lib/generators/dockerfile_generator.rb in dockerfile-rails-1.0.12 vs lib/generators/dockerfile_generator.rb in dockerfile-rails-1.0.13

@@ -258,14 +258,14 @@
 
       # module build process depends on Python, and debian changed
       # how python is installed with the bullseye release.  Below
       # is based on debian release included with the Ruby images on
       # Dockerhub.
-      case Gem.ruby_version
+      case RUBY_VERSION
       when /^2.7/
-        bullseye = ruby_version >= "2.7.4"
+        bullseye = RUBY_VERSION >= "2.7.4"
       when /^3.0/
-        bullseye = ruby_version >= "3.0.2"
+        bullseye = RUBY_VERSION >= "3.0.2"
       else
         bullseye = true
       end
 
       if bullseye