diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53b3ac11..87c7f1e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,10 @@ NOTE: Add new changes BELOW THIS COMMENT.
 
 - Go version has been updated to prevent the possibility of exploiting the Go vulnerabilities fixed in [1.24.2][go-1.24.2].
 
+### Changed
+
+- Alpine Linux version in `Dockerfile` has been updated to 3.21 ([#7588]).
+
 ### Deprecated
 
 - Node 20 support, Node 22 will be required in future releases.
@@ -38,6 +42,7 @@ NOTE: Add new changes BELOW THIS COMMENT.
 
 - Node 18 support.
 
+[#7588]: https://github.com/AdguardTeam/AdGuardHome/issues/7588
 [#7734]: https://github.com/AdguardTeam/AdGuardHome/issues/7734
 
 [go-1.24.2]: https://groups.google.com/g/golang-announce/c/Y2uBTVKjBQk
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 38198aa6..81331e05 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,12 +1,12 @@
 # A docker file for scripts/make/build-docker.sh.
 
-FROM alpine:3.18
+FROM alpine:3.21
 
 ARG BUILD_DATE
 ARG VERSION
 ARG VCS_REF
 
-LABEL\
+LABEL \
 	maintainer="AdGuard Team <devteam@adguard.com>" \
 	org.opencontainers.image.authors="AdGuard Team <devteam@adguard.com>" \
 	org.opencontainers.image.created=$BUILD_DATE \
@@ -30,8 +30,8 @@ ARG TARGETARCH
 ARG TARGETOS
 ARG TARGETVARIANT
 
-COPY --chown=nobody:nogroup\
-	./${DIST_DIR}/docker/AdGuardHome_${TARGETOS}_${TARGETARCH}_${TARGETVARIANT}\
+COPY --chown=nobody:nogroup \
+	./${DIST_DIR}/docker/AdGuardHome_${TARGETOS}_${TARGETARCH}_${TARGETVARIANT} \
 	/opt/adguardhome/AdGuardHome
 
 RUN setcap 'cap_net_bind_service=+eip' /opt/adguardhome/AdGuardHome
@@ -45,8 +45,15 @@ RUN setcap 'cap_net_bind_service=+eip' /opt/adguardhome/AdGuardHome
 # 3000   : TCP, UDP : HTTP(S) (alt, incl. HTTP/3)
 # 5443   : TCP, UDP : DNSCrypt (alt)
 # 6060   : TCP      : HTTP (pprof)
-EXPOSE 53/tcp 53/udp 67/udp 68/udp 80/tcp 443/tcp 443/udp 853/tcp\
-	853/udp 3000/tcp 3000/udp 5443/tcp 5443/udp 6060/tcp
+EXPOSE 53/tcp 53/udp \
+	67/udp \
+	68/udp \
+	80/tcp \
+	443/tcp 443/udp \
+	853/tcp 853/udp \
+	3000/tcp 3000/udp \
+	5443/tcp 5443/udp \
+	6060/tcp
 
 WORKDIR /opt/adguardhome/work
 
diff --git a/scripts/make/build-docker.sh b/scripts/make/build-docker.sh
index c998b3f7..2835f059 100644
--- a/scripts/make/build-docker.sh
+++ b/scripts/make/build-docker.sh
@@ -117,6 +117,8 @@ $sudo_cmd docker "$debug_flags" \
 	--build-arg DIST_DIR="$dist_dir" \
 	--build-arg VCS_REF="$commit" \
 	--build-arg VERSION="$version" \
+	--debug \
 	--output "$docker_output" \
 	--platform "$docker_platforms" \
+	--progress 'plain' \
 	$docker_version_tag $docker_channel_tag -f ./docker/Dockerfile .