diff --git a/Dockerfile b/Dockerfile
index 3001380..ef939c7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.4-slim-bookworm
+FROM ruby:4.0-slim-bookworm
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \