diff --git a/images/openwisp_postfix/Dockerfile b/images/openwisp_postfix/Dockerfile
index bc340a28..c10bde01 100644
--- a/images/openwisp_postfix/Dockerfile
+++ b/images/openwisp_postfix/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.22
+FROM alpine:3.23
 
 WORKDIR /opt/openwisp/
 # hadolint ignore=DL3018