diff --git a/.travis.yml b/.travis.yml
index b407c87..cf12a26 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,10 +25,3 @@ matrix:
     gemfile: gemfiles/rails_60.gemfile
 notifications:
   email: false
-
-# for 2.5.0 until 2.5.1 is released:
-#   https://github.com/travis-ci/travis-ci/issues/8978
-#   https://github.com/travis-ci/travis-ci/issues/8969#issuecomment-354135622
-before_install:
-  - gem update --system
-  - gem install bundler
diff --git a/telegram-bot.gemspec b/telegram-bot.gemspec
index fcb36b6..9aae4cf 100644
--- a/telegram-bot.gemspec
+++ b/telegram-bot.gemspec
@@ -26,6 +26,6 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'activesupport', '>= 4.0', '< 6.0'
   spec.add_dependency 'httpclient', '~> 2.7'
 
-  spec.add_development_dependency 'bundler', '~> 1.16'
+  spec.add_development_dependency 'bundler', '> 1.16'
   spec.add_development_dependency 'rake', '~> 10.0'
 end