1.9.2 was not a minor version bump. Ruby indicates bug fix level changes with the patch level, so Ruby 1.9.1-p430 is compatible with the earlier 1.9.1-p429, bu

1.9.2 was not a minor version bump. Ruby indicates bug fix level changes with the patch level, so Ruby 1.9.1-p430 is compatible with the earlier 1.9.1-p429, but not entirely compatible with 1.9.2-p0.