diff --git a/chapter-4-examples/code-first-using-apiflask/requirements.txt b/chapter-4-examples/code-first-using-apiflask/requirements.txt
index 9f555b0..d51f189 100644
--- a/chapter-4-examples/code-first-using-apiflask/requirements.txt
+++ b/chapter-4-examples/code-first-using-apiflask/requirements.txt
@@ -4,7 +4,7 @@ click==8.1.7
 Flask==3.0.2
 flask-openapi3==3.0.2
 itsdangerous==2.1.2
-Jinja2==3.1.3
+Jinja2==3.1.4
 MarkupSafe==2.1.5
 pydantic==2.6.1
 pydantic_core==2.16.2