diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 4ce109ae1..aa06f8634 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.18.0"
+  ".": "1.18.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c997e1ed1..7789cf4eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## 1.18.1 (2025-07-28)
+
+Full Changelog: [v1.18.0...v1.18.1](https://github.com/Increase/increase-ruby/compare/v1.18.0...v1.18.1)
+
+### Bug Fixes
+
+* **internal:** ensure sorbet test always runs serially ([3fadad9](https://github.com/Increase/increase-ruby/commit/3fadad9784a466584e85aefa67b223010d1d2437))
+
+
+### Chores
+
+* update contribute.md ([123999a](https://github.com/Increase/increase-ruby/commit/123999a695d9b5c4b895f6743c8657a29fc4ef5b))
+
 ## 1.18.0 (2025-07-23)
 
 Full Changelog: [v1.17.0...v1.18.0](https://github.com/Increase/increase-ruby/compare/v1.17.0...v1.18.0)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 11dc1f331..21ecbf966 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -78,7 +78,7 @@ $ bundle exec rake test
 
 ## Linting and formatting
 
-This repository uses [rubocop](https://github.com/rubocop/rubocop) for linting and formatting of `*.rb` and `*.rbi` files. [syntax_tree](https://github.com/ruby-syntax-tree/syntax_tree) is used for formatting `*.rbs` files.
+This repository uses [rubocop](https://github.com/rubocop/rubocop) for linting and formatting of `*.rb` files; And [syntax_tree](https://github.com/ruby-syntax-tree/syntax_tree) is used for formatting of both `*.rbi` and `*.rbs` files.
 
 There are two separate type checkers supported by this library: [sorbet](https://github.com/sorbet/sorbet) and [steep](https://github.com/soutaro/steep) are used for verifying `*.rbi` and `*.rbs` files respectively.
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 80b2667a9..84caab3d9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    increase (1.18.0)
+    increase (1.18.1)
       connection_pool
 
 GEM
diff --git a/README.md b/README.md
index 3f534cca1..8337a04f0 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ To use this gem, install via Bundler by adding the following to your application
 <!-- x-release-please-start-version -->
 
 ```ruby
-gem "increase", "~> 1.18.0"
+gem "increase", "~> 1.18.1"
 ```
 
 <!-- x-release-please-end -->
diff --git a/lib/increase/version.rb b/lib/increase/version.rb
index 606ea27a3..40c2d0ce9 100644
--- a/lib/increase/version.rb
+++ b/lib/increase/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Increase
-  VERSION = "1.18.0"
+  VERSION = "1.18.1"
 end
diff --git a/test/increase/internal/sorbet_runtime_support_test.rb b/test/increase/internal/sorbet_runtime_support_test.rb
index f1ca3c700..fe7fd1ff9 100644
--- a/test/increase/internal/sorbet_runtime_support_test.rb
+++ b/test/increase/internal/sorbet_runtime_support_test.rb
@@ -3,6 +3,8 @@
 require_relative "../test_helper"
 
 class Increase::Test::SorbetRuntimeSupportTest < Minitest::Test
+  extend Minitest::Serial
+
   i_suck_and_my_tests_are_order_dependent!
 
   module E