diff --git a/experimental/extract_pov_edits/requirements.txt b/experimental/extract_pov_edits/requirements.txt
index 5b167db5..30453a10 100644
--- a/experimental/extract_pov_edits/requirements.txt
+++ b/experimental/extract_pov_edits/requirements.txt
@@ -6,4 +6,4 @@ nose==1.3.7
 boto==2.48.0
 gcs_oauth2_boto_plugin==2.1
 mwparserfromhell==0.5.1
-nltk==3.6.6
+nltk==3.9