diff --git a/.circleci/config.yml b/.circleci/config.yml
index 408c291b0..f706e117a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -8,7 +8,7 @@ jobs:
   build:
     parallelism: 1
     docker:
-      - image: cimg/ruby:4.0.2-browsers
+      - image: cimg/ruby:4.0.3-browsers
         environment:
           BUNDLE_PATH: vendor/bundle
           NODE_VERSION: 22.17.1
diff --git a/.ruby-version b/.ruby-version
index 4d54daddb..c4e41f945 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-4.0.2
+4.0.3
diff --git a/.tool-versions b/.tool-versions
index c386704f8..c8fa9df0c 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,4 +1,4 @@
-ruby 4.0.2
+ruby 4.0.3
 nodejs 25.9.0
 postgres 16.8
 pnpm 10.5.2
diff --git a/Dockerfile b/Dockerfile
index c6064d75c..0cc4b1018 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:4.0.2
+FROM ruby:4.0.3
 
 ENV RACK_ENV=production
 ENV RAILS_ENV=production
diff --git a/Gemfile.lock b/Gemfile.lock
index 3f82fb8bf..cdf88700f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -510,7 +510,7 @@ DEPENDENCIES
   with_model
 
 RUBY VERSION
-   ruby 4.0.2
+   ruby 4.0.3
 
 BUNDLED WITH
    2.6.2