diff --git a/data_extraction/requirements.txt b/data_extraction/requirements.txt
old mode 100755
new mode 100644
index 500a282..5167e68
--- a/data_extraction/requirements.txt
+++ b/data_extraction/requirements.txt
@@ -1,4 +1,4 @@
 chardet==3.0.4
-nltk==3.4.1
+nltk==3.6.6
 beautifulsoup4==4.6.0
 zstandard==0.18.0