Index: nbconvert/exporters/html.py
--- nbconvert/exporters/html.py.orig
+++ nbconvert/exporters/html.py
@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+# coding: utf-8
 """HTML Exporter class"""
 
 # Copyright (c) Jupyter Development Team.
@@ -9,7 +10,7 @@ import os
 from traitlets import default, Unicode
 from traitlets.config import Config
 from jupyter_core.paths import jupyter_path
-from jinja2 import contextfilter
+from jinja2 import pass_context as contextfilter
 
 from nbconvert.filters.highlight import Highlight2HTML
 from nbconvert.filters.markdown_mistune import IPythonRenderer, MarkdownWithMath