diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 358dff3..96e386b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,11 +9,8 @@ jobs:
       matrix:
         ruby:
           # See comment comes from https://github.com/ruby/setup-ruby#matrix-of-ruby-versions
-          # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
-          - '3.0'
-          - 3.1
-          - 3.2
           - 3.3
+          - 3.4
           - head
     env:
       BUNDLE_GEMFILE: Gemfile
diff --git a/Gemfile.lock b/Gemfile.lock
index c48b2f7..deae245 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -50,4 +50,4 @@ DEPENDENCIES
   rspec
 
 BUNDLED WITH
-   2.5.23
+   4.0.15
diff --git a/code_manifest.gemspec b/code_manifest.gemspec
index 8c44820..004c6d0 100644
--- a/code_manifest.gemspec
+++ b/code_manifest.gemspec
@@ -11,7 +11,7 @@ Gem::Specification.new do |spec|
   spec.summary = "A code manifest"
   spec.description = "A code manifest"
   spec.homepage = "https://github.com/rubyatscale/code_manifest"
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.7")
+  spec.required_ruby_version = Gem::Requirement.new(">= 3.3")
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/rubyatscale/code_manifest"