diff --git a/commit.py b/commit.py
index a04aa00..0e426a7 100644
--- a/commit.py
+++ b/commit.py
@@ -39,18 +39,16 @@ def extendMarkdown(self, md, md_globals):
         pre = CommitPreprocessor(md)
 
         md.registerExtension(self)
-        md.preprocessors.add('commit', pre, ">normalize_whitespace")
+        md.preprocessors.register(pre, 'commit', 25)
 
 
 class CommitPreprocessor(Preprocessor):
 
     def __init__(self, md):
         Preprocessor.__init__(self, md)
-        self._markdown = md
 
     def run(self, lines):
         new_lines = []
-        self._markdown._meta_result = {}
 
         for line in lines:
             new_line = replace_commit_line(line)
diff --git a/fix_display_error.py b/fix_display_error.py
new file mode 100644
index 0000000..5a3c04b
--- /dev/null
+++ b/fix_display_error.py
@@ -0,0 +1,75 @@
+# -*- coding: utf-8 -*-
+"""
+表示崩れを事前修正
+=========================================
+
+Markdownライブラリの以下の制限を回避：
+
+- 箇条書きの前に空行が必要な制限を回避して、自動で空行を挟む
+"""
+
+import re
+import datetime
+
+from markdown.extensions import Extension
+from markdown.preprocessors import Preprocessor
+
+def is_item_line(line: str) -> bool:
+    stripped_line = line.strip()
+    m = re.match(r'^([0-9]+\.\s)', stripped_line)
+    if m:
+        return True
+
+    m = re.match(r'^([*+-]\s)', stripped_line)
+    if m:
+        return True
+    return False
+
+def is_item_end_line(line: str) -> bool:
+    if len(line) == 0:
+        return True
+    if re.match(r'^#+ ', line):
+        return True
+    return False
+
+class FixDisplayErrorExtension(Extension):
+
+    def extendMarkdown(self, md, md_globals):
+        pre = FixDisplayErrorPreprocessor(md)
+
+        md.registerExtension(self)
+        md.preprocessors.register(pre, 'fix_display_error', 28)
+
+
+class FixDisplayErrorPreprocessor(Preprocessor):
+
+    def __init__(self, md):
+        Preprocessor.__init__(self, md)
+
+    def run(self, lines):
+        new_lines = []
+
+        prev_line: str | None = None
+        in_item: bool = False
+        for line in lines:
+            if prev_line == None:
+                prev_line = line
+                new_lines.append(line)
+                continue
+
+            if not is_item_line(prev_line) and not in_item and is_item_line(line):
+                new_lines.append("")
+
+            if not in_item and is_item_line(line):
+                in_item = True
+            if in_item and is_item_end_line(line):
+                in_item = False
+
+            prev_line = line
+            new_lines.append(line)
+
+        return new_lines
+
+
+def makeExtension(**kwargs):
+    return FixDisplayErrorExtension(**kwargs)
diff --git a/footer.py b/footer.py
index 6920132..d3ee452 100644
--- a/footer.py
+++ b/footer.py
@@ -20,7 +20,8 @@ def extendMarkdown(self, md, md_globals):
         footer = FooterTreeprocessor()
         footer.config = self.getConfigs()
         md.registerExtension(self)
-        md.treeprocessors.add('footer', footer, '_begin')
+        #md.treeprocessors.add('footer', footer, '_begin')
+        md.treeprocessors.register(footer, 'footer', 50) # top priority (begin)
 
 
 class FooterTreeprocessor(markdown.treeprocessors.Treeprocessor):
diff --git a/mark.py b/mark.py
index 3d49ce9..e317a59 100644
--- a/mark.py
+++ b/mark.py
@@ -31,18 +31,16 @@ def extendMarkdown(self, md, md_globals):
         markpre = MarkPreprocessor(md)
 
         md.registerExtension(self)
-        md.preprocessors.add('mark', markpre, ">normalize_whitespace")
+        md.preprocessors.register(markpre, 'mark', 25)
 
 
 class MarkPreprocessor(Preprocessor):
 
     def __init__(self, md):
         Preprocessor.__init__(self, md)
-        self._markdown = md
 
     def run(self, lines):
         new_lines = []
-        self._markdown._meta_result = {}
         pattern = re.compile("|".join(map(re.escape, MARK_DICT.keys())))
 
         for line in lines:
diff --git a/mathjax.py b/mathjax.py
index 09af179..68b923f 100644
--- a/mathjax.py
+++ b/mathjax.py
@@ -28,7 +28,7 @@ def extendMarkdown(self, md, md_globals):
         mathjaxpre = MathJaxPreprocessor(md)
 
         md.registerExtension(self)
-        md.preprocessors.add('mathjax', mathjaxpre, ">normalize_whitespace")
+        md.preprocessors.register(mathjaxpre, 'mathjax', 25)
 
 
 class MathJaxPreprocessor(Preprocessor):
diff --git a/meta.py b/meta.py
index ecb858f..6994d92 100644
--- a/meta.py
+++ b/meta.py
@@ -40,8 +40,8 @@ def extendMarkdown(self, md, md_globals):
         metapost = MetaPostprocessor(md)
 
         md.registerExtension(self)
-        md.preprocessors.add('meta', metapre, ">normalize_whitespace")
-        md.postprocessors.add('meta', metapost, '_end')
+        md.preprocessors.register(metapre, 'meta', 25)
+        md.postprocessors.register(metapost, 'meta', 0) # bottom priority (end)
 
 
 class MetaPreprocessor(Preprocessor):
diff --git a/qualified_fenced_code.py b/qualified_fenced_code.py
index 2cde1cd..ddeb4ac 100644
--- a/qualified_fenced_code.py
+++ b/qualified_fenced_code.py
@@ -65,7 +65,7 @@ def extendMarkdown(self, md, md_globals):
         fenced_block = QualifiedFencedBlockPreprocessor(md, self.global_qualify_list)
         md.registerExtension(self)
 
-        md.preprocessors.add('qualified_fenced_code', fenced_block, ">normalize_whitespace")
+        md.preprocessors.register(fenced_block, 'qualified_fenced_code', 29)
 
 
 def _make_random_string():
diff --git a/sponsor.py b/sponsor.py
index ef40335..64e8dd9 100644
--- a/sponsor.py
+++ b/sponsor.py
@@ -80,18 +80,16 @@ def extendMarkdown(self, md, md_globals):
         pre = SponsorPreprocessor(md)
 
         md.registerExtension(self)
-        md.preprocessors.add('sponsor', pre, ">normalize_whitespace")
+        md.preprocessors.register(pre, 'sponsor', 25)
 
 
 class SponsorPreprocessor(Preprocessor):
 
     def __init__(self, md):
         Preprocessor.__init__(self, md)
-        self._markdown = md
 
     def run(self, lines):
         new_lines = []
-        self._markdown._meta_result = {}
 
         jst = datetime.timezone(datetime.timedelta(hours=+9), 'JST')
         now = datetime.datetime.now(jst)