diff --git a/backend/charm/charmcraft.yaml b/backend/charm/charmcraft.yaml
index 3c0e4dd38..1a977b56f 100644
--- a/backend/charm/charmcraft.yaml
+++ b/backend/charm/charmcraft.yaml
@@ -119,7 +119,7 @@ resources:
   api-image:
     type: oci-image
     description: OCI image from GitHub Container Repository
-    upstream-source: ghcr.io/canonical/test_observer/api:main
+    upstream-source: ghcr.io/canonical/test_observer/api:latest
 
 containers:
   api:
diff --git a/frontend/charm/charmcraft.yaml b/frontend/charm/charmcraft.yaml
index 724af6a56..ce470d555 100644
--- a/frontend/charm/charmcraft.yaml
+++ b/frontend/charm/charmcraft.yaml
@@ -91,7 +91,7 @@ resources:
   frontend-image:
     type: oci-image
     description: OCI image for test-observer-frontend
-    upstream-source: ghcr.io/canonical/test_observer/frontend:main
+    upstream-source: ghcr.io/canonical/test_observer/frontend:latest
 
 containers:
   frontend: