diff --git a/requirements.txt b/requirements.txt
index 0cf654e..fdd7b04 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-nltk==3.2.1
+nltk==3.4.5
 pdfminer==20140328
 wheel==0.24.0
 numpy==1.11.3
diff --git a/setup.py b/setup.py
index 0d1a3fb..51fb792 100644
--- a/setup.py
+++ b/setup.py
@@ -25,6 +25,6 @@
         ],
     },
     install_requires=(
-    	['click','nltk==3.2.1','pdfminer==20140328','wheel==0.24.0','numpy==1.11.3']
+    	['click','nltk==3.4.5','pdfminer==20140328','wheel==0.24.0','numpy==1.11.3']
     )
 )