diff --git a/jekyll-theme-chirpy.gemspec b/jekyll-theme-chirpy.gemspec
index 2c77572..a1b97cc 100644
--- a/jekyll-theme-chirpy.gemspec
+++ b/jekyll-theme-chirpy.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
     "plugin_type"       => "theme"
   }
 
-  spec.required_ruby_version = ">= 3.0"
+  spec.required_ruby_version = "~> 3.1"
 
   spec.add_runtime_dependency "jekyll", "~> 4.3"
   spec.add_runtime_dependency "jekyll-paginate", "~> 1.1"