diff --git a/data_scientist/project_4_analyzing_subway_data/requirements.txt b/data_scientist/project_4_analyzing_subway_data/requirements.txt
index 8146819..4ae6fee 100644
--- a/data_scientist/project_4_analyzing_subway_data/requirements.txt
+++ b/data_scientist/project_4_analyzing_subway_data/requirements.txt
@@ -30,7 +30,7 @@ kiwisolver==1.1.0
 lxml==4.4.0
 markupsafe==1.1.1
 matplotlib==3.1.1
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.5.0
 nbformat==4.4.0
 notebook==6.0.0