diff --git a/codes/Classic_models/requirements.txt b/codes/Classic_models/requirements.txt
index 5288867..679a0ee 100644
--- a/codes/Classic_models/requirements.txt
+++ b/codes/Classic_models/requirements.txt
@@ -2,7 +2,7 @@
 # pip install -r requirements.txt
 
 numpy==1.15.4
-tensorflow==1.12.0
+tensorflow==2.9.3
 scipy==1.1.0
 hmmlearn==0.2.3
 matplotlib==2.0.2