diff --git a/requirements.txt b/requirements.txt
index a7956c6..8221b92 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-nltk==3.4.5
+nltk==3.6.6
 grpcio-tools==1.25.0
 grpcio==1.25.0
\ No newline at end of file