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package Parent;

...
sub new { bless {}, $_[0]; }

sub parent_version { $_[0]->SUPER::VERSION }

print "Parent version is ", Parent->VERSION, "\n"; # 1.23

print "Child version is ", Child->VERSION, "\n";  # 5.43

my $child = Child->new;

print "Child version: ",  $child->VERSION, "\n";            # 5.43
print "Parent version: ", $child->parent_version, "\n"; # 1.23

print "Child version: ",  $child->child_version, "\n"; # 5.43

print "Child version: ",  $child->VERSION, "\n";          # 5.43
print "Child version: ",  $child->child_version, "\n"; # 5.43