diff --git a/.github/workflows/update-resource-gallery.yaml b/.github/workflows/update-resource-gallery.yaml
index ab1e9371..2351c2ca 100644
--- a/.github/workflows/update-resource-gallery.yaml
+++ b/.github/workflows/update-resource-gallery.yaml
@@ -95,10 +95,15 @@ jobs:
           resource_gallery_file = 'portal/resource_gallery.yaml'
 
           with open(submission_file, 'r') as file:
-              data = json.load(file)
+              new_data = json.load(file)
+
+          with open(resource_gallery_file, 'r') as yaml_file:
+              existing_data = yaml.load(yaml_file) or []
+
+          existing_data.append(new_data)
 
           with open(resource_gallery_file, 'w') as yaml_file:
-              yaml.dump(data, yaml_file)
+              yaml.dump(existing_data, yaml_file, default_flow_style=False)
 
       - name: Run pre-commit hooks
         run: |