diff --git a/gpg/Dockerfile b/gpg/Dockerfile
index ccc7364..f595560 100644
--- a/gpg/Dockerfile
+++ b/gpg/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:20240315
+FROM alpine:20240329@sha256:e31c3b1cd47718260e1b6163af0a05b3c428dc01fa410baf72ca8b8076e22e72
 LABEL maintainer "Vlad Ghinea vlad@ghn.me"
 
 # Install packages
diff --git a/minidlna/Dockerfile b/minidlna/Dockerfile
index 0c43a62..542190f 100644
--- a/minidlna/Dockerfile
+++ b/minidlna/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:20240315
+FROM alpine:20240329@sha256:e31c3b1cd47718260e1b6163af0a05b3c428dc01fa410baf72ca8b8076e22e72
 LABEL maintainer "Vlad Ghinea vlad@ghn.me"
 
 ARG MINIDLNA_VERSION=1.3.3-r0
diff --git a/s3sync/Dockerfile b/s3sync/Dockerfile
index e42823f..ddc182c 100644
--- a/s3sync/Dockerfile
+++ b/s3sync/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:20240315
+FROM alpine:20240329@sha256:e31c3b1cd47718260e1b6163af0a05b3c428dc01fa410baf72ca8b8076e22e72
 LABEL maintainer "Vlad Ghinea vlad@ghn.me"
 
 # Environment