diff --git a/requirements.txt b/requirements.txt
index 673406b..8a5dae4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ tensorflow==1.8.0 # works on dgx not on Mac...
 # tensorflow==1.14.0 # works on Mac not on dgx...
 tensorboardX==1.6
 neo4jrestclient==2.1.1
-nltk == 3.4.1
+nltk == 3.4.5
 google-cloud-vision==0.34
 google-auth==1.5.1
 opencv-python==3.4.2.16
diff --git a/smtag/requirements.txt b/smtag/requirements.txt
index c35207d..877a1ac 100644
--- a/smtag/requirements.txt
+++ b/smtag/requirements.txt
@@ -5,7 +5,7 @@ numpy==1.16.3
 torch==1.0.1
 torchvision==0.2.2.post3
 neo4jrestclient==2.1.1
-nltk == 3.4.1
+nltk == 3.4.5
 tensorboardX==1.6
 google-cloud-vision==0.34
 google-auth==1.5.1