diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 079ee92be..be7635cf9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -312,7 +312,7 @@ jobs:
       - run: pytest -vv tests/integration/workflows/python_uv
 
   ruby-integration:
-    name: ${{ matrix.os }} / ${{ matrix.python }} / ruby
+    name: ${{ matrix.os }} / ${{ matrix.python }} / ruby ${{ matrix.ruby }}
     if: github.repository_owner == 'aws'
     runs-on: ${{ matrix.os }}
     strategy:
@@ -323,6 +323,9 @@ jobs:
           - windows-latest
         python:
           - "3.13"
+        ruby:
+          - "3.2"
+          - "4.0"
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
@@ -330,7 +333,7 @@ jobs:
           python-version: ${{ matrix.python }}
       - uses: ruby/setup-ruby@4dc28cf14d77b0afa6832d9765ac422dbf0dfedd # v1
         with:
-          ruby-version: "3.2"
+          ruby-version: ${{ matrix.ruby }}
       - run: make init
       - run: pytest -vv tests/integration/workflows/ruby_bundler
 
diff --git a/aws_lambda_builders/supported_runtimes.py b/aws_lambda_builders/supported_runtimes.py
index 9ccb832bf..956072ea3 100644
--- a/aws_lambda_builders/supported_runtimes.py
+++ b/aws_lambda_builders/supported_runtimes.py
@@ -32,6 +32,7 @@
     "ruby3.2",
     "ruby3.3",
     "ruby3.4",
+    "ruby4.0",
 ]
 
 # Java runtimes
diff --git a/tests/integration/workflows/ruby_bundler/test_ruby.py b/tests/integration/workflows/ruby_bundler/test_ruby.py
index ce81a8aca..9d84f0be5 100644
--- a/tests/integration/workflows/ruby_bundler/test_ruby.py
+++ b/tests/integration/workflows/ruby_bundler/test_ruby.py
@@ -21,6 +21,7 @@
         ("ruby3.2",),
         ("ruby3.3",),
         ("ruby3.4",),
+        ("ruby4.0",),
     ],
 )
 class TestRubyWorkflow(TestCase):