diff --git a/chap-four/requirements.txt b/chap-four/requirements.txt
index 126a9cd..4341fe2 100644
--- a/chap-four/requirements.txt
+++ b/chap-four/requirements.txt
@@ -1,5 +1,5 @@
 # minimal production requirements
 fastapi==0.65.2
 torch==1.9.0
-transformers==4.9.2
+transformers==4.36.0
 uvicorn==0.14.0
\ No newline at end of file