diff --git a/.changeset/strong-insects-provide.md b/.changeset/strong-insects-provide.md
new file mode 100644
index 0000000000..432c4eaa76
--- /dev/null
+++ b/.changeset/strong-insects-provide.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-backend': patch
+---
+
+Filter out projects with missing `default_branch` from gitlab discovery.