Switch to Antelope images (#1227)

diff --git a/roles/defaults/vars/main.yml b/roles/defaults/vars/main.yml
index ca37422..6d60ce3 100644
--- a/roles/defaults/vars/main.yml
+++ b/roles/defaults/vars/main.yml
@@ -12,7 +12,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-atmosphere_release: main
+atmosphere_release: 2023.1
 
 _atmosphere_images:
   alertmanager: quay.io/prometheus/alertmanager:v0.27.0