kubernetes-sigs · k8s-ci-robot · Jan 27, 2024 · Jan 26, 2024
diff --git a/.github/workflows/apidiff.yml b/.github/workflows/apidiff.yml
@@ -19,7 +19,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: "~1.20"
+          go-version: "~1.21"
       - name: Execute go-apidiff
         uses: joelanford/go-apidiff@v0.8.2
         with:

diff --git a/.github/workflows/lint-sample.yml b/.github/workflows/lint-sample.yml
@@ -17,7 +17,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '~1.20'
+          go-version: '~1.21'
       - name: Remove pre-installed kustomize
         run: sudo rm -f /usr/local/bin/kustomize
       - name: Run make test for project-v4-with-deploy-image
@@ -34,7 +34,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '~1.20'
+          go-version: '~1.21'
       - name: Clone the code
         uses: actions/checkout@v4
       - name: Run linter

diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
@@ -15,7 +15,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '~1.20'
+          go-version: '~1.21'
       - name: Clone the code
         uses: actions/checkout@v4
       - name: Run linter

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
@@ -17,7 +17,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '~1.20'
+          go-version: '~1.21'
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v5
         with:

diff --git a/.github/workflows/test-sample-go.yml b/.github/workflows/test-sample-go.yml
@@ -19,7 +19,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '~1.20'
+          go-version: '~1.21'
 
       - name: Install Kind
         run: go install sigs.k8s.io/kind@v$kind_version

diff --git a/.github/workflows/testdata.yml b/.github/workflows/testdata.yml
@@ -18,7 +18,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '~1.20'
+          go-version: '~1.21'
       - name: Remove pre-installed kustomize
         # This step is needed as the following one tries to remove
         # kustomize for each test but has no permission to do so

diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '~1.20'
+          go-version: '~1.21'
       # This step is needed as the following one tries to remove
       # kustomize for each test but has no permission to do so
       - name: Remove pre-installed kustomize
@@ -52,7 +52,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: "1.20"
+          go-version: "1.21"
       - name: Generate the coverage output
         run: make test-coverage
       - name: Send the coverage output

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -10,7 +10,7 @@ Please see https://git.k8s.io/community/CLA.md for more info.
 
 ## Prerequisites
 
-- [go](https://golang.org/dl/) version v1.20+.
+- [go](https://golang.org/dl/) version v1.21+.
 - [docker](https://docs.docker.com/install/) version 17.03+.
 - [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/) version v1.11.3+.
 - [kustomize](https://github.com/kubernetes-sigs/kustomize/blob/master/site/content/en/docs/Getting%20started/installation.md) v3.1.0+

diff --git a/docs/book/book.toml b/docs/book/book.toml
@@ -17,8 +17,8 @@ command = "./litgo.sh"
 command = "./markerdocs.sh"
 
 [context.environment]
-  environment = { GO_VERSION = "1.20" }
+  environment = { GO_VERSION = "1.21" }
 
 [context.deploy-preview.environment]
-  environment = { GO_VERSION = "1.20" }
+  environment = { GO_VERSION = "1.21" }
 
diff --git a/docs/book/src/component-config-tutorial/testdata/project/Dockerfile b/docs/book/src/component-config-tutorial/testdata/project/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.20 AS builder
+FROM golang:1.21 AS builder
 ARG TARGETOS
 ARG TARGETARCH
 

diff --git a/docs/book/src/component-config-tutorial/testdata/project/README.md b/docs/book/src/component-config-tutorial/testdata/project/README.md
@@ -7,7 +7,7 @@
 ## Getting Started
 
 ### Prerequisites
-- go version v1.20.0+
+- go version v1.21.0+
 - docker version 17.03+.
 - kubectl version v1.11.3+.
 - Access to a Kubernetes v1.11.3+ cluster.

diff --git a/docs/book/src/component-config-tutorial/testdata/project/go.mod b/docs/book/src/component-config-tutorial/testdata/project/go.mod
@@ -1,6 +1,6 @@
 module tutorial.kubebuilder.io/project
 
-go 1.20
+go 1.21
 
 require (
 	github.com/onsi/ginkgo/v2 v2.11.0

diff --git a/docs/book/src/component-config-tutorial/testdata/project/go.sum b/docs/book/src/component-config-tutorial/testdata/project/go.sum
@@ -1,5 +1,6 @@
 github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/benbjohnson/clock v1.3.0 h1:ip6w0uFQkncKQ979AypyG0ER7mqUSBdKLOgAle/AT8A=
+github.com/benbjohnson/clock v1.3.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
@@ -14,6 +15,7 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/emicklei/go-restful/v3 v3.11.0 h1:rAQeMHw1c7zTmncogyy8VvRZwtkmkZ4FxERmMY4rD+g=
 github.com/emicklei/go-restful/v3 v3.11.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
 github.com/evanphx/json-patch v5.6.0+incompatible h1:jBYDEEiFBPxA0v50tFdvOzQQTCvpL6mnFh5mB2/l16U=
+github.com/evanphx/json-patch v5.6.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
 github.com/evanphx/json-patch/v5 v5.6.0 h1:b91NhWfaz02IuVxO9faSllyAtNXHMPkC5J8sJCLunww=
 github.com/evanphx/json-patch/v5 v5.6.0/go.mod h1:G79N1coSVB93tBe7j6PhzjmR3/2VvlbKOFpnXhI9Bw4=
 github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
@@ -65,6 +67,7 @@ github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+o
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
@@ -98,6 +101,7 @@ github.com/prometheus/common v0.44.0/go.mod h1:ofAIvZbQ1e/nugmZGz4/qCb9Ap1VoSTIO
 github.com/prometheus/procfs v0.10.1 h1:kYK1Va/YMlutzCGazswoHKo//tZVlFpKYh+PymziUAg=
 github.com/prometheus/procfs v0.10.1/go.mod h1:nwNm2aOCAYw8uTR/9bWRREkZFxAUcWzPHWJq+XBB/FM=
 github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
+github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -110,12 +114,14 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
+github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/goleak v1.1.11/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ=
 go.uber.org/goleak v1.2.1 h1:NBol2c7O1ZokfZ0LEU9K6Whx/KnwvepVetCUhtKja4A=
+go.uber.org/goleak v1.2.1/go.mod h1:qlT2yGI9QafXHhZZLxlSuNsMw3FFLxBr+tBRlmO1xH4=
 go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
 go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
 go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
@@ -132,6 +138,7 @@ golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.10.0 h1:lFO9qtOdlre5W1jxS3r/4szv2/6iXxScdzjoBMXNhYk=
+golang.org/x/mod v0.10.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=

diff --git a/docs/book/src/cronjob-tutorial/testdata/project/Dockerfile b/docs/book/src/cronjob-tutorial/testdata/project/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.20 AS builder
+FROM golang:1.21 AS builder
 ARG TARGETOS
 ARG TARGETARCH
 

diff --git a/docs/book/src/cronjob-tutorial/testdata/project/README.md b/docs/book/src/cronjob-tutorial/testdata/project/README.md
@@ -7,7 +7,7 @@
 ## Getting Started
 
 ### Prerequisites
-- go version v1.20.0+
+- go version v1.21.0+
 - docker version 17.03+.
 - kubectl version v1.11.3+.
 - Access to a Kubernetes v1.11.3+ cluster.

diff --git a/docs/book/src/cronjob-tutorial/testdata/project/go.mod b/docs/book/src/cronjob-tutorial/testdata/project/go.mod
@@ -1,6 +1,6 @@
 module tutorial.kubebuilder.io/project
 
-go 1.20
+go 1.21
 
 require (
 	github.com/onsi/ginkgo/v2 v2.11.0

diff --git a/docs/book/src/cronjob-tutorial/testdata/project/go.sum b/docs/book/src/cronjob-tutorial/testdata/project/go.sum
@@ -1,5 +1,6 @@
 github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/benbjohnson/clock v1.3.0 h1:ip6w0uFQkncKQ979AypyG0ER7mqUSBdKLOgAle/AT8A=
+github.com/benbjohnson/clock v1.3.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
@@ -14,6 +15,7 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/emicklei/go-restful/v3 v3.11.0 h1:rAQeMHw1c7zTmncogyy8VvRZwtkmkZ4FxERmMY4rD+g=
 github.com/emicklei/go-restful/v3 v3.11.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
 github.com/evanphx/json-patch v5.6.0+incompatible h1:jBYDEEiFBPxA0v50tFdvOzQQTCvpL6mnFh5mB2/l16U=
+github.com/evanphx/json-patch v5.6.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
 github.com/evanphx/json-patch/v5 v5.6.0 h1:b91NhWfaz02IuVxO9faSllyAtNXHMPkC5J8sJCLunww=
 github.com/evanphx/json-patch/v5 v5.6.0/go.mod h1:G79N1coSVB93tBe7j6PhzjmR3/2VvlbKOFpnXhI9Bw4=
 github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
@@ -65,6 +67,7 @@ github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+o
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
@@ -100,6 +103,7 @@ github.com/prometheus/procfs v0.10.1/go.mod h1:nwNm2aOCAYw8uTR/9bWRREkZFxAUcWzPH
 github.com/robfig/cron v1.2.0 h1:ZjScXvvxeQ63Dbyxy76Fj3AT3Ut0aKsyd2/tl3DTMuQ=
 github.com/robfig/cron v1.2.0/go.mod h1:JGuDeoQd7Z6yL4zQhZ3OPEVHB7fL6Ka6skscFHfmt2k=
 github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
+github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -112,12 +116,14 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
+github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/goleak v1.1.11/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ=
 go.uber.org/goleak v1.2.1 h1:NBol2c7O1ZokfZ0LEU9K6Whx/KnwvepVetCUhtKja4A=
+go.uber.org/goleak v1.2.1/go.mod h1:qlT2yGI9QafXHhZZLxlSuNsMw3FFLxBr+tBRlmO1xH4=
 go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
 go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
 go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
@@ -134,6 +140,7 @@ golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.10.0 h1:lFO9qtOdlre5W1jxS3r/4szv2/6iXxScdzjoBMXNhYk=
+golang.org/x/mod v0.10.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=

diff --git a/docs/book/src/simple-external-plugin-tutorial/testdata/sampleexternalplugin/v1/go.mod b/docs/book/src/simple-external-plugin-tutorial/testdata/sampleexternalplugin/v1/go.mod
@@ -1,6 +1,6 @@
 module v1
 
-go 1.20
+go 1.21
 
 require (
 	github.com/spf13/pflag v1.0.5

diff --git a/go.mod b/go.mod
@@ -1,6 +1,6 @@
 module sigs.k8s.io/kubebuilder/v3
 
-go 1.20
+go 1.21
 
 require (
 	github.com/gobuffalo/flect v1.0.2

diff --git a/go.sum b/go.sum
@@ -9,6 +9,7 @@ github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572/go.mod h1:9Pwr4
 github.com/gobuffalo/flect v1.0.2 h1:eqjPGSo2WmjgY2XlpGwo2NXgL3RucAKo4k4qQMNA5sA=
 github.com/gobuffalo/flect v1.0.2/go.mod h1:A5msMlrHtLqh9umBSnvabjsMrCcCpAyzglnDvkbYKHs=
 github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
@@ -45,6 +46,7 @@ golang.org/x/mod v0.14.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/net v0.20.0 h1:aCL9BSgETF1k+blQaYUBx9hJ9LOGP3gAVemcZlf1Kpo=
 golang.org/x/net v0.20.0/go.mod h1:z8BVo6PvndSri0LbOE3hAn0apkU+1YvI6E70E9jsnvY=
 golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
+golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
 golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
@@ -53,6 +55,7 @@ golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/tools v0.17.0 h1:FvmRgNOcs3kOa+T20R1uhfP9F6HgG2mfxDv1vrx1Htc=
 golang.org/x/tools v0.17.0/go.mod h1:xsh6VxdV005rRVaS6SSAf9oiAqljS7UZUacMZ8Bnsps=
 google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
+google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

diff --git a/pkg/plugins/golang/go_version_test.go b/pkg/plugins/golang/go_version_test.go
@@ -198,6 +198,7 @@ var _ = Describe("checkGoVersion", func() {
 		Entry("for go.1.19", "go1.19"),
 		Entry("for go.1.19.1", "go1.19.1"),
 		Entry("for go.1.20", "go1.20"),
+		Entry("for go.1.21", "go1.21"),
 	)
 
 	DescribeTable("should return an error for non-supported go versions",

diff --git a/pkg/plugins/golang/v4/scaffolds/internal/templates/dockerfile.go b/pkg/plugins/golang/v4/scaffolds/internal/templates/dockerfile.go
@@ -39,7 +39,7 @@ func (f *Dockerfile) SetTemplateDefaults() error {
 }
 
 const dockerfileTemplate = `# Build the manager binary
-FROM golang:1.20 AS builder
+FROM golang:1.21 AS builder
 ARG TARGETOS
 ARG TARGETARCH
 

diff --git a/pkg/plugins/golang/v4/scaffolds/internal/templates/gomod.go b/pkg/plugins/golang/v4/scaffolds/internal/templates/gomod.go
@@ -46,7 +46,7 @@ func (f *GoMod) SetTemplateDefaults() error {
 const goModTemplate = `
 module {{ .Repo }}
 
-go 1.20
+go 1.21
 
 require (
 	sigs.k8s.io/controller-runtime {{ .ControllerRuntimeVersion }}

diff --git a/pkg/plugins/golang/v4/scaffolds/internal/templates/readme.go b/pkg/plugins/golang/v4/scaffolds/internal/templates/readme.go
@@ -66,7 +66,7 @@ const readmeFileTemplate = `# {{ .ProjectName }}
 ## Getting Started
 
 ### Prerequisites
-- go version v1.20.0+
+- go version v1.21.0+
 - docker version 17.03+.
 - kubectl version v1.11.3+.
 - Access to a Kubernetes v1.11.3+ cluster.

diff --git a/test/common.sh b/test/common.sh
@@ -23,7 +23,7 @@ function convert_to_tools_ver {
   # 1.14-1.19 work with the 1.19 server bins and kubectl.
   "1.14"|"1.15"|"1.16"|"1.17"|"1.18"|"1.19") echo "1.19.2";;
   # Tests in 1.20 and 1.21 with their counterpart version's apiserver.
-  "1.20"|"1.21") echo "1.19.2";;
+  "1.20"|"1.21") echo "1.21.5";;
   "1.22") echo "1.22.1";;
   "1.23") echo "1.23.3";;
   "1.24") echo "1.24.1";;

diff --git a/testdata/project-v4-multigroup-with-deploy-image/Dockerfile b/testdata/project-v4-multigroup-with-deploy-image/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.20 AS builder
+FROM golang:1.21 AS builder
 ARG TARGETOS
 ARG TARGETARCH
 

diff --git a/testdata/project-v4-multigroup-with-deploy-image/README.md b/testdata/project-v4-multigroup-with-deploy-image/README.md
@@ -7,7 +7,7 @@
 ## Getting Started
 
 ### Prerequisites
-- go version v1.20.0+
+- go version v1.21.0+
 - docker version 17.03+.
 - kubectl version v1.11.3+.
 - Access to a Kubernetes v1.11.3+ cluster.

diff --git a/testdata/project-v4-multigroup-with-deploy-image/go.mod b/testdata/project-v4-multigroup-with-deploy-image/go.mod
@@ -1,6 +1,6 @@
 module sigs.k8s.io/kubebuilder/testdata/project-v4-multigroup-with-deploy-image
 
-go 1.20
+go 1.21
 
 require (
 	github.com/onsi/ginkgo/v2 v2.11.0

diff --git a/testdata/project-v4-multigroup/Dockerfile b/testdata/project-v4-multigroup/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.20 AS builder
+FROM golang:1.21 AS builder
 ARG TARGETOS
 ARG TARGETARCH
 

diff --git a/testdata/project-v4-multigroup/README.md b/testdata/project-v4-multigroup/README.md
@@ -7,7 +7,7 @@
 ## Getting Started
 
 ### Prerequisites
-- go version v1.20.0+
+- go version v1.21.0+
 - docker version 17.03+.
 - kubectl version v1.11.3+.
 - Access to a Kubernetes v1.11.3+ cluster.

diff --git a/testdata/project-v4-multigroup/go.mod b/testdata/project-v4-multigroup/go.mod
@@ -1,6 +1,6 @@
 module sigs.k8s.io/kubebuilder/testdata/project-v4-multigroup
 
-go 1.20
+go 1.21
 
 require (
 	github.com/onsi/ginkgo/v2 v2.11.0

diff --git a/testdata/project-v4-with-deploy-image/Dockerfile b/testdata/project-v4-with-deploy-image/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.20 AS builder
+FROM golang:1.21 AS builder
 ARG TARGETOS
 ARG TARGETARCH