diff --git a/.github/workflows/ubuntu-test.yml b/.github/workflows/ubuntu-test.yml
index 3581989..417cc26 100644
--- a/.github/workflows/ubuntu-test.yml
+++ b/.github/workflows/ubuntu-test.yml
@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
-        ruby: ["2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "3.3"]
+        ruby: ["2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4"]
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/windows-test.yml b/.github/workflows/windows-test.yml
index c51d3e1..3bcf03f 100644
--- a/.github/workflows/windows-test.yml
+++ b/.github/workflows/windows-test.yml
@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
-        ruby: ["2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "3.3"]
+        ruby: ["2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4"]
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1