diff --git a/homeassistant/components/upb/__init__.py b/homeassistant/components/upb/__init__.py
index ca4375d1232882..c9f3a2df10501c 100644
--- a/homeassistant/components/upb/__init__.py
+++ b/homeassistant/components/upb/__init__.py
@@ -1,5 +1,7 @@
 """Support the UPB PIM."""
 
+import logging
+
 import upb_lib
 
 from homeassistant.config_entries import ConfigEntry
@@ -14,6 +16,7 @@
     EVENT_UPB_SCENE_CHANGED,
 )
 
+_LOGGER = logging.getLogger(__name__)
 PLATFORMS = [Platform.LIGHT, Platform.SCENE]
 
 
@@ -63,3 +66,21 @@ async def async_unload_entry(hass: HomeAssistant, config_entry: ConfigEntry) ->
         upb.disconnect()
         hass.data[DOMAIN].pop(config_entry.entry_id)
     return unload_ok
+
+
+async def async_migrate_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Migrate entry."""
+
+    _LOGGER.debug("Migrating from version %s", entry.version)
+
+    if entry.version == 1:
+        # 1 -> 2: Unique ID from integer to string
+        if entry.minor_version == 1:
+            minor_version = 2
+            hass.config_entries.async_update_entry(
+                entry, unique_id=str(entry.unique_id), minor_version=minor_version
+            )
+
+    _LOGGER.debug("Migration successful")
+
+    return True
diff --git a/homeassistant/components/upb/config_flow.py b/homeassistant/components/upb/config_flow.py
index d9f111049fd909..788a0336d7300c 100644
--- a/homeassistant/components/upb/config_flow.py
+++ b/homeassistant/components/upb/config_flow.py
@@ -78,6 +78,7 @@ class UPBConfigFlow(ConfigFlow, domain=DOMAIN):
     """Handle a config flow for UPB PIM."""
 
     VERSION = 1
+    MINOR_VERSION = 2
 
     async def async_step_user(
         self, user_input: dict[str, Any] | None = None
@@ -98,7 +99,7 @@ async def async_step_user(
                 errors["base"] = "unknown"
 
             if "base" not in errors:
-                await self.async_set_unique_id(network_id)
+                await self.async_set_unique_id(str(network_id))
                 self._abort_if_unique_id_configured()
 
                 return self.async_create_entry(
diff --git a/tests/components/upb/test_init.py b/tests/components/upb/test_init.py
new file mode 100644
index 00000000000000..a7621ce65fe52c
--- /dev/null
+++ b/tests/components/upb/test_init.py
@@ -0,0 +1,25 @@
+"""The init tests for the UPB platform."""
+
+from unittest.mock import patch
+
+from homeassistant.components.upb.const import DOMAIN
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+
+
+async def test_migrate_entry_minor_version_1_2(hass: HomeAssistant) -> None:
+    """Test migrating a 1.1 config entry to 1.2."""
+    with patch("homeassistant.components.upb.async_setup_entry", return_value=True):
+        entry = MockConfigEntry(
+            domain=DOMAIN,
+            data={"protocol": "TCP", "address": "1.2.3.4", "file_path": "upb.upe"},
+            version=1,
+            minor_version=1,
+            unique_id=123456,
+        )
+        entry.add_to_hass(hass)
+        assert await hass.config_entries.async_setup(entry.entry_id)
+        assert entry.version == 1
+        assert entry.minor_version == 2
+        assert entry.unique_id == "123456"