diff --git a/.github/workflows/tests-and-linter.yml b/.github/workflows/tests-and-linter.yml
index 7e0b25f..65fc692 100644
--- a/.github/workflows/tests-and-linter.yml
+++ b/.github/workflows/tests-and-linter.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [2.5, 2.6, 2.7, '3.0']
+        ruby: [3.0, 3.1, 3.2]
 
     steps:
       - uses: actions/checkout@v2
diff --git a/.ruby-version b/.ruby-version
index ecd7ee5..818bd47 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.5.8
+3.0.6
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..d6608a7
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+ruby 3.0.6
diff --git a/README.md b/README.md
index a9e8530..eaf38db 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ Then, add the required and optional fields
 class User
   extend EzAttributes
 
-  # Here name and age are required, and email has a default value, so it is optional.
+  # Here, `name` and `age` are required, and `email` has a default value, so it is optional.
   attributes :name, :age, email: 'guest@user.com'
 end
 
@@ -74,7 +74,6 @@ u = User.new(name: 'Matz', age: 22)
 
 u.name
 # NoMethodError (undefined method `name' for #<User:0x000055bac152f130>)
-
 ```
 
 ## Development
diff --git a/ez_attributes.gemspec b/ez_attributes.gemspec
index 567abb0..1e29a66 100644
--- a/ez_attributes.gemspec
+++ b/ez_attributes.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description = "Easily define initializers with keyword args. It supports required and optional args."
   spec.homepage = "https://github.com/MatheusRich/ez_attributes.git"
   spec.license = "MIT"
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.5.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 3.0.0")
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage