diff --git a/requirements.txt b/requirements.txt
index f5bf2aa..cc7d9b7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,5 +7,5 @@ mwparserfromhell==0.3.3
 click==1.0.0
 sphinx-rtd-theme==0.1.7
 sphinxcontrib-napoleon==0.3.1
-nltk==3.0.2
+nltk==3.4.5
 numpy==1.9.2