diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 27aac96c..897194b5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [3.1, 3.2, 3.3, 3.4]
+        ruby: [3.2, 3.3, 3.4, 4.0]
         platform:
           - { os: ubuntu, target: linux-x64, extension: so }
           - { os: macos, target: macos-arm64, extension: bundle }
@@ -75,7 +75,7 @@ jobs:
       - name: setup ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4
+          ruby-version: 4.0
           bundler-cache: true
       - name: Lint
         run: just lint
@@ -88,7 +88,7 @@ jobs:
       - name: setup ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4
+          ruby-version: 4.0
           bundler-cache: true
       - name: Typecheck
         run: just tc
diff --git a/.github/workflows/publish-docs.yml b/.github/workflows/publish-docs.yml
index b4efda5b..1a8bfda4 100644
--- a/.github/workflows/publish-docs.yml
+++ b/.github/workflows/publish-docs.yml
@@ -36,7 +36,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4
+          ruby-version: 4.0
           bundler-cache: true
 
       - name: Generate docs
diff --git a/.rubocop.yml b/.rubocop.yml
index fce491ca..95c20f1b 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,6 +1,6 @@
 AllCops:
   NewCops: enable
-  TargetRubyVersion: 3.1
+  TargetRubyVersion: 3.2
   SuggestExtensions: false
   Exclude:
     - tree-sitter-parsers/**/*
diff --git a/lib/tree_sitter.rb b/lib/tree_sitter.rb
index 0e88e6dc..b1af1a5e 100644
--- a/lib/tree_sitter.rb
+++ b/lib/tree_sitter.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'set'
-
 begin
   RUBY_VERSION =~ /(\d+\.\d+)/
   require "tree_sitter/#{Regexp.last_match(1)}/tree_sitter"
diff --git a/sorbet/tapioca/require.rb b/sorbet/tapioca/require.rb
index 5749bdf2..f3b7073b 100644
--- a/sorbet/tapioca/require.rb
+++ b/sorbet/tapioca/require.rb
@@ -5,7 +5,6 @@
 require 'forwardable'
 require 'mkmf'
 require 'pathname'
-require 'set'
 require 'sorbet-runtime'
 require 'stringio'
 require 'tree_sitter/node'
diff --git a/tree_sitter.gemspec b/tree_sitter.gemspec
index f4a5fa9a..fb8d9f1d 100644
--- a/tree_sitter.gemspec
+++ b/tree_sitter.gemspec
@@ -6,7 +6,7 @@ $LOAD_PATH.unshift(lib) if !$LOAD_PATH.include?(lib)
 require 'tree_sitter/version'
 
 Gem::Specification.new do |spec|
-  spec.required_ruby_version = Gem::Requirement.new('>= 3.1.0')
+  spec.required_ruby_version = Gem::Requirement.new('>= 3.2.0')
 
   spec.authors       = ['Firas al-Khalil', 'Derek Stride']
   spec.email         = ['firasalkhalil@gmail.com', 'derek@stride.host']