diff --git a/tools/app_generator/requirements.txt b/tools/app_generator/requirements.txt
index e98492ff..00d63e4c 100644
--- a/tools/app_generator/requirements.txt
+++ b/tools/app_generator/requirements.txt
@@ -3,6 +3,7 @@ cffi==1.16.0
 click==8.1.7
 dominate==2.8.0
 Flask==3.0.0
+flask_babel~=4.0.0
 Flask-Bootstrap==3.3.7.1
 Flask-Cors==4.0.0
 Flask-Misaka==1.0.0