I have used sp_WhoIsActive to find more info on blocking. Can you please advise what I can do to fix this blocking issue.
EXEC sp_WhoIsActive  @get_task_info = 2,  @get_additional_info = 1
--SPID 285 select query
<additional_info>
<text_size>-1</text_size>
<language>us_english</language>
<date_format>mdy</date_format>
<date_first>7</date_first>
<quoted_identifier>ON</quoted_identifier>
<arithabort>ON</arithabort>
<ansi_null_dflt_on>ON</ansi_null_dflt_on>
<ansi_defaults>OFF</ansi_defaults>
<ansi_warnings>ON</ansi_warnings>
<ansi_padding>ON</ansi_padding>
<ansi_nulls>ON</ansi_nulls>
<concat_null_yields_null>ON</concat_null_yields_null>
<transaction_isolation_level>ReadCommitted</transaction_isolation_level>
<lock_timeout>-1</lock_timeout>
<deadlock_priority>0</deadlock_priority>
<row_count>0</row_count>
<command_type>SELECT</command_type>
</additional_info>

***********************************************************
--spid 251 update query
<additional_info>
<text_size>-1</text_size>
<language>us_english</language>
<date_format>mdy</date_format>
<date_first>7</date_first>
<quoted_identifier>ON</quoted_identifier>
<arithabort>ON</arithabort>
<ansi_null_dflt_on>ON</ansi_null_dflt_on>
<ansi_defaults>OFF</ansi_defaults>
<ansi_warnings>ON</ansi_warnings>
<ansi_padding>ON</ansi_padding>
<ansi_nulls>ON</ansi_nulls>
<concat_null_yields_null>ON</concat_null_yields_null>
<transaction_isolation_level>ReadCommitted</transaction_isolation_level>
<lock_timeout>-1</lock_timeout>
<deadlock_priority>0</deadlock_priority>
<row_count>1</row_count>
<command_type>UPDATE</command_type>
<block_info>
  <lock_type>objectlock</lock_type>
  <database_name>EDW_DEV</database_name>
  <object_id>1540669032</object_id>
  <schema_name>dbo</schema_name>
  <object_name>DIM_BILL_INV_ITEM</object_name>
</block_info>
</additional_info>