diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index a1d1ae6..70e3ffd 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         go:
-          - '1.23'
+          - '1.24'
     steps:
       - uses: actions/checkout@v4
         with:
@@ -44,7 +44,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: '1.24'
       - name: Build
         run: go build ./...
       - name: Test
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 49dfc6d..8ca474f 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: '1.24'
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d8acc96..8dbaa9e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -20,7 +20,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: '1.24'
           check-latest: true
 
       - name: Setup Node.js
diff --git a/Dockerfile b/Dockerfile
index c76cfed..c86b466 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@
 
 ### Build frontend
 # Due to no official elm compiler for arm; build frontend with amd64.
-FROM --platform=linux/amd64 node:20 as frontend
+FROM --platform=linux/amd64 node:20 AS frontend
 RUN npm install -g node-gyp
 WORKDIR /build
 COPY . .
@@ -12,7 +12,7 @@ RUN yarn install --frozen-lockfile --non-interactive
 RUN yarn run build
 
 ### Build backend
-FROM golang:1.23-alpine3.20 as backend
+FROM golang:1.24-alpine3.21 AS backend
 RUN apk add --no-cache --virtual .build-deps g++ git make
 WORKDIR /build
 COPY . .
@@ -23,7 +23,7 @@ RUN go build -o inbucket \
   -v ./cmd/inbucket
 
 ### Run in minimal image
-FROM alpine:3.20
+FROM alpine:3.21
 RUN apk --no-cache add tzdata
 WORKDIR /opt/inbucket
 RUN mkdir bin defaults ui
diff --git a/shell.nix b/shell.nix
index 8064d1a..7af7495 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,4 +1,6 @@
-{ pkgs ? import <nixpkgs> { } }:
+{
+  pkgs ? import <nixpkgs> { },
+}:
 let
   scripts = {
     # Quick test script.
@@ -22,7 +24,7 @@ pkgs.mkShell {
     elmPackages.elm-json
     elmPackages.elm-language-server
     elmPackages.elm-test
-    go_1_21
+    go_1_24
     golangci-lint
     golint
     gopls