diff --git a/inventory/group_vars/buildvm-ppc64 b/inventory/group_vars/buildvm-ppc64
index 0091a0c762..14cedbf3cf 100644
--- a/inventory/group_vars/buildvm-ppc64
+++ b/inventory/group_vars/buildvm-ppc64
@@ -1,12 +1,12 @@
 ---
 # common items for the buildvm-* koji builders
 volgroup: /dev/vg_guests
-lvm_size: 150000
+lvm_size: 145000
 mem_size: 10240
 max_mem_size: "{{ mem_size }}"
 num_cpus: 4
-ks_url: http://10.5.126.23/repo/rhel/ks/buildvm-fedora-26-ppc64
-ks_repo: http://10.5.126.23/pub/fedora-secondary/releases/26/Server/ppc64/os/
+ks_url: http://10.5.126.23/repo/rhel/ks/buildvm-fedora-27-ppc64
+ks_repo: http://10.5.126.23/pub/fedora-secondary/releases/27/Server/ppc64/os/
 nm: 255.255.255.0
 gw: 10.5.129.254
 dns: 10.5.126.21
diff --git a/inventory/group_vars/buildvm-ppc64le b/inventory/group_vars/buildvm-ppc64le
index a7459bbbe7..375cf41cba 100644
--- a/inventory/group_vars/buildvm-ppc64le
+++ b/inventory/group_vars/buildvm-ppc64le
@@ -1,12 +1,12 @@
 ---
 # common items for the buildvm-* koji builders
 volgroup: /dev/vg_guests
-lvm_size: 150000
+lvm_size: 145000
 mem_size: 10240
 max_mem_size: "{{ mem_size }}"
 num_cpus: 4
-ks_url: http://10.5.126.23/repo/rhel/ks/buildvm-fedora-26-ppc64le
-ks_repo: http://10.5.126.23/pub/fedora-secondary/releases/26/Server/ppc64le/os/
+ks_url: http://10.5.126.23/repo/rhel/ks/buildvm-fedora-27-ppc64le
+ks_repo: http://10.5.126.23/pub/fedora-secondary/releases/27/Server/ppc64le/os/
 nm: 255.255.255.0
 gw: 10.5.129.254
 dns: 10.5.126.21