diff --git a/.travis.yml b/.travis.yml
index b0abc6a..4f7f0b3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,10 +11,10 @@ gemfile:
   - gemfiles/sidekiq_5.gemfile
 
 rvm:
-  - 2.2.9
-  - 2.3.6
-  - 2.4.3
-  - 2.5.0
+  - 2.2.10
+  - 2.3.7
+  - 2.4.4
+  - 2.5.1
 
 notifications:
   email: false
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5989f7c..1afb8e1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.4.0 (July 18, 2018)
+
+- make lock container configurable (non breaking change) - in case you would like to something else than `Thread.current` - now you easily can
+
 ## 0.3.1 (March 3, 2018)
 
 - do not assume `ActiveSupport` is loaded / or old `Sidekiq` patches are present (add own symbolize keys logic)
diff --git a/lib/sidekiq/lock/version.rb b/lib/sidekiq/lock/version.rb
index 792d9b5..e0da5fc 100644
--- a/lib/sidekiq/lock/version.rb
+++ b/lib/sidekiq/lock/version.rb
@@ -1,5 +1,5 @@
 module Sidekiq
   module Lock
-    VERSION = '0.3.1'
+    VERSION = '0.4.0'
   end
 end