diff --git a/requirements.txt b/requirements.txt
index 8c2da5b..1ae02fd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ chardet==3.0.4
 idna==2.7
 langdetect==1.0.7
 lxml==4.2.4
-nltk==3.3
+nltk==3.6.3
 pyTelegramBotAPI==3.6.6
 pytz==2018.5
 requests==2.7.0