Can’t upgrade, memory allocation problem

When I try to automatically upgrade, which has worked consistently in the past, I get the following message:

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 2516357 bytes) in /home3/escondi2/public_html/escondidodems/wp/wp-includes/http.php on line 1363

Can anyone advise me what to do about this? Thanks!