diff --git a/requirements.txt b/requirements.txt
index 2cda191..a4a5cbb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,4 +22,4 @@ requests_oauthlib==0.8.0
 oauthlib==3.0.0
 PyPDF2==1.26.0
 tika==1.19
-nltk==3.4.5
+nltk==3.6.6