diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a46c096..14db801 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - '3.2.0'
+          - '3.3.0'
 
     steps:
     - uses: actions/checkout@v3
diff --git a/.rubocop.yml b/.rubocop.yml
index 4e57df6..da083ed 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -5,7 +5,7 @@ require:
   - rubocop-rspec
 
 AllCops:
-  TargetRubyVersion: 3.2
+  TargetRubyVersion: 3.3
   DisplayCopNames: true
   NewCops: enable
 
diff --git a/.tool-versions b/.tool-versions
index 98fa67a..869046c 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-ruby 3.2.2
+ruby 3.3.0
 bun 1.0.11
diff --git a/nostr.gemspec b/nostr.gemspec
index 6acdb6a..9e5dae7 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://nostr-ruby.com/'
   spec.license = 'MIT'
-  spec.required_ruby_version = '>= 3.2.0'
+  spec.required_ruby_version = '>= 3.3.0'
   spec.metadata['rubygems_mfa_required'] = 'true'
 
   spec.metadata['homepage_uri'] = spec.homepage
diff --git a/spec/nostr_spec.rb b/spec/nostr_spec.rb
index 9b59ba1..534a35e 100644
--- a/spec/nostr_spec.rb
+++ b/spec/nostr_spec.rb
@@ -2,6 +2,6 @@
 
 RSpec.describe Nostr do
   it 'has a version number' do
-    expect(Nostr::VERSION).not_to be_nil
+    expect(described_class::VERSION).not_to be_nil
   end
 end