diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 89c2b5b2ae4..c4072df7bd9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,12 +24,15 @@ jobs:
             task: "--include-spec"
           - os: ubuntu-latest
             ruby: "3.2"
+            task: "--include-spec"
+          - os: ubuntu-latest
+            ruby: "3.3"
             task: "--include-spec --include-yardoc --include-build"
           - os: macos-latest
-            ruby: "3.2"
+            ruby: "3.3"
             task: "--include-spec"
           - os: windows-latest
-            ruby: "3.2"
+            ruby: "3.3"
             task: "--include-spec"
       fail-fast: false
     runs-on: ${{ matrix.os }}
diff --git a/google-apis-core/google-apis-core.gemspec b/google-apis-core/google-apis-core.gemspec
index 76ebcd70692..041ff3c6064 100644
--- a/google-apis-core/google-apis-core.gemspec
+++ b/google-apis-core/google-apis-core.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |gem|
   gem.files = Dir.glob("lib/**/*.rb") + Dir.glob("*.md") + [".yardopts"]
   gem.require_paths = ["lib"]
 
-  gem.required_ruby_version = '>= 2.5'
+  gem.required_ruby_version = '>= 2.7'
   gem.add_runtime_dependency "representable", "~> 3.0"
   gem.add_runtime_dependency "retriable", ">= 2.0", "< 4.a"
   gem.add_runtime_dependency "addressable", "~> 2.5", ">= 2.5.1"