Hi Uttam, you'll only be able to upgrade if you have a valid software maintenance. To check if software maintenance is current for your license, navigate to Cog icon > Licensing and make sure the license support period has not expired. If your support period has expired, follow the prompts to renew your license and reapply it before upgrading.
For more information, you can read Bitbucket Server Upgrade Guide.
Let us know if that was your case or if you need further assistance!
Bitbucket Pipelines helps me manage and automate a number of serverless deployments to AWS Lambda and this is how I do it. I'm building Node.js Lambda functions using node-lambda ...
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