diff --git a/Dockerfile.linux.amd64 b/Dockerfile.linux.amd64
index 4887127..9c17b60 100644
--- a/Dockerfile.linux.amd64
+++ b/Dockerfile.linux.amd64
@@ -1,4 +1,4 @@
-FROM amd64/alpine:3.20 AS build
+FROM amd64/alpine:3.21 AS build
 RUN apk add --no-cache ca-certificates
 
 FROM scratch
diff --git a/Dockerfile.linux.arm b/Dockerfile.linux.arm
index c74fb55..93b6f04 100644
--- a/Dockerfile.linux.arm
+++ b/Dockerfile.linux.arm
@@ -1,4 +1,4 @@
-FROM arm32v6/alpine:3.20 AS build
+FROM arm32v6/alpine:3.21 AS build
 RUN apk add --no-cache ca-certificates
 
 FROM scratch
diff --git a/Dockerfile.linux.arm64 b/Dockerfile.linux.arm64
index d084360..f890cb8 100644
--- a/Dockerfile.linux.arm64
+++ b/Dockerfile.linux.arm64
@@ -1,4 +1,4 @@
-FROM arm64v8/alpine:3.20 AS build
+FROM arm64v8/alpine:3.21 AS build
 RUN apk add --no-cache ca-certificates
 
 FROM scratch