diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6192a642..15ea9c83 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -24,6 +24,7 @@ jobs:
           - "2.7"
           - "3.0"
           - "jruby-9.2"
+          - "truffleruby-21.0.0"
     steps:
     - uses: actions/checkout@v2
     - name: Run tests with Ruby ${{ matrix.ruby }}
diff --git a/docker-compose.yml b/docker-compose.yml
index 1fc208cd..88a1cfd9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -79,6 +79,20 @@ services:
     volumes:
       - .:/code
     working_dir: /code
+  
+  ci-truffleruby-21.0.0:
+    image: flavorjones/truffleruby:21.0.0
+    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
 
   ci-jruby-9.2:
     image: jruby:9.2