diff --git a/requirements_new.txt b/requirements_new.txt
index 9e0431f..4ac01b6 100644
--- a/requirements_new.txt
+++ b/requirements_new.txt
@@ -94,7 +94,7 @@ multipledispatch==0.4.9
 nbconvert==5.3.1
 nbformat==4.4.0
 networkx==2.1
-nltk==3.2.5
+nltk==3.6.3
 nose==1.3.7
 notebook==5.4.0
 numba==0.42.0