diff --git a/TobiChallenge/requirements.txt b/TobiChallenge/requirements.txt
index 90f78e1..c89b98f 100644
--- a/TobiChallenge/requirements.txt
+++ b/TobiChallenge/requirements.txt
@@ -27,7 +27,7 @@ jmespath==0.9.4
 jsonschema==2.6.0
 msrest==0.4.29
 murmurhash==1.0.2
-nltk==3.4
+nltk==3.4.5
 numpy==1.16.2
 oauthlib==3.0.1
 parso==0.3.4