diff --git a/clickhouse-activerecord.gemspec b/clickhouse-activerecord.gemspec
index 4de37018..7c3cd5c2 100644
--- a/clickhouse-activerecord.gemspec
+++ b/clickhouse-activerecord.gemspec
@@ -26,7 +26,6 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'bundler', '>= 1.13.4'
   spec.add_runtime_dependency 'activerecord', '>= 5.2'
 
-  spec.add_development_dependency 'bundler', '>= 1.15'
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rspec', '~> 3.4'
   spec.add_development_dependency 'pry', '~> 0.12'
diff --git a/lib/clickhouse-activerecord/version.rb b/lib/clickhouse-activerecord/version.rb
index 33b88240..88d6f954 100644
--- a/lib/clickhouse-activerecord/version.rb
+++ b/lib/clickhouse-activerecord/version.rb
@@ -1,3 +1,3 @@
 module ClickhouseActiverecord
-  VERSION = '0.5.15'
+  VERSION = '0.6.0'
 end