diff --git a/.ruby-version b/.ruby-version
index 34cde569..47b322c9 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.2.6
+3.4.1
diff --git a/Dockerfile b/Dockerfile
index 68be301a..43ecdb31 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.2.6-slim@sha256:c582e3505878002d0b6e316d14a4543d276c84ba040afc73fceef25b6321f80f
+FROM ruby:3.4.1-slim@sha256:603e33624701c40e0df508e7d7fa8505e405a8a9b607e9bc6abedcf48782655d
 
 # Add build-essential tools.
 RUN apt-get update -qq && \