diff --git a/2018-pykonik-40-python-systemd/requirements.txt b/2018-pykonik-40-python-systemd/requirements.txt
index 8216535..c3f1d9e 100644
--- a/2018-pykonik-40-python-systemd/requirements.txt
+++ b/2018-pykonik-40-python-systemd/requirements.txt
@@ -17,7 +17,7 @@ jupyter-client==5.2.3
 jupyter-console==6.0.0
 jupyter-core==4.4.0
 MarkupSafe==1.1.0
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.4.0
 nbformat==4.4.0
 notebook==5.7.2