diff --git a/8.1.Dockerfile b/8.1.Dockerfile
index c448a8b..30bed39 100644
--- a/8.1.Dockerfile
+++ b/8.1.Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.18
+FROM alpine:3.21
 
 LABEL maintainer="docker@stefan-van-essen.nl"
 
diff --git a/8.2.Dockerfile b/8.2.Dockerfile
index 419a344..fa02018 100644
--- a/8.2.Dockerfile
+++ b/8.2.Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.19
+FROM alpine:3.21
 
 LABEL maintainer="docker@stefan-van-essen.nl"
 
diff --git a/8.3.Dockerfile b/8.3.Dockerfile
index 475e16e..62b5a2c 100644
--- a/8.3.Dockerfile
+++ b/8.3.Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.19
+FROM alpine:3.21
 
 LABEL maintainer="docker@stefan-van-essen.nl"
 
diff --git a/8.4-edge.Dockerfile b/8.4-edge.Dockerfile
index 89ec236..958eefe 100644
--- a/8.4-edge.Dockerfile
+++ b/8.4-edge.Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
 LABEL maintainer="docker@stefan-van-essen.nl"