diff --git a/cd.sh b/cd.sh
index a6696b6..9039eb9 100644
--- a/cd.sh
+++ b/cd.sh
@@ -35,7 +35,6 @@ cd_main () {
 cd_set_environment () {
     cd_step "Set environment"
     #
-    CD_CA_PACKAGE="ca-certificates"
     CD_DNS_FILE="/etc/resolv.conf"
     CD_GIT_PACKAGE="git"
     CD_PYTHON_COMMAND="python3"
@@ -44,6 +43,10 @@ cd_set_environment () {
         "debian")
             CD_PYTHON_PACKAGE="python3"
             CD_PYTHON_PACKAGES="/usr/lib/python3/dist-packages"
+            case "${CD_OS_VERSION}" in
+                "bookworm") echo "TODO" ;;
+                *) cd_error_os "CD_OS_VERSION" ;;
+            esac
         ;;
         "alma")
             case "${CD_OS_VERSION}" in
@@ -182,7 +185,11 @@ cd_install_packages_tools () {
 
 cd_install_ca () {
     cd_step "Install CA"
-    cd_install_package "${CD_CA_PACKAGE}"
+    case "${CD_OS_NAME}" in
+        "debian") cd_install_package "ca-certificates" ;;
+        "alma") echo "TODO" ;;
+        *) cd_error_os "cd_install_ca" ;;
+    esac
 }
 
 cd_copy_ca () {