Update XML node value into as lower case using T-SQL in SQL Server

I’ve a table with one XML data type column.
XML format as below

Table: RootTable

+----+------------------------------------------------------+
|Id  | Data                                                 |
+----+------------------------------------------------------+
|1   | <Root><Id>1</Id><SubRoot>Production</SubRoot></Root> |
+----+------------------------------------------------------+
|2   |  <Root><Id>1</Id><SubRoot>Test</SubRoot></Root>      |
+----+------------------------------------------------------+

I need to update XML as below,

+----+------------------------------------------------------+
|Id  | Data                                                 |
+----+------------------------------------------------------+
|1   | <Root><Id>1</Id><SubRoot>production</SubRoot></Root> |
+----+------------------------------------------------------+
|2   |  <Root><Id>1</Id><SubRoot>test</SubRoot></Root>      |
+----+------------------------------------------------------+

Here I need to update the SubRoot’s value all to lower case.
Kindly help me on how to update this using T-SQL in SQL Server.

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