diff --git a/2.9/alpine/Dockerfile b/2.9/alpine/Dockerfile
index 3be62d6..f2d171c 100644
--- a/2.9/alpine/Dockerfile
+++ b/2.9/alpine/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
 RUN apk add --no-cache \
 	ca-certificates \
diff --git a/2.9/alpine/Dockerfile.base b/2.9/alpine/Dockerfile.base
index abf8b7c..f3eda1d 100644
--- a/2.9/alpine/Dockerfile.base
+++ b/2.9/alpine/Dockerfile.base
@@ -1 +1 @@
-FROM alpine:3.20
+FROM alpine:3.21