diff --git a/requirements.txt b/requirements.txt
index 212e970..6f02849 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ idna==2.7
 kiwisolver==1.0.1
 lxml==4.2.5
 matplotlib==3.0.2
-nltk==3.4
+nltk==3.4.5
 nose==1.3.7
 numpy==1.15.4
 pandas==0.23.4