diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1c910fe..89ada60 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -23,7 +23,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.3, 2.4, 2.5]
+        ruby: [2.5]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Ruby
diff --git a/prawn-svg.gemspec b/prawn-svg.gemspec
index 765d80e..06fba2e 100644
--- a/prawn-svg.gemspec
+++ b/prawn-svg.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |gem|
   gem.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   gem.require_paths = ['lib']
 
-  gem.required_ruby_version = '>= 2.3.0'
+  gem.required_ruby_version = '>= 2.5.0'
 
   gem.add_runtime_dependency 'css_parser', '~> 1.6'
   gem.add_runtime_dependency 'matrix', '~> 0.4.2'