diff --git a/homeassistant/components/rainmachine/__init__.py b/homeassistant/components/rainmachine/__init__.py
index 5c3ff18f71c..730e288df02 100644
--- a/homeassistant/components/rainmachine/__init__.py
+++ b/homeassistant/components/rainmachine/__init__.py
@@ -507,7 +507,8 @@ async def async_migrate_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     # 1 -> 2: Update unique IDs to be consistent across platform (including removing
     # the silly removal of colons in the MAC address that was added originally):
     if version == 1:
-        version = entry.version = 2
+        version = 2
+        hass.config_entries.async_update_entry(entry, version=version)
 
         @callback
         def migrate_unique_id(entity_entry: er.RegistryEntry) -> dict[str, Any]: