diff --git a/.ruby-version b/.ruby-version
index 2aa51319..fcdb2e10 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.7
+4.0.0
diff --git a/Dockerfile b/Dockerfile
index 177e7cf8..95615491 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.4.7
+FROM ruby:4.0.0
 ENV BUNDLER_VERSION=2.2.6
 
 RUN apt-get update -qq && apt-get install -y