git-version-bump.gemspec in git-version-bump-0.14.0 vs git-version-bump.gemspec in git-version-bump-0.15.0

@@ -4,10 +4,11 @@
 	s.name = "git-version-bump"
 
 	s.version = GVB.version
 	s.date    = GVB.date
 
-	s.platform = Gem::Platform::RUBY
+	s.platform              = Gem::Platform::RUBY
+	s.required_ruby_version = ">= 1.8.7"
 
 	s.homepage = "http://theshed.hezmatt.org/git-version-bump"
 	s.summary = "Manage your app version entirely via git tags"
 	s.authors = ["Matt Palmer"]