diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e11c988..7aacf39 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        ruby: ['2.7', '3.2', '3.3']
+        ruby: ['2.7', '3.2', '3.3', '3.4']
     runs-on: ${{ matrix.os }}
 
     steps:
diff --git a/.github/workflows/cross-compile.yml b/.github/workflows/cross-compile.yml
index f62445e..176bde5 100644
--- a/.github/workflows/cross-compile.yml
+++ b/.github/workflows/cross-compile.yml
@@ -32,13 +32,13 @@ jobs:
 
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.3"
+          ruby-version: "3.4"
 
       - uses: oxidize-rb/actions/cross-gem@v1
         id: cross-gem
         with:
           platform: ${{ matrix.platform }}
-          ruby-versions: 2.7,3.0,${{ join(fromJSON(needs.ci-data.outputs.result).stable-ruby-versions) }}
+          ruby-versions: "2.7,3.0,3.1,3.2,3.3,3.4"
 
       - uses: actions/upload-artifact@v4
         with:
diff --git a/.ruby-version b/.ruby-version
index 15a2799..1809198 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.0
+3.4.0