diff --git a/makesite.py b/makesite.py
index 93c70b5..aa95a1c 100755
--- a/makesite.py
+++ b/makesite.py
@@ -53,7 +53,7 @@ locale.setlocale(locale.LC_ALL, "")
 # initialize markdown
 
 
-class HighlightRenderer(mistune.Renderer):
+class HighlightRenderer(mistune.HTMLRenderer):
     options = {"escape": False, "hard_wrap": True}
 
     def block_code(self, code, lang=None):
@@ -64,8 +64,7 @@ class HighlightRenderer(mistune.Renderer):
         return highlight(code, lexer, formatter)
 
 
-renderer = HighlightRenderer()
-markdown = mistune.Markdown(renderer=renderer)
+markdown = mistune.Markdown(renderer=HighlightRenderer())
 
 
 def fread(filename):
diff --git a/poetry.lock b/poetry.lock
index 23bc0db..20b8065 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -8,7 +8,7 @@ python-versions = "*"
 
 [[package]]
 name = "charset-normalizer"
-version = "2.0.11"
+version = "2.0.12"
 description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
 category = "main"
 optional = false
@@ -83,8 +83,8 @@ certifi = [
     {file = "certifi-2021.10.8.tar.gz", hash = "sha256:78884e7c1d4b00ce3cea67b44566851c4343c120abd683433ce934a68ea58872"},
 ]
 charset-normalizer = [
-    {file = "charset-normalizer-2.0.11.tar.gz", hash = "sha256:98398a9d69ee80548c762ba991a4728bfc3836768ed226b3945908d1a688371c"},
-    {file = "charset_normalizer-2.0.11-py3-none-any.whl", hash = "sha256:2842d8f5e82a1f6aa437380934d5e1cd4fcf2003b06fed6940769c164a480a45"},
+    {file = "charset-normalizer-2.0.12.tar.gz", hash = "sha256:2857e29ff0d34db842cd7ca3230549d1a697f96ee6d3fb071cfa6c7393832597"},
+    {file = "charset_normalizer-2.0.12-py3-none-any.whl", hash = "sha256:6881edbebdb17b39b4eaaa821b438bf6eddffb4468cf344f09f89def34a8b1df"},
 ]
 idna = [
     {file = "idna-3.3-py3-none-any.whl", hash = "sha256:84d9dd047ffa80596e0f246e2eab0b391788b0503584e8945f2368256d2735ff"},