diff --git a/diffux_ci.gemspec b/diffux_ci.gemspec
index 3ae6113..f1ddb48 100644
--- a/diffux_ci.gemspec
+++ b/diffux_ci.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
   s.files         = Dir['lib/**/*']
   s.add_runtime_dependency 'diffux-core', '~> 0.0', '>= 0.0.2'
   s.add_runtime_dependency 'oily_png', '~> 1.1'
-  s.add_runtime_dependency 'selenium-webdriver', '~> 2.44', '>= 2.44.0'
+  s.add_runtime_dependency 'selenium-webdriver', '~> 2.53', '>= 2.53.0'
   s.add_runtime_dependency 'thin', '~> 1.6', '>= 1.6.3'
   s.add_runtime_dependency 'sinatra', '~> 1.4', '>= 1.4.5'
   s.add_runtime_dependency 's3', '~> 0.3', '>= 0.3.22'
diff --git a/lib/diffux_ci/version.rb b/lib/diffux_ci/version.rb
index 1569d0f..8a0b2fa 100644
--- a/lib/diffux_ci/version.rb
+++ b/lib/diffux_ci/version.rb
@@ -1,4 +1,4 @@
 # Defines the gem version.
 module DiffuxCI
-  VERSION = '0.4.3'
+  VERSION = '0.4.4'
 end