diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97b2cfa..84395c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## 3.1.11 (not yet released)
- * 
+ * Upgraded to Ruby 3.4.10 (from 3.4.9)
+ * Upgraded to Ruby 4.0.6 (from 4.0.5)
 
 ## 3.1.10 (release date: 2026-06-26)
  * Upgraded to Phusion Passenger 6.1.6 (was 6.1.5)
diff --git a/README.md b/README.md
index 3471566..fe1de2f 100644
--- a/README.md
+++ b/README.md
@@ -94,9 +94,9 @@ Basics (learn more at [baseimage-docker](http://phusion.github.io/baseimage-dock
 
 Language support:
 
- * Ruby 3.3.11, 3.4.9, 4.0.5 and JRuby 10.0.2.0 and 9.4.14.0.
+ * Ruby 3.3.11, 3.4.10, 4.0.6 and JRuby 10.0.2.0 and 9.4.14.0.
    * RVM is used to manage Ruby versions. [Why RVM?](#why_rvm)
-   * 4.0.5 is configured as the default.
+   * 4.0.6 is configured as the default.
    * JRuby uses OpenJDK 17 (9.4) or 21 (10.0).
  * Python 3.12, or any version provided by the Deadsnakes PPA (currently 3.10, 3.11, 3.12, 3.13, 3,14; see https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa).
  * Node.js 24 by default, or any version provided by Nodesource (currently 20, 22, 24; see https://github.com/nodesource/distributions).
@@ -448,10 +448,10 @@ The default Ruby (what the `/usr/bin/ruby` command executes) is the latest Ruby
 ```dockerfile
 # Ruby 3.3.11
 RUN bash -lc 'rvm --default use ruby-3.3.11'
-# Ruby 3.4.9
-RUN bash -lc 'rvm --default use ruby-3.4.9'
-# Ruby 4.0.5
-RUN bash -lc 'rvm --default use ruby-4.0.5'
+# Ruby 3.4.10
+RUN bash -lc 'rvm --default use ruby-3.4.10'
+# Ruby 4.0.6
+RUN bash -lc 'rvm --default use ruby-4.0.6'
 # JRuby 9.4.9.0
 RUN bash -lc 'rvm --default use jruby-9.4.9.0'
 # JRuby 10.0.0.0
@@ -470,20 +470,20 @@ $ rvm-exec 3.3.11 ruby -v
 Using /usr/local/rvm/gems/ruby-3.3.11
 ruby 3.3.11 (2026-03-26 revision 1f2d15125a) [x86_64-linux]
 
-$ rvm-exec 3.4.9 ruby -v
-Using /usr/local/rvm/gems/ruby-3.4.9
-ruby 3.4.9 (2026-03-11 revision 76cca827ab) +PRISM [x86_64-linux]
+$ rvm-exec 3.4.10 ruby -v
+Using /usr/local/rvm/gems/ruby-3.4.10
+ruby 3.4.10 (2026-06-30 revision 2b0b7728dc) +PRISM [x86_64-linux]
 
-$ rvm-exec 4.0.5 ruby -v
-Using /usr/local/rvm/gems/ruby-4.0.5
-ruby 4.0.5 (2026-05-20 revision 64336ffd0e) +PRISM [x86_64-linux]
+$ rvm-exec 4.0.6 ruby -v
+Using /usr/local/rvm/gems/ruby-4.0.6
+ruby 4.0.6 (2026-07-14 revision 03b6d3f889) +PRISM [x86_64-linux]
 ```
 
 More examples, but with Bundler instead:
 
 ```bash
-# This runs 'bundle install' using Ruby 3.4.9
-rvm-exec 3.4.9 bundle install
+# This runs 'bundle install' using Ruby 3.4.10
+rvm-exec 3.4.10 bundle install
 ```
 
 <a name="default_ruby_wrapper_scripts"></a>
diff --git a/image/nginx-passenger.sh b/image/nginx-passenger.sh
index 9395a0f..df4d584 100755
--- a/image/nginx-passenger.sh
+++ b/image/nginx-passenger.sh
@@ -9,7 +9,7 @@ header "Installing Phusion Passenger..."
 ## Install it through RVM, not APT, so that the -customizable variant cannot end up
 ## having Ruby installed from both APT and RVM.
 if [[ ! -e /usr/bin/ruby ]]; then
-	RVM_ID="ruby-4.0.5"
+	RVM_ID="ruby-4.0.6"
 
 	run mkdir -p "/build_cache/${ARCH}"
 	if [[ -e "/build_cache/${ARCH}/${RVM_ID}.tar.bz2" ]]; then
diff --git a/image/ruby-3.4.9.sh b/image/ruby-3.4.10.sh
similarity index 100%
rename from image/ruby-3.4.9.sh
rename to image/ruby-3.4.10.sh
diff --git a/image/ruby-4.0.5.sh b/image/ruby-4.0.6.sh
similarity index 100%
rename from image/ruby-4.0.5.sh
rename to image/ruby-4.0.6.sh