diff --git a/modules/text/machine_translation/transformer/en-de/requirements.txt b/modules/text/machine_translation/transformer/en-de/requirements.txt
index 9101f34f6ac0375434c2754362ab941006635939..270d8d38e7f8c0167f3033159c9f13a671bcb4a3 100644
--- a/modules/text/machine_translation/transformer/en-de/requirements.txt
+++ b/modules/text/machine_translation/transformer/en-de/requirements.txt
@@ -1,2 +1,2 @@
-nltk==3.2.5
+nltk==3.4.5
 subword-nmt