diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index e9a90ef..b3711a3 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -15,7 +15,7 @@ jobs:
         repo:
           - "eumau/dovecot"
         tag:
-          - "3"
+          - "4"
     steps:
       -
         name: Set up QEMU
diff --git a/Dockerfile b/Dockerfile
index 5f8afab..aaad852 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