diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index 28f9c0d..ad228d3 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -15,7 +15,7 @@ jobs:
         repo:
           - eumau/postfix
         tag:
-          - "3"
+          - "4"
     steps:
       -
         name: Set up QEMU
diff --git a/Dockerfile b/Dockerfile
index 2f6e2c7..7a4934c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM eumau/debian:bullseye-slim
+FROM eumau/debian:bookworm-slim
 LABEL maintainer "Mauro Torrez <mauro@mau.ro>"
 ARG DEBIAN_FRONTEND=noninteractive
 ENV LC_ALL C
diff --git a/postmap_all b/postmap_all
index 68fe2dd..a36bffc 100755
--- a/postmap_all
+++ b/postmap_all
@@ -13,4 +13,4 @@ postconf -h \
     virtual_mailbox_maps \
     | sed "s/,/\n/g" | sed "s/ /\n/g" | sort | uniq \
     | egrep '(hash):' \
-    | xargs -n1 postmap
+    | xargs -t -n1 postmap