diff --git a/requirements.txt b/requirements.txt
index 83a36c6..8ad3007 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
 vastai-sdk>=0.3.0
-nltk
\ No newline at end of file
+nltk==3.9.4 
\ No newline at end of file