diff --git a/package.json b/package.json
index b982a9b71..a65ec78e6 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     },
     "default_api_branch": "5.4",
     "supported_es_branches": [
+      "5.5",
       "5.4",
       "5.3",
       "5.2",
@@ -35,8 +36,9 @@
       "0.90"
     ],
     "unstable_es_branches": [
-      "5.x",
-      "5.5",
+      "5.6",
+      "6.0",
+      "6.x",
       "master"
     ]
   },