diff --git a/with-sinatra/Dockerfile b/with-sinatra/Dockerfile
index 1387dfe8..56b7cd14 100644
--- a/with-sinatra/Dockerfile
+++ b/with-sinatra/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.3.0
+FROM ruby:3.4.8
 RUN apt-get update -qq && apt-get install -y build-essential
 
 RUN mkdir -p /app