diff --git a/src/Diagnostics.AIProjects/TrainingAPI/__app__/requirements.txt b/src/Diagnostics.AIProjects/TrainingAPI/__app__/requirements.txt
index b0a83719a..73de0b482 100644
--- a/src/Diagnostics.AIProjects/TrainingAPI/__app__/requirements.txt
+++ b/src/Diagnostics.AIProjects/TrainingAPI/__app__/requirements.txt
@@ -1,4 +1,4 @@
-nltk==3.4
+nltk==3.6.5
 gensim==3.7.2
 azure-functions
 azure-storage-blob==12.5.0