diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 9af1db8..a1d1ae6 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         go:
-          - '1.21'
+          - '1.23'
     steps:
       - uses: actions/checkout@v4
         with:
@@ -44,7 +44,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: '1.23'
       - name: Build
         run: go build ./...
       - name: Test
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 4808aca..49dfc6d 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: '1.21'
+          go-version: '1.23'
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 60449e1..d8acc96 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: '1.21'
+          go-version: '1.23'
           check-latest: true
 
       - name: Setup Node.js
diff --git a/Dockerfile b/Dockerfile
index 8a0627c..e75329f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,7 +12,7 @@ RUN yarn install --frozen-lockfile --non-interactive
 RUN yarn run build
 
 ### Build backend
-FROM golang:1.21-alpine3.19 as backend
+FROM golang:1.23-alpine3.20 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:3.19
+FROM alpine:3.20
 RUN apk --no-cache add tzdata
 WORKDIR /opt/inbucket
 RUN mkdir bin defaults ui