Ruby 1.9.2 will not be supported any longer (see https://www.ruby-lang.org/en/news/2013/12/17/maintenance-of-1-8-7-and-1-9-2/)

.travis.yml

@@ -4,7 +4,7 @@ cache: bundler
 
 rvm:
   # - 1.8.7
-  - 1.9.2
+  # - 1.9.2
   - 1.9.3
   - 2.0.0
   - 2.1
@@ -24,14 +24,6 @@ matrix:
     - rvm: rbx-2.2.1
     - rvm: jruby-19mode
   exclude:
-    - rvm: 1.8.7
-      gemfile: gemfiles/rails_4.0.gemfile
-    - rvm: 1.8.7
-      gemfile: gemfiles/rails_4.1.gemfile
-    - rvm: 1.9.2
-      gemfile: gemfiles/rails_4.0.gemfile
-    - rvm: 1.9.2
-      gemfile: gemfiles/rails_4.1.gemfile
     - rvm: 1.9.3
       gemfile: gemfiles/rails_4.1.gemfile
     - rvm: jruby-19mode

aasm.gemspec

@@ -25,6 +25,8 @@ Gem::Specification.new do |s|
   # s.add_development_dependency 'mime-types', '~> 1.25' # needed by coveralls (>= 2.0 needs Ruby >=1.9.2)
   # s.add_development_dependency 'coveralls'
 
+  s.platform              = Gem::Platform::RUBY
+  # s.required_ruby_version = '>= 1.9.3'
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }