diff --git a/pelicanconf.py b/pelicanconf.py
index 5dfebef..183309b 100644
--- a/pelicanconf.py
+++ b/pelicanconf.py
@@ -65,7 +65,11 @@ HIDE_SIDEBAR = True
 PLUGIN_PATHS = ['plugins']
 PLUGINS = ['langmenu', 'talks', 'tipue_search']
 
-MD_EXTENSIONS = ['toc']
+MARKDOWN = {
+    'extension_configs': {
+        'markdown.extensions.toc': {},
+    },
+}
 
 #TALKS = {
 #    u'1': { u'Speaker' : u'',
diff --git a/requirements.txt b/requirements.txt
index f27bc0c..2cb4b8e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,18 +1,19 @@
+arrow==0.4.2
 Babel==2.4.0
 beautifulsoup4==4.6.0
-blinker==1.3
-docutils==0.12
-feedgenerator==1.7
+blinker==1.4
+docutils==0.14
+feedgenerator==1.9
 ics==0.4
-Jinja2==2.7.3
+Jinja2==2.10
 Markdown==2.6.1
-MarkupSafe==0.23
-pelican==3.5.0
-Pygments==2.0.2
-python-dateutil==2.4.1
-pytz==2014.10
+MarkupSafe==1.1.1
+pelican==4.0.0
+Pygments==2.3.1
+python-dateutil==2.8.0
+pytz==2018.9
 PyYAML==3.12
-six==1.9.0
+six==1.12.0
 smartypants==1.8.6
 typogrify==2.0.7
-Unidecode==0.4.17
+Unidecode==1.0.23