diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a63706d6..ab082246 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,6 +17,7 @@ jobs:
           - "3.0"
           - "3.1"
           - "3.2"
+          - "3.3"
 
     steps:
       - uses: actions/checkout@v4
diff --git a/README.md b/README.md
index b0c654c4..ff3dd48a 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ A Ruby library for [Thinreports](https://github.com/thinreports/thinreports).
 
 ### Supported Versions
 
-- Ruby 3.0, 3.1, 3.2
+- Ruby 3.0, 3.1, 3.2, 3.3
 - Prawn 2.4+
 
 ## Installation