diff --git a/docker-bake.hcl b/docker-bake.hcl
index 983d49c..82f7471 100644
--- a/docker-bake.hcl
+++ b/docker-bake.hcl
@@ -327,71 +327,53 @@ target "osbuild-ci-latest" {
         )
 }
 
+variable "CENTOS_PACKAGES" {
+    default = <<EOF
+bash,
+bubblewrap,
+coreutils,
+cryptsetup,
+curl,
+dnf,
+dnf-plugins-core,
+dosfstools,
+e2fsprogs,
+findutils,
+git,
+glibc,
+iproute,
+lvm2,
+make,
+ostree,
+policycoreutils,
+python-rpm-macros,
+python3,
+python3-devel,
+python3-iniparse,
+python3-jsonschema,
+python3-librepo,
+python3-mako,
+python3-pip,
+python3-pyyaml,
+python3-rpm-generators,
+python3-rpm-macros,
+qemu-img,
+rpm,
+rpm-build,
+rpm-ostree,
+rpmdevtools,
+skopeo,
+systemd,
+systemd-container,
+tar,
+util-linux,
+fuse-overlayfs
+EOF
+}
+
 target "virtual-osbuild-ci-cXs" {
         args = {
-                OSB_DNF_PACKAGES = join(",", [
-                        "bash",
-                        //"btrfs-progs",         // not available in cXs
-                        "bubblewrap",
-                        "coreutils",
-                        "cryptsetup",
-                        "curl",
-                        "dnf",
-                        "dnf-plugins-core",
-                        "dosfstools",
-                        "e2fsprogs",
-                        "findutils",
-                        "git",
-                        "glibc",
-                        "iproute",
-                        "lvm2",
-                        "make",
-                        //"nbd",                 // not available in cXs
-                        //"nbd-cli",             // not available in cXs
-                        "ostree",
-                        //"pacman",              // not available in cXs
-                        "policycoreutils",
-                        //"pylint",              // not available in cXs
-                        "python-rpm-macros",
-                        "python3",               // install just the default version
-                        //"python3.6",
-                        //"python3.7",
-                        //"python3.8",
-                        //"python3.9",
-                        //"python3.10",
-                        //"python3.12",
-                        //"python3-autopep8",    // not available in cXs
-                        //"python3-boto3",       // not available in cXs
-                        //"python3-botocore",    // not available in cXs
-                        //"python3-docutils",    // not available in cXs
-                        "python3-devel",
-                        "python3-iniparse",
-                        //"python3-isort",       // not available in cXs
-                        "python3-jsonschema",
-                        "python3-librepo",
-                        "python3-mako",
-                        //"python3-mypy",        // not available in cXs
-                        "python3-pip",
-                        //"python3-pylint",      // not available in cXs
-                        //"python3-pytest",      // too old in cXs
-                        //"python3-pytest-cov",  // not available in cXs
-                        "python3-pyyaml",
-                        "python3-rpm-generators",
-                        "python3-rpm-macros",
-                        "qemu-img",
-                        //"qemu-system-x86",     // not available in cXs
-                        "rpm",
-                        "rpm-build",
-                        "rpm-ostree",
-                        "rpmdevtools",
-                        "skopeo",
-                        "systemd",
-                        "systemd-container",
-                        "tar",
-                        //"tox",                 // not available in cXs
-                        "util-linux",
-                        "fuse-overlayfs",
-                ]),
+                OSB_DNF_PACKAGES = chomp(CENTOS_PACKAGES),
                 OSB_PIP_PACKAGES = join(",", [
                         "autopep8",
                         "boto3",
@@ -413,24 +395,26 @@ target "virtual-osbuild-ci-cXs" {
 }
 
 target "osbuild-ci-c9s-latest" {
-        args = {
-                OSB_FROM = "quay.io/centos/centos:stream9",
-        }
         inherits = [
                 "virtual-osbuild-ci-cXs",
         ]
+        args = {
+                OSB_DNF_PACKAGES = format("%s, %s", chomp(CENTOS_PACKAGES), "python3-tomli")
+                OSB_FROM = "quay.io/centos/centos:stream9",
+        }
         tags = concat(
                 mirror("osbuild-ci-c9s", "latest", "", OSB_UNIQUEID),
         )
 }
 
 target "osbuild-ci-c10s-latest" {
-        args = {
-                OSB_FROM = "quay.io/centos/centos:stream10-development",
-        }
         inherits = [
                 "virtual-osbuild-ci-cXs",
         ]
+        args = {
+                OSB_DNF_PACKAGES = format("%s, %s", chomp(CENTOS_PACKAGES), "python3-tomli-w")
+                OSB_FROM = "quay.io/centos/centos:stream10-development",
+        }
         tags = concat(
                 mirror("osbuild-ci-c10s", "latest", "", OSB_UNIQUEID),
         )