diff --git a/prediction/requirements.txt b/prediction/requirements.txt
index 8ffbd7f..605f0a5 100644
--- a/prediction/requirements.txt
+++ b/prediction/requirements.txt
@@ -1,6 +1,6 @@
 numpy==1.11.0
 gensim==1.0.1
-nltk==3.2.2
+nltk==3.4.5
 scipy>=0.15.1
 scikit-learn>=0.18
 matplotlib>=1.4.3