diff --git a/.github/workflows/protocol.yml b/.github/workflows/protocol.yml
index 7878ff872..755557039 100644
--- a/.github/workflows/protocol.yml
+++ b/.github/workflows/protocol.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["2.7", "3.0", "3.1", "3.2", "head", "debug"]
+        ruby-version: ["2.7", "3.0", "3.1", "3.2", "3.3", "head", "debug"]
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/ruby-macos.yaml b/.github/workflows/ruby-macos.yaml
index e13e52b6c..4b04e8647 100644
--- a/.github/workflows/ruby-macos.yaml
+++ b/.github/workflows/ruby-macos.yaml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['3.2', 'head']
+        ruby-version: ["3.2", "3.3", "head"]
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 4662ef6a7..dd76ced54 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["2.7", "3.0", "3.1", "3.2", "head", "debug"]
+        ruby-version: ["2.7", "3.0", "3.1", "3.2", "3.3", "head", "debug"]
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/test_test.yml b/.github/workflows/test_test.yml
index e65ded2bf..3123697fe 100644
--- a/.github/workflows/test_test.yml
+++ b/.github/workflows/test_test.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['3.0', '3.1', '3.2', 'head', 'debug']
+        ruby-version: ["3.0", "3.1", "3.2", "3.3", "head", "debug"]
 
     steps:
     - uses: actions/checkout@v4