diff --git a/requirements.txt b/requirements.txt
index 08b6b4d..ec4d99c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ pyreadr==0.2.3
 pytorch==1.2.0
 numpy==1.17.2
 h5py==2.10.0
-nltk==3.4.4
+nltk==3.4.5
 pandas==0.25.1
 matplotlib==3.1.1
 coverage==5.0.2