diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 78d499f..727ea58
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ MarkupSafe==1.0
 matplotlib==2.0.0
 MySQL-python==1.2.5
 mysqlclient==1.3.7
-nltk==3.2.2
+nltk==3.6.3
 numpy==1.12.0
 olefile==0.44
 packaging==16.8