diff --git a/anaconda/anaconda-requirements.txt b/anaconda/anaconda-requirements.txt
index 7fa221b..9a34ebc 100644
--- a/anaconda/anaconda-requirements.txt
+++ b/anaconda/anaconda-requirements.txt
@@ -145,7 +145,7 @@ nbconvert==5.5.0
 nbformat==4.4.0 
 ncurses==6.1 
 networkx==2.3 
-nltk==3.4.4 
+nltk==3.6.5 
 nose==1.3.7 
 notebook==6.0.0 
 numba==0.44.1