diff --git a/requirements.txt b/requirements.txt
index 24c6e5c..9bd4651 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ matplotlib>=3.1.2
 seaborn>=0.9.0
 fpdf==1.7.2
 wordcloud==1.5.0
-nltk==3.4.5
+nltk==3.6.5
 ordered-set>=3.1.0
 dill>=0.3.0
 yattag==1.12.2
diff --git a/setup.py b/setup.py
index d774971..9da3e5f 100644
--- a/setup.py
+++ b/setup.py
@@ -37,7 +37,7 @@ def get_version():
                       'seaborn>=0.9.0',
                       'fpdf==1.7.2',
                       'wordcloud==1.5.0',
-                      'nltk==3.4.5',
+                      'nltk==3.6.5',
                       'ordered-set>=3.1.0',
                       'lime>=0.1.1, <=2',
                       'dill>=0.3.0',