diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9c824af..dd1f0a3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,18 @@ All user visible changes to this project will be documented in this file. This p
 
 
 
+## [0.17.3-r1] · 2024-12-11
+[0.17.3-r1]: /../../tree/0.17.3-r1
+
+[Diff](/../../compare/0.17.3-r0...0.17.3-r1)
+
+### Upgraded
+
+- [Alpine Linux] 3.21: <https://www.alpinelinux.org/posts/Alpine-3.21.0-released.html>
+
+
+
+
 ## [0.17.3-r0] · 2024-11-11
 [0.17.3-r0]: /../../tree/0.17.3-r0
 
diff --git a/Dockerfile b/Dockerfile
index 0ffbe8e..8fd72e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,10 +3,10 @@
 #
 
 # https://hub.docker.com/_/golang
-FROM golang:1.22-alpine3.20 AS dist
+FROM golang:1.22-alpine3.21 AS dist
 
 ARG restic_ver=0.17.3
-ARG build_rev=0
+ARG build_rev=1
 
 
 # Install build tools.
@@ -36,7 +36,7 @@ RUN cd /tmp/restic-* \
 #
 
 # https://hub.docker.com/_/alpine
-FROM alpine:3.20 AS runtime
+FROM alpine:3.21 AS runtime
 
 
 # Install restic runtime dependencies and upgrade existing packages.
diff --git a/README.md b/README.md
index feb10a0..97fbd47 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ restic Docker Image
 
 ## Supported tags and respective `Dockerfile` links
 
-- [`0.17.3-r0`, `0.17.3`, `0.17`, `latest`][201]
+- [`0.17.3-r1`, `0.17.3`, `0.17`, `latest`][201]