diff --git a/.ruby-version b/.ruby-version
index 2aa5131992..fcdb2e109f 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.7
+4.0.0
diff --git a/Dockerfile b/Dockerfile
index 4bf16d6e64..167061d639 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.4.7-slim
+FROM ruby:4.0.0-slim
 
 # Major version of Node.js to install
 ARG nodeVersion=22