diff --git a/docker/Dockerfile.base b/docker/Dockerfile.base
index 1958523c..c6bec2de 100644
--- a/docker/Dockerfile.base
+++ b/docker/Dockerfile.base
@@ -7,7 +7,7 @@
 #
 
 # See https://hub.docker.com/_/ruby
-FROM docker.io/library/ruby:3.4-slim@sha256:d77fc2809d1e9b461bdd305694b6d69f036b477b9ab6f69cd677d88aede2f1eb
+FROM docker.io/library/ruby:4.0-slim@sha256:4b22eda4dcefe3857676d3f5018c576c72d162dae26a0f1190f79f5a7d8671f3
 
 # The values will be passed in with --build-arg
 ARG USER_ID