diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index f9875fe..45c52dd
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 numpy==1.14.3
-nltk==3.2.1
+nltk==3.4.5
 torch==0.3.1