diff --git a/VertebralColumn_KNN/requirements.txt b/VertebralColumn_KNN/requirements.txt
index 2c6a81b..c6928b8 100644
--- a/VertebralColumn_KNN/requirements.txt
+++ b/VertebralColumn_KNN/requirements.txt
@@ -39,7 +39,7 @@ jupyter-core==4.4.0
 kiwisolver==1.0.1
 MarkupSafe==1.0
 matplotlib==2.2.3
-mistune==0.8.3
+mistune==2.0.3
 mkl-fft==1.0.4
 mkl-random==1.0.1
 more-itertools==7.2.0