diff --git a/bin/ruby-build b/bin/ruby-build
index 480973f6ab..6de5c479df 100755
--- a/bin/ruby-build
+++ b/bin/ruby-build
@@ -885,7 +885,9 @@ build_package_picoruby() {
   mkdir -p "$PREFIX_PATH"
   cp -fR build/host/* include "$PREFIX_PATH"
   ln -fs picoruby "$PREFIX_PATH/bin/ruby"
-  ln -fs picoirb "$PREFIX_PATH/bin/irb"
+  if [ -f build/host/bin/picoirb ]; then
+    ln -fs picoirb "$PREFIX_PATH/bin/irb"
+  fi
 }
 
 build_package_jruby() {
diff --git a/share/ruby-build/picoruby-3.4.2 b/share/ruby-build/picoruby-3.4.2
new file mode 100644
index 0000000000..275726781e
--- /dev/null
+++ b/share/ruby-build/picoruby-3.4.2
@@ -0,0 +1 @@
+install_package "picoruby-3.4.2" "https://github.com/picoruby/picoruby/releases/download/3.4.2/picoruby-3.4.2.tar.gz#75a7dded2b2dff443a80e3bb8075ccf2fe7b77282f8a8a69689fc700b51d61f3" picoruby