diff --git a/tei2json/requirements.txt b/tei2json/requirements.txt
index dbb06c7..7daf30c 100644
--- a/tei2json/requirements.txt
+++ b/tei2json/requirements.txt
@@ -44,7 +44,7 @@ jupyterlab==2.1.1
 jupyterlab-server==1.1.1
 lxml==4.5.0
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.6.1
 nbformat==5.0.6
 notebook==6.0.3