diff --git a/requirements.txt b/requirements.txt
index 4c48e17..448f12c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 numpy==1.8.0
-nltk==2.0.5
+nltk==3.4.5
 scipy==0.13.2
 scikit-learn==0.15.2
 goose-extractor==1.0.25
diff --git a/setup.py b/setup.py
index ab423ea..6b01c3b 100644
--- a/setup.py
+++ b/setup.py
@@ -55,7 +55,7 @@ def read(filename):
     ],
     install_requires=[
         'numpy==1.8.0',
-        'nltk==2.0.5',
+        'nltk==3.4.5',
         'scipy==0.13.2',
         'scikit-learn==0.15.2',
         'goose-extractor==1.0.25',