JRuby requires a working JVM. It is recommended to have Java 11 or higher (latest versions like JRuby 10 target Java 21 ).
Use 64-bit (x64) installers for modern Windows 10/11 systems. Step-by-Step Installation Guide Option 1: Using the Windows Installer (Recommended) download jruby for windows
Complete the wizard and restart any open command prompts. Option 2: Manual Installation via ZIP JRuby requires a working JVM
Navigate to the official downloads page and select the Windows Executable (standard or x64). download jruby for windows