diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b27f1da45b74bbd6d63b4ae71563d8f01e49ffd9..9f85152658787a0d0002e8edd9beb5500856577f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -70,6 +70,7 @@ trigger biotracker/biotracker:
 trigger biotracker/backgroundsubtraction_tracker:
   stage: trigger
   only:
-    - master
+    - snapshot_20210303
   trigger:
     project: bioroboticslab/biotracker/backgroundsubtraction_tracker
+    branch: snapshot_20210303
diff --git a/ci/prepare.py b/ci/prepare.py
index 1f684e424271f0117b30c3b43c0ae5789d34800b..48a67c4ed73fb73a431c3d1de7f79e1c82e4e4cc 100755
--- a/ci/prepare.py
+++ b/ci/prepare.py
@@ -56,5 +56,5 @@ if __name__ == "__main__":
     for name, project, job in [
         ("biotracker-interfaces", "bioroboticslab/biotracker/interfaces", job_stem),
     ]:
-        with fetch_artifacts(project, "master", job) as artifacts:
+        with fetch_artifacts(project, "snapshot_20210303", job) as artifacts:
             extract_cmake_package(artifacts, name)