diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 535bc42..4eea646 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ["2.7", "3.0", "3.1", "3.2"]
+        ruby-version: ["3.0", "3.1", "3.2"]
     permissions: write-all
     steps:
       - run: docker pull tapyrus/tapyrusd:v0.5.2
diff --git a/glueby.gemspec b/glueby.gemspec
index fa9e1f0..ab5c941 100644
--- a/glueby.gemspec
+++ b/glueby.gemspec
@@ -10,7 +10,7 @@ Gem::Specification.new do |spec|
   spec.description   = %q{A Ruby library of smart contracts that can be used on Tapyrus.}
   spec.homepage      = "https://github.com/chaintope/glueby"
   spec.license       = "MIT"
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.7.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 3.0.0")
 
 
   spec.metadata["homepage_uri"] = spec.homepage