diff --git a/Dockerfile b/Dockerfile
index 7be38bfd7669..cb840c6106e1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@ ARG GOTESTSUM_VERSION=v1.9.0
 ARG DELVE_VERSION=v1.23.1
 
 ARG GO_VERSION=1.23
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 ARG XX_VERSION=1.6.1
 ARG BUILDKIT_DEBUG
 
diff --git a/frontend/dockerfile/cmd/dockerfile-frontend/Dockerfile b/frontend/dockerfile/cmd/dockerfile-frontend/Dockerfile
index e60aede7ef31..f5e86234f97c 100644
--- a/frontend/dockerfile/cmd/dockerfile-frontend/Dockerfile
+++ b/frontend/dockerfile/cmd/dockerfile-frontend/Dockerfile
@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile-upstream:master
 
 ARG GO_VERSION=1.23
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 ARG XX_VERSION=1.6.1
 
 # xx is a helper for cross-compilation
diff --git a/hack/dockerfiles/archutil.Dockerfile b/hack/dockerfiles/archutil.Dockerfile
index 114e86d474c9..38d329e05f1a 100644
--- a/hack/dockerfiles/archutil.Dockerfile
+++ b/hack/dockerfiles/archutil.Dockerfile
@@ -2,7 +2,7 @@
 # check=error=true
 
 ARG GO_VERSION=1.23
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 ARG DEBIAN_VERSION=trixie
 
 ARG BUILD_LOONG64=${TARGETPLATFORM#linux/amd64}
diff --git a/hack/dockerfiles/authors.Dockerfile b/hack/dockerfiles/authors.Dockerfile
index 86ec5d18a037..ab68f42b66e3 100644
--- a/hack/dockerfiles/authors.Dockerfile
+++ b/hack/dockerfiles/authors.Dockerfile
@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile-upstream:master
 
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 
 FROM alpine:${ALPINE_VERSION} AS gen
 RUN apk add --no-cache git
diff --git a/hack/dockerfiles/docs-dockerfile.Dockerfile b/hack/dockerfiles/docs-dockerfile.Dockerfile
index f939d262aebb..2d3d4bfdace8 100644
--- a/hack/dockerfiles/docs-dockerfile.Dockerfile
+++ b/hack/dockerfiles/docs-dockerfile.Dockerfile
@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 ARG GO_VERSION=1.23
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 
 FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS golatest
 
diff --git a/hack/dockerfiles/docs.Dockerfile b/hack/dockerfiles/docs.Dockerfile
index 7b7f8c22a3a4..338c3e11561b 100644
--- a/hack/dockerfiles/docs.Dockerfile
+++ b/hack/dockerfiles/docs.Dockerfile
@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 ARG GO_VERSION=1.23
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 
 FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS golatest
 
diff --git a/hack/dockerfiles/lint.Dockerfile b/hack/dockerfiles/lint.Dockerfile
index cd9c6100ff1a..94b7a8152de2 100644
--- a/hack/dockerfiles/lint.Dockerfile
+++ b/hack/dockerfiles/lint.Dockerfile
@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile-upstream:master
 
 ARG GO_VERSION=1.23
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 ARG XX_VERSION=1.6.1
 ARG PROTOLINT_VERSION=0.50.5
 ARG GOLANGCI_LINT_VERSION=1.61.0
diff --git a/hack/dockerfiles/vendor.Dockerfile b/hack/dockerfiles/vendor.Dockerfile
index c57c6b99ed01..00ac4ac0f6db 100644
--- a/hack/dockerfiles/vendor.Dockerfile
+++ b/hack/dockerfiles/vendor.Dockerfile
@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile-upstream:master
 
 ARG GO_VERSION=1.23
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 ARG MODOUTDATED_VERSION=v0.9.0
 
 FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS base