diff --git a/test/Dockerfile.distro b/test/Dockerfile.distro
index e8a358b617..d912d06f44 100644
--- a/test/Dockerfile.distro
+++ b/test/Dockerfile.distro
@@ -214,7 +214,7 @@ RUN install-tool uv 0.10.1
 FROM build AS test-ruby
 
 # renovate: datasource=github-releases packageName=containerbase/ruby-prebuild versioning=ruby
-RUN install-tool ruby 3.4.8
+RUN install-tool ruby 4.0.1
 # renovate: datasource=rubygems versioning=ruby
 RUN install-tool bundler 2.7.2
 # renovate: datasource=rubygems versioning=ruby
diff --git a/test/ruby/Dockerfile b/test/ruby/Dockerfile
index aac3ceef42..972034853e 100644
--- a/test/ruby/Dockerfile
+++ b/test/ruby/Dockerfile
@@ -44,7 +44,7 @@ WORKDIR /test
 FROM base AS build
 
 # renovate: datasource=github-releases packageName=containerbase/ruby-prebuild versioning=ruby
-RUN install-tool ruby 3.4.8
+RUN install-tool ruby 4.0.1
 
 #--------------------------------------
 # test: global bundler
diff --git a/test/ruby/Dockerfile.arm64 b/test/ruby/Dockerfile.arm64
index 56172635eb..28d019c902 100644
--- a/test/ruby/Dockerfile.arm64
+++ b/test/ruby/Dockerfile.arm64
@@ -38,7 +38,7 @@ ARG CONTAINERBASE_LOG_LEVEL
 FROM base AS test-ruby
 
 # renovate: datasource=github-releases packageName=containerbase/ruby-prebuild versioning=ruby
-RUN install-tool ruby 3.4.8
+RUN install-tool ruby 4.0.1
 
 #--------------------------------------
 # Image: bundler