_subpages.yaml
+++ b/test_naucse_render/fixtures/expected-dumps/testcases/test_subpages.yaml
@@ -20,9 +20,9 @@ data:
             index:
                 attribution:
                 - Petr Viktorin
-                content: <p>This is the main page with links to subpages <a href="naucse:page?lesson=testcases/test_subpages&page=titled">one</a>,
-                    <a href="naucse:page?lesson=testcases/test_subpages&page=subtitled">two</a>
-                    and <a href="naucse:page?lesson=testcases/test_subpages&page=both-titles">three</a>.</p>
+                content: <p>This is the main page with links to subpages <a href="naucse:page?lesson=testcases/test_subpages&amp;page=titled">one</a>,
+                    <a href="naucse:page?lesson=testcases/test_subpages&amp;page=subtitled">two</a>
+                    and <a href="naucse:page?lesson=testcases/test_subpages&amp;page=both-titles">three</a>.</p>
                 ids: []
                 license: cc0
                 links:
diff --git a/test_naucse_render/test_markdown.py b/test_naucse_render/test_markdown.py
index 787cf94..c8a68ab 100644
--- a/test_naucse_render/test_markdown.py
+++ b/test_naucse_render/test_markdown.py
@@ -226,8 +226,8 @@ def test_convert_with_prompt_spaces_pycon():
     """)
     expected = dedent("""
         <div class="highlight"><pre><span></span>
-        <span class="gp">&gt;&gt;&gt; </span><span class="k">def</span>
-         <span class="nf">foo</span><span class="p">(</span>
+        <span class="gp">&gt;&gt;&gt; </span><span class="k">def</span><span class="w">
+         </span><span class="nf">foo</span><span class="p">(</span>
         <span class="n">req</span><span class="p">):</span>
         <span class="gp">... </span>
             <span class="k">return</span> <span class="n">req</span>
diff --git a/tox.ini b/tox.ini
index 5b3e97d..3692f57 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py{38,39,310,311,312}
+envlist = py{311,312,313,314,315}
 isolated_build = True
 
 [testenv]