diff --git a/TrackingNtuples/scripts/mlenv-requirements.txt b/TrackingNtuples/scripts/mlenv-requirements.txt
index fc79e9c..f9adb97 100644
--- a/TrackingNtuples/scripts/mlenv-requirements.txt
+++ b/TrackingNtuples/scripts/mlenv-requirements.txt
@@ -40,7 +40,7 @@ kiwisolver==1.0.1
 Markdown==3.0.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
-mistune==0.8.4
+mistune==2.0.3
 mock==2.0.0
 nbconvert==5.4.1
 nbdime==1.0.5
diff --git a/TrackingNtuples/scripts/venv-requirements.txt b/TrackingNtuples/scripts/venv-requirements.txt
index 2cb1324..fe3d3db 100644
--- a/TrackingNtuples/scripts/venv-requirements.txt
+++ b/TrackingNtuples/scripts/venv-requirements.txt
@@ -41,7 +41,7 @@ lz4==2.1.2
 Markdown==3.0.1
 MarkupSafe==1.1.0
 matplotlib==2.2.3
-mistune==0.8.4
+mistune==2.0.3
 mock==2.0.0
 msgpack==0.6.1
 nbconvert==5.4.0