diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bb126e3..37907e7 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ 2.6, 2.7, "3.0", 3.1, 3.2, 3.3 ]
+        ruby: [ 2.6, 2.7, "3.0", 3.1, 3.2, 3.3, 3.4 ]
     steps:
       - uses: actions/checkout@v3
 
diff --git a/Gemfile b/Gemfile
index afe357a..4168265 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,5 +3,10 @@ source 'https://rubygems.org'
 # Specify your gem's dependencies in fcmpush.gemspec
 gemspec
 
+if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.4')
+  gem 'bigdecimal'
+  gem 'drb'
+end
+
 gem 'activesupport', '< 7.0'
 gem 'pry-byebug'
diff --git a/fcmpush.gemspec b/fcmpush.gemspec
index fc6f2a7..2dcd3d1 100644
--- a/fcmpush.gemspec
+++ b/fcmpush.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '>= 2.6', '< 3.4'
+  spec.required_ruby_version = '>= 2.6', '< 3.5'
 
   spec.add_dependency 'google-apis-identitytoolkit_v3'
   spec.add_dependency 'net-http-persistent', '~> 4.0.1'