diff --git a/requirements.txt b/requirements.txt
index 39b3dea..66efa7c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 keras==2.2.4
-nltk==3.4
+nltk==3.4.5
 scikit-learn==0.20.2
 tensorflow==1.12.0