Sharepoint Version upgrade details
First Check which build is available in farm?
Go to Central Administration > System Settings > Manage servers in your farm (/_admin/FarmServers.aspx)
Open Windows PowerShell: (get-spfarm).buildversion
To see which build your products are, go to Central Administration > Upgrade and Migration > Check Product and patch installation status. (/_admin/PatchStatus.aspx)
To see which build your databases are, go to Central Administration > Upgrade and Migration > Review database status (/_admin/DatabaseStatus.aspx)
Open below link
If your current build number is not matching with latest one from above link, then download the latest updates and install.