diff --git a/Surrogate_MBO/requirements.txt b/Surrogate_MBO/requirements.txt
index 3b02b4b..13c8a00 100644
--- a/Surrogate_MBO/requirements.txt
+++ b/Surrogate_MBO/requirements.txt
@@ -65,7 +65,7 @@ Markdown==3.1
 MarkupSafe==1.1.1
 matplotlib==3.1.1
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==8.2.0
 mpi4py==3.0.3
 multidict==4.7.5