diff --git a/2018-pykonik-40-python-systemd/requirements.txt b/2018-pykonik-40-python-systemd/requirements.txt
index 8216535..76c6aee 100644
--- a/2018-pykonik-40-python-systemd/requirements.txt
+++ b/2018-pykonik-40-python-systemd/requirements.txt
@@ -20,7 +20,7 @@ MarkupSafe==1.1.0
 mistune==0.8.4
 nbconvert==5.4.0
 nbformat==4.4.0
-notebook==5.7.2
+notebook==6.4.1
 pandocfilters==1.4.2
 parso==0.3.1
 pexpect==4.6.0