diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index a33ec1e..e97ce96
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ Django==1.10.1
 h5py==2.6.0
 msgpack-python==0.4.8
 MySQL-python==1.2.5
-nltk==3.2.1
+nltk==3.6.3
 numpy==1.11.1
 pika==0.10.0
 Pillow==3.3.0