diff --git a/.rubocop.yml b/.rubocop.yml
index e3462a7..7b4bdb2 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 2.6
+  TargetRubyVersion: 3.2
 
 Style/StringLiterals:
   Enabled: true
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..c23af94
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+ruby 3.2.0
diff --git a/nostr.gemspec b/nostr.gemspec
index 1b7aaa5..b78edd2 100644
--- a/nostr.gemspec
+++ b/nostr.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description = "Client and relay implementation of the Nostr protocol."
   spec.homepage = "https://github.com/wilsonsilva/nostr"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 2.6.0"
+  spec.required_ruby_version = ">= 3.2.0"
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/wilsonsilva/nostr"