diff --git a/core/base/Dockerfile b/core/base/Dockerfile
index 3a5e0b41..4317fad6 100644
--- a/core/base/Dockerfile
+++ b/core/base/Dockerfile
@@ -3,7 +3,7 @@
 # base system image (intermediate)
 # Note when updating the alpine tag, first manually run the workflow .github/workflows/mirror.yml.
 # Just run the workflow with the tag that must be synchronised.
-ARG DISTRO=ghcr.io/mailu/alpine:3.19.1
+ARG DISTRO=ghcr.io/mailu/alpine:3.20
 FROM $DISTRO as system
 
 ENV TZ=Etc/UTC LANG=C.UTF-8
diff --git a/core/dovecot/Dockerfile b/core/dovecot/Dockerfile
index 25eb9263..72753e1e 100644
--- a/core/dovecot/Dockerfile
+++ b/core/dovecot/Dockerfile
@@ -7,7 +7,6 @@ ARG VERSION
 LABEL version=$VERSION
 
 RUN set -euxo pipefail \
-  ; echo -e 'http://dl-cdn.alpinelinux.org/alpine/edge/main\nhttp://dl-cdn.alpinelinux.org/alpine/edge/testing\nhttp://dl-cdn.alpinelinux.org/alpine/edge/community' >> /etc/apk/repositories \
   ; apk add --no-cache 'dovecot<2.4' dovecot-lmtpd dovecot-pigeonhole-plugin dovecot-pop3d dovecot-submissiond rspamd-client dovecot-fts-flatcurve \
   ; mkdir /var/lib/dovecot
 
diff --git a/towncrier/newsfragments/3277.bugfix b/towncrier/newsfragments/3277.bugfix
new file mode 100644
index 00000000..0120a32c
--- /dev/null
+++ b/towncrier/newsfragments/3277.bugfix
@@ -0,0 +1 @@
+Switch to alpine 3.20, remove a dependency on edge for dovecot