diff --git a/ansible/hosts b/ansible/hosts
index 6a1783ea..0db38fbf 100644
--- a/ansible/hosts
+++ b/ansible/hosts
@@ -22,6 +22,7 @@ simtest ansible_host=10.9.25.80
 
 [obs_workers]
 build3-obsworker1 ansible_host=2a01:4f8:212:3762::1:2 obs_worker_instances=8 obs_worker_jobs=8
+build4-obsworker1 ansible_host=2a01:4f8:121:200a::1:2 obs_worker_instances=8 obs_worker_jobs=8
 lx2-1-obs-aarch64-1 ansible_host=2a02:8106:13:1e34:4e9:e7ff:fe97:fe92 obs_worker_instances=1 obs_worker_jobs=4
 
 # Need to have kvm inside lxc, see OS#5365
diff --git a/ansible/util/known_hosts b/ansible/util/known_hosts
index 05b30c88..cdb573b5 100644
--- a/ansible/util/known_hosts
+++ b/ansible/util/known_hosts
@@ -6,3 +6,4 @@
 10.9.25.60 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOAK6SQXmifMamE1VHL/1GmPkk6KhplzT20jSOwb8PyZ
 10.9.25.70 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILioWTUt6CyZTceSKqy09mtlNUif+ETKTF6whnWuIROx
 2a01:4f8:121:200a::1:3 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGafw2VdeZo4YNvbu8VEBjDrsCFL+ZSbHtvhspNIQ9PR
+2a01:4f8:121:200a::1:2 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFyp0daWkfsRHErCVCcP/FZmtiRvFNAsK2A5TlQ6Ja+P