diff --git a/jddc2020_baseline/mhred/tensorflow2/requirements.txt b/jddc2020_baseline/mhred/tensorflow2/requirements.txt
index 8dccdec..2557879 100644
--- a/jddc2020_baseline/mhred/tensorflow2/requirements.txt
+++ b/jddc2020_baseline/mhred/tensorflow2/requirements.txt
@@ -1,7 +1,7 @@
 tensorflow==2.1.0
 jieba==0.39
 numpy==1.14.5
-nltk==3.3
+nltk==3.4.5
 Keras==2.3.1                 
 Keras-Applications==1.0.8 
 tqdm==4.28.1