diff --git a/.github/Dockerfile.base b/.github/Dockerfile.base
index 9f982579..405573d0 100644
--- a/.github/Dockerfile.base
+++ b/.github/Dockerfile.base
@@ -3,7 +3,7 @@
 # call this from rails root: podman build -t mapforge-base -f .github/Dockerfile.base .
 
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
-ARG RUBY_VERSION=4.0.0
+ARG RUBY_VERSION=4.0.5
 FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base
 
 LABEL org.opencontainers.image.source="https://github.com/mapforge-org/mapforge"
diff --git a/.gitignore b/.gitignore
index f05e1622..40e166d8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,7 @@
 
 # Ignore bundler config.
 /.bundle
+/vendor/bundle
 
 # Ignore all environment files (except templates).
 /.env*
diff --git a/.ruby-version b/.ruby-version
index fcdb2e10..7636e756 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-4.0.0
+4.0.5
diff --git a/Gemfile b/Gemfile
index 4c00fa8f..26f69fc8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source "https://rubygems.org"
-ruby "4.0.0"
+ruby "4.0.5"
 
 gem "rails"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index cc4fc45a..454652ae 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -105,7 +105,7 @@ GEM
     benchmark (0.5.0)
     bigdecimal (4.1.2)
     bindex (0.8.1)
-    bootsnap (1.24.1)
+    bootsnap (1.24.4)
       msgpack (~> 1.2)
     brakeman (8.0.4)
       racc
@@ -702,7 +702,7 @@ DEPENDENCIES
   yabeda-rails
 
 RUBY VERSION
-  ruby 4.0.0p0
+  ruby 4.0.5
 
 BUNDLED WITH
   4.0.3