diff --git a/requirements.txt b/requirements.txt
index a0f5fe5..255e46f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-nltk==3.4.5
+nltk==3.6
 numpy==1.18.1
 ChatterBot==1.0.5
 gensim==3.8.1