diff --git a/taskcluster/gecko_taskgraph/actions/merge_automation.py b/taskcluster/gecko_taskgraph/actions/merge_automation.py
index ad3088b0dc6d..7efe64faa62e 100644
--- a/taskcluster/gecko_taskgraph/actions/merge_automation.py
+++ b/taskcluster/gecko_taskgraph/actions/merge_automation.py
@@ -36,6 +36,14 @@ def is_release_promotion_available(parameters):
                 "enum": sorted(graph_config["merge-automation"]["behaviors"].keys()),
                 "default": "REPLACE ME",
             },
+            "from-repo": {
+                "type": "string",
+                "description": "The URI of the source repository",
+            },
+            "to-repo": {
+                "type": "string",
+                "description": "The push URI of the target repository",
+            },
             "from-branch": {
                 "type": "string",
                 "description": "The fx head of the source, such as central",
@@ -63,7 +71,9 @@ def merge_automation_action(parameters, graph_config, input, task_group_id, task
     }
 
     for field in [
+        "from-repo",
         "from-branch",
+        "to-repo",
         "to-branch",
         "fetch-version-from",
     ]:
diff --git a/taskcluster/gecko_taskgraph/config.py b/taskcluster/gecko_taskgraph/config.py
index 08b37baa58ec..a9a4f6928396 100644
--- a/taskcluster/gecko_taskgraph/config.py
+++ b/taskcluster/gecko_taskgraph/config.py
@@ -50,6 +50,8 @@ graph_config_schema = Schema(
                 str: {
                     Optional("from-branch"): str,
                     Required("to-branch"): str,
+                    Optional("from-repo"): str,
+                    Optional("to-repo"): str,
                     Required("version-files"): [
                         {
                             Required("filename"): str,
diff --git a/taskcluster/gecko_taskgraph/transforms/merge_automation.py b/taskcluster/gecko_taskgraph/transforms/merge_automation.py
index 1e1c7d8b0951..3a4ed8a3cfec 100644
--- a/taskcluster/gecko_taskgraph/transforms/merge_automation.py
+++ b/taskcluster/gecko_taskgraph/transforms/merge_automation.py
@@ -67,7 +67,9 @@ def add_payload_config(config, tasks):
 
         # Override defaults, useful for testing.
         for field in [
+            "from-repo",
             "from-branch",
+            "to-repo",
             "to-branch",
             "fetch-version-from",
             "lando-repo",