diff --git a/update_unstable.py b/update_unstable.py
index 4433fb6..f64d931 100755
--- a/update_unstable.py
+++ b/update_unstable.py
@@ -107,6 +107,7 @@ def update_package(hash_data, package_name, remote_name, obs_repository,
         run_osc(obs_repository, package_name)
         hash_data[obs_repository][remote_name] = remote_hash
         hash_data.save()
+        hash_data.to_json()
 
 
 def update_packages(cache_file, repo_mapping_file):