diff --git a/data/grounded/trial/src/requirements.txt b/data/grounded/trial/src/requirements.txt
index 46f2c6ff..8deaf077 100644
--- a/data/grounded/trial/src/requirements.txt
+++ b/data/grounded/trial/src/requirements.txt
@@ -1,2 +1,2 @@
-nltk==3.4.1
+nltk==3.6.6
 beautifulsoup4==4.6.0