diff --git a/.ruby-version b/.ruby-version
index a4dd9db..0aec50e 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.7.4
+3.1.4
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..306ab33
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+ruby 3.1.4
diff --git a/Appraisals b/Appraisals
index 32e1e98..3d589ab 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,7 +1,3 @@
-appraise "rails-6" do
-  gem "rails", "6.0.3.7"
-end
-
 appraise "rails-6-1" do
   gem "rails", "6.1.4"
 end
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 65dfebb..dc1c4da 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,16 @@
 
 _none_
 
+## 3.0.1 (2024-01-30)
+
+* Add `include_graphql_error` RSpec matcher
+
+## 3.0.0 (2024-01-30)
+
+**Changes**
+* **(Breaking)** Drop support for Rails 6.0
+* **(Breaking)** Drop support for Ruby 2.7
+
 ## 2.2.0 (2024-01-15)
 
 **Changes**
diff --git a/README.md b/README.md
index 222ecec..c8a5346 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ Help Nulogy applications be compliant with the [Standard on Error-handling in Gr
 Add this line to your application's Gemfile:
 
 ```ruby
-gem "nulogy_graphql_api", "2.1.0"
+gem "nulogy_graphql_api", "3.0.1"
 ```
 
 And then execute:
@@ -253,9 +253,7 @@ end
 
 #### Custom matchers
 
-These are the custom matchers available:
-
-`have_graphql_data` for checking the response `data`
+Use `have_graphql_data` for checking the response `data`.
 
 ```ruby
 expect(response).to have_graphql_data(
@@ -265,12 +263,20 @@ expect(response).to have_graphql_data(
 )
 ```
 
-`have_graphql_error` for checking the response `errors`
+Use `have_graphql_error` for matching exactly on the response `errors`. <br/>
+The match succeeds when the `errors` array contains a single entry with the specified message.
 
 ```ruby
 expect(response).to have_graphql_error("Error message")
 ```
 
+Use `include_graphql_error` for matching inclusively on the response `errors`. <br/>
+The match succeeds when the `errors` array includes an entry with the specified message.
+
+```ruby
+expect(response).to include_graphql_error("Error message")
+```
+
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
diff --git a/gemfiles/rails_6.gemfile b/gemfiles/rails_6.gemfile
deleted file mode 100644
index ab7af82..0000000
--- a/gemfiles/rails_6.gemfile
+++ /dev/null
@@ -1,7 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "rails", "6.0.3.7"
-
-gemspec path: "../"
diff --git a/lib/nulogy_graphql_api/rspec/graphql_matchers.rb b/lib/nulogy_graphql_api/rspec/graphql_matchers.rb
index 184b688..dc6c030 100644
--- a/lib/nulogy_graphql_api/rspec/graphql_matchers.rb
+++ b/lib/nulogy_graphql_api/rspec/graphql_matchers.rb
@@ -34,5 +34,13 @@ module GraphqlMatchers
         })
       end
     end
+
+    RSpec::Matchers.define :include_graphql_error do |message|
+      match do |actual_response|
+        expect(actual_response.fetch(:errors, nil)).to include(a_hash_including(
+          message: include(message)
+        ))
+      end
+    end
   end
 end
diff --git a/lib/nulogy_graphql_api/version.rb b/lib/nulogy_graphql_api/version.rb
index dbcbe6d..4e75de5 100644
--- a/lib/nulogy_graphql_api/version.rb
+++ b/lib/nulogy_graphql_api/version.rb
@@ -1,3 +1,3 @@
 module NulogyGraphqlApi
-  VERSION = "2.2.0"
+  VERSION = "3.0.1"
 end
diff --git a/nulogy_graphql_api.gemspec b/nulogy_graphql_api.gemspec
index 952c93a..1c7df0e 100644
--- a/nulogy_graphql_api.gemspec
+++ b/nulogy_graphql_api.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
     "rubygems_mfa_required" => "true"
   }
 
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.6.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 3.0.0")
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency "graphql", "~> 2"
   spec.add_dependency "graphql-schema_comparator", "~> 1.2"
-  spec.add_dependency "rails", ">= 6.0", "< 8.0"
+  spec.add_dependency "rails", ">= 6.1", "< 8.0"
   spec.add_dependency "rainbow", "~> 3.0"
 
   spec.add_development_dependency "appraisal", "~> 2.5"