diff --git a/chap-four/requirements.txt b/chap-four/requirements.txt
index e444eaf..98378a5 100644
--- a/chap-four/requirements.txt
+++ b/chap-four/requirements.txt
@@ -1,5 +1,5 @@
 # minimal production requirements
-fastapi==0.65.2
+fastapi==0.109.1
 torch==1.13.1
 transformers==4.9.2
 uvicorn==0.14.0
\ No newline at end of file