diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 919b5f08..6f208a17 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: [ ruby-3.0, ruby-3.1, ruby-3.2, ruby-3.3 ]
+        ruby: [ ruby-3.0, ruby-3.1, ruby-3.2, ruby-3.3, ruby-3.4 ]
         os: [ ubuntu-latest ]
 
     steps:
diff --git a/README.md b/README.md
index 900557fd..2252ca7a 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,7 @@ the following Ruby  versions:
 - Ruby 3.1
 - Ruby 3.2
 - Ruby 3.3
+- Ruby 3.4
 - JRuby 9.4
 
 If something doesn't work on one of these versions, it's a bug.