diff --git a/.changeset/funky-masks-arrive.md b/.changeset/funky-masks-arrive.md
new file mode 100644
index 0000000..1634e65
--- /dev/null
+++ b/.changeset/funky-masks-arrive.md
@@ -0,0 +1,5 @@
+---
+"gitlab-dynamic-pipelines": patch
+---
+
+Allow trigger branch to be optional
diff --git a/src/Job.ts b/src/Job.ts
index 76fea14..95e70c8 100644
--- a/src/Job.ts
+++ b/src/Job.ts
@@ -119,7 +119,7 @@ type TriggerConfig = (
     }
   | {
       project: string;
-      branch: string;
+      branch?: string;
     }
 ) & {
   forward?: { yaml_variables?: boolean; pipeline_variables?: boolean };