diff --git a/open-lessons/helper-funcs.21.02.2022/requirements.txt b/open-lessons/helper-funcs.21.02.2022/requirements.txt
index efce7926..134fc629 100644
--- a/open-lessons/helper-funcs.21.02.2022/requirements.txt
+++ b/open-lessons/helper-funcs.21.02.2022/requirements.txt
@@ -30,7 +30,7 @@ nbclient==0.5.11
 nbconvert==6.4.2
 nbformat==5.1.3
 nest-asyncio==1.5.4
-notebook==6.4.8
+notebook==6.4.12
 packaging==21.3
 pandocfilters==1.5.0
 parso==0.8.3