diff --git a/VertebralColumn_KNN/requirements.txt b/VertebralColumn_KNN/requirements.txt
index 2c6a81b..feec1e4 100644
--- a/VertebralColumn_KNN/requirements.txt
+++ b/VertebralColumn_KNN/requirements.txt
@@ -6,7 +6,7 @@ attrs==18.2.0
 Automat==0.7.0
 backcall==0.1.0
 beautifulsoup4==4.8.1
-bleach==2.1.4
+bleach==3.1.4
 blis==0.4.1
 certifi==2018.8.24
 cffi==1.11.5