diff --git a/collector/requirements.txt b/collector/requirements.txt
index 15c9ca3..35dbc79 100644
--- a/collector/requirements.txt
+++ b/collector/requirements.txt
@@ -1,4 +1,4 @@
-nltk==3.1
+nltk==3.6.3
 oauthlib==1.0.3
 python-twitter==2.2
 requests==2.8.1