diff --git a/.github/workflows/ros2-ci.yml b/.github/workflows/ros2-ci.yml
index 43b53820..fb806edb 100644
--- a/.github/workflows/ros2-ci.yml
+++ b/.github/workflows/ros2-ci.yml
@@ -16,6 +16,9 @@ jobs:
           - docker-image: "ubuntu:22.04"
             gz-version: "garden"
             ros-distro: "humble"
+          - docker-image: "ubuntu:22.04"
+            gz-version: "harmonic"
+            ros-distro: "humble"
           - docker-image: "ubuntu:22.04"
             gz-version: "fortress"
             ros-distro: "rolling"