diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7cc5019d..67dd5088 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -23,6 +23,7 @@ jobs:
           - "3.1"
           - "3.2"
           - "3.3"
+          - "3.4"
           - "jruby-9.4"
           - "truffleruby"
     steps:
diff --git a/docker-compose.yml b/docker-compose.yml
index 11f93ba2..a8ecfd89 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -78,6 +78,20 @@ services:
       - .:/code
     working_dir: /code
 
+  ci-3.4:
+    image: ruby:3.4
+    entrypoint: /code/ci-run.sh
+    environment:
+      INTEGRATION: openldap
+      INTEGRATION_HOST: ldap.example.org
+    depends_on:
+      - openldap
+    networks:
+      integration_test_network:
+    volumes:
+      - .:/code
+    working_dir: /code
+
   # https://github.com/flavorjones/truffleruby/pkgs/container/truffleruby
   ci-truffleruby:
     image: ghcr.io/flavorjones/truffleruby:stable