diff --git a/image-recognition/requirements.txt b/image-recognition/requirements.txt
index 99ed130..9d7a864 100644
--- a/image-recognition/requirements.txt
+++ b/image-recognition/requirements.txt
@@ -96,7 +96,7 @@ navigator-updater==0.2.1
 nbconvert==5.4.1
 nbformat==4.4.0
 networkx==2.2
-nltk==3.4
+nltk==3.6.6
 nose==1.3.7
 notebook==5.7.8
 numba==0.43.1