diff --git a/bin/run b/bin/run
index dc6220f0f1..f7ea7c9633 100755
--- a/bin/run
+++ b/bin/run
@@ -93,13 +93,15 @@ function main() {
   local phase
   phase="$(basename "${0}")"
 
-  if ! which ruby > /dev/null; then
-    mkdir -p "${RUBY_DIR}"
+  # Always install and use buildpack Ruby to ensure consistent version
+  # regardless of system Ruby availability
+  mkdir -p "${RUBY_DIR}"
 
+  if [ ! -d "${RUBY_DIR}/bin" ]; then
     util::install
-    util::environment::setup
   fi
 
+  util::environment::setup
 
   exec "${BUILDPACK_DIR}/bin/ruby-run" "${phase}" "${@-}"
 }
diff --git a/config/ruby.yml b/config/ruby.yml
index 94541f7ee4..0d05199092 100644
--- a/config/ruby.yml
+++ b/config/ruby.yml
@@ -14,6 +14,8 @@
 # limitations under the License.
 
 # Configuration for Ruby
+# Note: Ruby 3.2.8+ is required for Psych 5.0.1+ which supports YAML.load_file
+# with permitted_classes and aliases keyword arguments used throughout the buildpack
 ---
 version: 3.2.+
 repository_root: https://raw.githubusercontent.com/cloudfoundry/ruby-buildpack/master/java-index