diff --git a/requirements.txt b/requirements.txt
index 8228e51..4ce5a13 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -43,7 +43,7 @@ Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==2.2.2
 monotonic==1.5
-nltk==3.4
+nltk==3.4.5
 numpy==1.16.4
 numpydoc==0.8.0
 opencv-python==4.1.0.25