diff --git a/requirements.txt b/requirements.txt
index 346ce1a..fa30051 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 ChatterBot==0.8.1
-nltk==3.2.5
+nltk==3.4.5
 rivescript==1.14.9
 pygame==1.9.3
 aspell-fr