diff --git a/requirements.txt b/requirements.txt
index e6e2a26..1fabe1d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 scikit-learn==0.22
 numpy==1.17.4
 pandas==0.25.3
-nltk==3.4.5
\ No newline at end of file
+nltk==3.9
\ No newline at end of file