diff --git a/Dockerfile b/Dockerfile
index 28f5e946a..fcf9c49b9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.2
-FROM alpine:3.20
+FROM alpine:3.21
 
 RUN apk add --no-cache --no-progress ca-certificates tzdata
 
diff --git a/docs/check.Dockerfile b/docs/check.Dockerfile
index 824a97081..a3c5fba6f 100644
--- a/docs/check.Dockerfile
+++ b/docs/check.Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
 RUN apk --no-cache --no-progress add \
     build-base \
diff --git a/docs/docs.Dockerfile b/docs/docs.Dockerfile
index 2ed4d0528..e15440a36 100644
--- a/docs/docs.Dockerfile
+++ b/docs/docs.Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
 ENV PATH="${PATH}:/venv/bin"