diff --git a/data-science-1/requirements.txt b/data-science-1/requirements.txt
index d0dc2ef..d2409b6 100644
--- a/data-science-1/requirements.txt
+++ b/data-science-1/requirements.txt
@@ -1,7 +1,7 @@
 atomicwrites==1.3.0
 attrs==19.1.0
 backcall==0.1.0
-bleach==3.1.0
+bleach==3.1.4
 cycler==0.10.0
 decorator==4.4.0
 defusedxml==0.6.0