diff --git a/extraction/named_entity/Chemlistem/requirements.txt b/extraction/named_entity/Chemlistem/requirements.txt
index 4b41e184..b79331d0 100644
--- a/extraction/named_entity/Chemlistem/requirements.txt
+++ b/extraction/named_entity/Chemlistem/requirements.txt
@@ -29,7 +29,7 @@ scikit-learn==0.19.1
 scipy==1.2.1
 six==1.12.0
 spacy==1.9.0
-tensorflow==1.4.0
+tensorflow==2.6.4
 tensorflow-tensorboard==0.4.0
 termcolor==1.1.0
 thinc==6.5.2