diff --git a/requirements.txt b/requirements.txt
index f9aef76..bdd2d02 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ cymem==1.31.2
 gensim==0.13.3
 idna==2.6
 murmurhash==0.26.4
-nltk==3.2.1
+nltk==3.4.5
 numpy==1.11.2
 pathlib==1.0.1
 plac==0.9.6
diff --git a/setup.py b/setup.py
index cae663e..f27db4d 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@ def readme():
         'scipy == 0.18.1',  # or 0.19.0
         'scikit-learn == 0.18.1',
         'spacy == 1.2.0',
-        'nltk == 3.2.1',
+        'nltk == 3.4.5',
 
         # Other
         'requests',