diff --git a/cd.sh b/cd.sh
index e143c0d..a4cf213 100644
--- a/cd.sh
+++ b/cd.sh
@@ -87,19 +87,33 @@ Dir::Etc::SourceParts \"\";
     esac
 }
 
+function cd_set_https_verification_off {
+    cd_step "${FUNCNAME}"
+    case "${CD_OS_NAME}" in
+        'debian')
+            cd_write '/etc/apt/apt.conf.d/https' "\
+Acquire::https::Verify-Peer False;
+"
+        ;;
+        *) exit 1 ;;
+    esac
+}
+
+function cd_update_packages_catalog {
+    cd_step "${FUNCNAME}"
+    case "${CD_OS_NAME}" in
+        'debian') apt-get update ;;
+        *) exit 1 ;;
+    esac
+}
+
 function cd_main {
     cd_set_dns_resolving
     cd_set_packages_repositories
     cd_set_packages_configuration
+    cd_set_https_verification_off
+    cd_update_packages_catalog
 
-cd_step "disable package verification"
-echo -n "\
-Acquire::https::Verify-Peer False;
-" > '/etc/apt/apt.conf.d/https' \
-|| exit
-cd_step "update package catalog"
-apt-get update \
-|| exit
 cd_step "install CA certificates package"
 apt-get install --yes 'ca-certificates' \
 || exit