No installation of packages and upgrades possible

[Gamienator 0]

Hey everyone,

my pfSense 23.01 is currently complete stuck. When I'm trying to install a package I get:

WARNING: Current pkg repository has a new PHP major
         version. pfSense should be upgraded before
         installing any new package.

After some googling I tried different pkg commands and it looks that my pfSense can't resolve SSL Certificates now:

34948149248:error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:/var/jenkins/workspace/pfSense-Plus-snapshots-23_01-main/sources/FreeBSD-src-plus-RELENG_23_01/crypto/openssl/ssl/statem/statem_clnt.c:1921:
Certificate verification failed for /C=US/ST=Texas/L=Austin/O=Rubicon Communications, LLC (Netgate)/OU=pfSense Plus/CN=pfsense-plus-pkg01.atx.netgate.com
34948149248:error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:/var/jenkins/workspace/pfSense-Plus-snapshots-23_01-main/sources/FreeBSD-src-plus-RELENG_23_01/crypto/openssl/ssl/statem/statem_clnt.c:1921:
pkg-static: https://pfsense-plus-pkg01.atx.netgate.com/pfSense_plus-v23_05_amd64-pfSense_plus_v23_05/packagesite.txz: Authentication error
Unable to update repository pfSense
Error updating repositories!
ERROR: It was not possible to determine pfSense remote version
ERROR: It was not possible to determine pfSense-base remote version
ERROR: It was not possible to determine pfSense-kernel-pfSense remote version
Your system is up to date

Any idea how to solve this issue?