diff --git a/cd.sh b/cd.sh
index c8b6d53..b7c7e02 100644
--- a/cd.sh
+++ b/cd.sh
@@ -92,7 +92,8 @@ skip_if_unavailable=False
             CD_OS_REPO="${CD_DEFAULT_REPO_DEBIAN}"
             [ "${CD_REPO_DEBIAN}" ] && CD_OS_REPO="${CD_REPO_DEBIAN}"
             case "${CD_OS_VERSION}" in
-                "bookworm"|"bullseye") cd_nop ;;
+                "bookworm") CD_PYTHON_COMMAND="python3.11" ;;
+                "bullseye") CD_PYTHON_COMMAND="python3.9" ;;
                 *) cd_error_os "CD_OS_VERSION" ;;
             esac
             CD_CA_ROOT="/usr/local/share/ca-certificates"
@@ -112,7 +113,6 @@ Dir::Etc::SourceParts \"\";
 "
             CD_PM_HTTPS_PATH="/etc/apt/apt.conf.d/https"
             CD_PM_HTTPS_TEXT="Acquire::https::Verify-Peer False;"
-            CD_PYTHON_COMMAND="python3"
             CD_PYTHON_PACKAGE="python3"
             CD_PYTHON_PACKAGES="/usr/lib/python3/dist-packages"
         ;;