diff --git a/backend/Dockerfile b/backend/Dockerfile
index 5839cb1..49c87aa 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,8 +1,11 @@
-# golang:1.24-alpine (2026-02-26)
-FROM golang:1.24-alpine@sha256:8bee1901f1e530bfb4a7850aa7a479d17ae3a18beb6e09064ed54cfd245b7191 AS builder
+# golang:1.25-alpine (2026-02-27)
+FROM golang:1.25-alpine@sha256:f6751d823c26342f9506c03797d2527668d095b0a15f1862cddb4d927a7a4ced AS builder
 
 RUN apk add --no-cache git make gcc musl-dev
 
+# golangci-lint v2.7.2 (2026-02-27)
+RUN CGO_ENABLED=0 go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@9f61b0f53f80672872fced07b6874397c3ed197b
+
 WORKDIR /src
 COPY go.mod go.sum ./
 RUN go mod download
@@ -11,8 +14,8 @@ COPY . .
 RUN make check
 RUN make build
 
-# alpine:3.21 (2026-02-26)
-FROM alpine:3.21@sha256:c3f8e73fdb79deaebaa2037150150191b9dcbfba68b4a46d70103204c53f4709
+# alpine:3.23 (2026-02-27)
+FROM alpine:3.23@sha256:25109184c71bdad752c8312a8623239686a9a2071e8825f20acb8f2198c3f659
 
 RUN apk add --no-cache ca-certificates
 COPY --from=builder /src/netwatch-server /usr/local/bin/netwatch-server