diff --git a/requirements.txt b/requirements.txt
index ac3f068..627a074 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-nltk==3.4.5
+nltk==3.9
 scikit-learn==0.21.3
 mysqlclient==1.4.4
\ No newline at end of file