diff --git a/markdownify/__init__.py b/markdownify/__init__.py
index cc3d153..3272ce5 100644
--- a/markdownify/__init__.py
+++ b/markdownify/__init__.py
@@ -213,7 +213,7 @@ def __getattr__(self, attr):
             n = int(m.group(1))
 
             def convert_tag(el, text, convert_as_inline):
-                return self.convert_hn(n, el, text, convert_as_inline)
+                return self._convert_hn(n, el, text, convert_as_inline)
 
             convert_tag.__name__ = 'convert_h%s' % n
             setattr(self, convert_tag.__name__, convert_tag)
@@ -311,10 +311,14 @@ def convert_code(self, el, text, convert_as_inline):
 
     convert_kbd = convert_code
 
-    def convert_hn(self, n, el, text, convert_as_inline):
+    def _convert_hn(self, n, el, text, convert_as_inline):
+        """ Method name prefixed with _ to prevent <hn> to call this """
         if convert_as_inline:
             return text
 
+        # prevent MemoryErrors in case of very large n
+        n = max(1, min(6, n))
+
         style = self.options['heading_style'].lower()
         text = text.strip()
         if style == UNDERLINED and n <= 2:
diff --git a/pyproject.toml b/pyproject.toml
index 51604d8..e5ce8cb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "markdownify"
-version = "0.14.0"
+version = "0.14.1"
 authors = [{name = "Matthew Tretter", email = "m@tthewwithanm.com"}]
 description = "Convert HTML to markdown."
 readme = "README.rst"
diff --git a/tests/test_conversions.py b/tests/test_conversions.py
index 0be1d0c..2283c29 100644
--- a/tests/test_conversions.py
+++ b/tests/test_conversions.py
@@ -133,6 +133,8 @@ def test_hn():
     assert md('<h4>Hello</h4>') == '\n#### Hello\n\n'
     assert md('<h5>Hello</h5>') == '\n##### Hello\n\n'
     assert md('<h6>Hello</h6>') == '\n###### Hello\n\n'
+    assert md('<h10>Hello</h10>') == md('<h6>Hello</h6>')
+    assert md('<hn>Hello</hn>') == md('Hello')
 
 
 def test_hn_chained():