diff --git a/pkg/crd/gen_integration_test.go b/pkg/crd/gen_integration_test.go
index 7d256ca5b..e5dc41640 100644
--- a/pkg/crd/gen_integration_test.go
+++ b/pkg/crd/gen_integration_test.go
@@ -19,7 +19,6 @@ package crd_test
 import (
 	"bytes"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -93,7 +92,7 @@ var _ = Describe("CRD Generation proper defaulting", func() {
 		Expect(gen.Generate(ctx)).NotTo(HaveOccurred())
 
 		By("loading the desired YAML")
-		expectedFile, err := ioutil.ReadFile(filepath.Join(genDir, "bar.example.com_foos.yaml"))
+		expectedFile, err := os.ReadFile(filepath.Join(genDir, "bar.example.com_foos.yaml"))
 		Expect(err).NotTo(HaveOccurred())
 		expectedFile = fixAnnotations(expectedFile)
 
@@ -109,10 +108,10 @@ var _ = Describe("CRD Generation proper defaulting", func() {
 		Expect(gen.Generate(ctx2)).NotTo(HaveOccurred())
 
 		By("loading the desired YAMLs")
-		expectedFileFoos, err := ioutil.ReadFile(filepath.Join(genDir, "bar.example.com_foos.yaml"))
+		expectedFileFoos, err := os.ReadFile(filepath.Join(genDir, "bar.example.com_foos.yaml"))
 		Expect(err).NotTo(HaveOccurred())
 		expectedFileFoos = fixAnnotations(expectedFileFoos)
-		expectedFileZoos, err := ioutil.ReadFile(filepath.Join(genDir, "zoo", "bar.example.com_zoos.yaml"))
+		expectedFileZoos, err := os.ReadFile(filepath.Join(genDir, "zoo", "bar.example.com_zoos.yaml"))
 		Expect(err).NotTo(HaveOccurred())
 		expectedFileZoos = fixAnnotations(expectedFileZoos)
 
diff --git a/pkg/crd/parser_integration_test.go b/pkg/crd/parser_integration_test.go
index 76a9e1f3a..e6472e68d 100644
--- a/pkg/crd/parser_integration_test.go
+++ b/pkg/crd/parser_integration_test.go
@@ -18,7 +18,6 @@ package crd_test
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 
 	"github.com/google/go-cmp/cmp"
@@ -116,7 +115,7 @@ var _ = Describe("CRD Generation From Parsing to CustomResourceDefinition", func
 			ExpectWithOffset(1, parser.CustomResourceDefinitions).To(HaveKey(groupKind))
 
 			By(fmt.Sprintf("loading the desired %s YAML", kind))
-			expectedFile, err := ioutil.ReadFile(fileName)
+			expectedFile, err := os.ReadFile(fileName)
 			ExpectWithOffset(1, err).NotTo(HaveOccurred())
 
 			By(fmt.Sprintf("parsing the desired %s YAML", kind))
@@ -219,7 +218,7 @@ var _ = Describe("CRD Generation From Parsing to CustomResourceDefinition", func
 		crd.FixTopLevelMetadata(parser.CustomResourceDefinitions[groupKind])
 
 		By("loading the desired YAML")
-		expectedFile, err := ioutil.ReadFile("plural.example.com_testquotas.yaml")
+		expectedFile, err := os.ReadFile("plural.example.com_testquotas.yaml")
 		Expect(err).NotTo(HaveOccurred())
 
 		By("parsing the desired YAML")
@@ -301,7 +300,7 @@ var _ = Describe("CRD Generation From Parsing to CustomResourceDefinition", func
 		crd.FixTopLevelMetadata(parser.CustomResourceDefinitions[groupKind])
 
 		By("loading the desired YAML")
-		expectedFile, err := ioutil.ReadFile("testdata.kubebuilder.io_versionedresources.yaml")
+		expectedFile, err := os.ReadFile("testdata.kubebuilder.io_versionedresources.yaml")
 		Expect(err).NotTo(HaveOccurred())
 
 		By("parsing the desired YAML")
diff --git a/pkg/deepcopy/deepcopy_integration_test.go b/pkg/deepcopy/deepcopy_integration_test.go
index a81ef190d..608d6e720 100644
--- a/pkg/deepcopy/deepcopy_integration_test.go
+++ b/pkg/deepcopy/deepcopy_integration_test.go
@@ -18,7 +18,6 @@ package deepcopy_test
 
 import (
 	"io"
-	"io/ioutil"
 	"os"
 	"sort"
 
@@ -97,7 +96,7 @@ var _ = Describe("CRD Generation From Parsing to CustomResourceDefinition", func
 		Expect(outContents).NotTo(BeNil())
 
 		By("loading the desired code")
-		expectedFile, err := ioutil.ReadFile("zz_generated.deepcopy.go")
+		expectedFile, err := os.ReadFile("zz_generated.deepcopy.go")
 		Expect(err).NotTo(HaveOccurred())
 
 		By("comparing the two")
diff --git a/pkg/genall/genall.go b/pkg/genall/genall.go
index bed7ec603..b553db14c 100644
--- a/pkg/genall/genall.go
+++ b/pkg/genall/genall.go
@@ -20,7 +20,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 
 	"golang.org/x/tools/go/packages"
@@ -214,7 +213,7 @@ func (g GenerationContext) ReadFile(path string) ([]byte, error) {
 		return nil, err
 	}
 	defer file.Close()
-	return ioutil.ReadAll(file)
+	return io.ReadAll(file)
 }
 
 // ForRoots produces a Runtime to run the given generators against the
diff --git a/pkg/genall/output.go b/pkg/genall/output.go
index 4cd29f496..3eb43b0c2 100644
--- a/pkg/genall/output.go
+++ b/pkg/genall/output.go
@@ -19,7 +19,6 @@ package genall
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -92,7 +91,7 @@ var OutputToNothing = outputToNothing{}
 type outputToNothing struct{}
 
 func (o outputToNothing) Open(_ *loader.Package, _ string) (io.WriteCloser, error) {
-	return nopCloser{ioutil.Discard}, nil
+	return nopCloser{io.Discard}, nil
 }
 
 // +controllertools:marker:generateHelp:category=""
diff --git a/pkg/loader/loader.go b/pkg/loader/loader.go
index 2efa94c7d..7762e53e7 100644
--- a/pkg/loader/loader.go
+++ b/pkg/loader/loader.go
@@ -23,7 +23,6 @@ import (
 	"go/scanner"
 	"go/token"
 	"go/types"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -111,7 +110,7 @@ func (p *Package) NeedSyntax() {
 	for i, filename := range p.CompiledGoFiles {
 		go func(i int, filename string) {
 			defer wg.Done()
-			src, err := ioutil.ReadFile(filename)
+			src, err := os.ReadFile(filename)
 			if err != nil {
 				p.AddError(err)
 				return
diff --git a/pkg/rbac/parser_integration_test.go b/pkg/rbac/parser_integration_test.go
index a56c1ec6a..f4f7bf45a 100644
--- a/pkg/rbac/parser_integration_test.go
+++ b/pkg/rbac/parser_integration_test.go
@@ -3,7 +3,6 @@ package rbac_test
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"os"
 
 	"github.com/google/go-cmp/cmp"
@@ -49,7 +48,7 @@ var _ = Describe("ClusterRole generated by the RBAC Generator", func() {
 			Expect(err).NotTo(HaveOccurred())
 
 			By("loading the desired YAML")
-			expectedFile, err := ioutil.ReadFile("role.yaml")
+			expectedFile, err := os.ReadFile("role.yaml")
 			Expect(err).NotTo(HaveOccurred())
 
 			By("parsing the desired YAML")
diff --git a/pkg/schemapatcher/gen.go b/pkg/schemapatcher/gen.go
index e33ec11ff..8080aeae7 100644
--- a/pkg/schemapatcher/gen.go
+++ b/pkg/schemapatcher/gen.go
@@ -18,7 +18,7 @@ package schemapatcher
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 
 	"gopkg.in/yaml.v3"
@@ -335,7 +335,7 @@ func (e *partialCRD) setVersionedSchemata(newSchemata map[string]apiext.JSONSche
 // minimally invasive.  Returned CRDs are mapped by group-kind.
 func crdsFromDirectory(ctx *genall.GenerationContext, dir string) (map[schema.GroupKind]*partialCRDSet, error) {
 	res := map[schema.GroupKind]*partialCRDSet{}
-	dirEntries, err := ioutil.ReadDir(dir)
+	dirEntries, err := os.ReadDir(dir)
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/schemapatcher/gen_integration_test.go b/pkg/schemapatcher/gen_integration_test.go
index d1c8485d6..1d15e5f2a 100644
--- a/pkg/schemapatcher/gen_integration_test.go
+++ b/pkg/schemapatcher/gen_integration_test.go
@@ -17,7 +17,6 @@ limitations under the License.
 package schemapatcher_test
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -44,7 +43,7 @@ var _ = Describe("CRD Patching From Parsing to Editing", func() {
 		rt, err := genall.Generators{&crdSchemaGen}.ForRoots("./...")
 		Expect(err).NotTo(HaveOccurred())
 
-		outputDir, err := ioutil.TempDir("", "controller-tools-test")
+		outputDir, err := os.MkdirTemp("", "controller-tools-test")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(outputDir)
 		rt.OutputRules.Default = genall.OutputToDirectory(outputDir)
@@ -70,7 +69,7 @@ var _ = Describe("CRD Patching From Parsing to Editing", func() {
 		rt, err := genall.Generators{&crdSchemaGen}.ForRoots("./...")
 		Expect(err).NotTo(HaveOccurred())
 
-		outputDir, err := ioutil.TempDir("", "controller-tools-test")
+		outputDir, err := os.MkdirTemp("", "controller-tools-test")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(outputDir)
 		rt.OutputRules.Default = genall.OutputToDirectory(outputDir)
@@ -80,15 +79,15 @@ var _ = Describe("CRD Patching From Parsing to Editing", func() {
 		Expect(rt.Run()).To(BeFalse(), "unexpectedly had errors")
 
 		By("loading the output files")
-		expectedFiles, err := ioutil.ReadDir("expected")
+		expectedFiles, err := os.ReadDir("expected")
 		Expect(err).NotTo(HaveOccurred())
 
 		for _, expectedFile := range expectedFiles {
 			By("reading the expected and actual files for " + expectedFile.Name())
-			actualContents, err := ioutil.ReadFile(filepath.Join(outputDir, expectedFile.Name()))
+			actualContents, err := os.ReadFile(filepath.Join(outputDir, expectedFile.Name()))
 			Expect(err).NotTo(HaveOccurred())
 
-			expectedContents, err := ioutil.ReadFile(filepath.Join("expected", expectedFile.Name()))
+			expectedContents, err := os.ReadFile(filepath.Join("expected", expectedFile.Name()))
 			Expect(err).NotTo(HaveOccurred())
 
 			By("checking that the expected and actual files for " + expectedFile.Name() + " are identical")
diff --git a/pkg/webhook/parser_integration_test.go b/pkg/webhook/parser_integration_test.go
index 204c0cb43..f020cfc2e 100644
--- a/pkg/webhook/parser_integration_test.go
+++ b/pkg/webhook/parser_integration_test.go
@@ -18,7 +18,6 @@ package webhook_test
 
 import (
 	"bytes"
-	"io/ioutil"
 	"os"
 	"path"
 
@@ -59,7 +58,7 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 		Expect(reg.Register(webhook.ConfigDefinition)).To(Succeed())
 
 		By("requesting that the manifest be generated")
-		outputDir, err := ioutil.TempDir("", "webhook-integration-test")
+		outputDir, err := os.MkdirTemp("", "webhook-integration-test")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(outputDir)
 		genCtx := &genall.GenerationContext{
@@ -88,7 +87,7 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 		Expect(reg.Register(webhook.ConfigDefinition)).To(Succeed())
 
 		By("requesting that the manifest be generated")
-		outputDir, err := ioutil.TempDir("", "webhook-integration-test")
+		outputDir, err := os.MkdirTemp("", "webhook-integration-test")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(outputDir)
 		genCtx := &genall.GenerationContext{
@@ -119,7 +118,7 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 		Expect(reg.Register(webhook.ConfigDefinition)).To(Succeed())
 
 		By("requesting that the manifest be generated")
-		outputDir, err := ioutil.TempDir("", "webhook-integration-test")
+		outputDir, err := os.MkdirTemp("", "webhook-integration-test")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(outputDir)
 		genCtx := &genall.GenerationContext{
@@ -148,7 +147,7 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 		Expect(reg.Register(webhook.ConfigDefinition)).To(Succeed())
 
 		By("requesting that the manifest be generated")
-		outputDir, err := ioutil.TempDir("", "webhook-integration-test")
+		outputDir, err := os.MkdirTemp("", "webhook-integration-test")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(outputDir)
 		genCtx := &genall.GenerationContext{
@@ -177,7 +176,7 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 		Expect(reg.Register(webhook.ConfigDefinition)).To(Succeed())
 
 		By("requesting that the manifest be generated")
-		outputDir, err := ioutil.TempDir("", "webhook-integration-test")
+		outputDir, err := os.MkdirTemp("", "webhook-integration-test")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(outputDir)
 		genCtx := &genall.GenerationContext{
@@ -191,12 +190,12 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 		}
 
 		By("loading the generated v1 YAML")
-		actualFile, err := ioutil.ReadFile(path.Join(outputDir, "manifests.yaml"))
+		actualFile, err := os.ReadFile(path.Join(outputDir, "manifests.yaml"))
 		Expect(err).NotTo(HaveOccurred())
 		actualMutating, actualValidating := unmarshalBothV1(actualFile)
 
 		By("loading the desired v1 YAML")
-		expectedFile, err := ioutil.ReadFile("manifests.yaml")
+		expectedFile, err := os.ReadFile("manifests.yaml")
 		Expect(err).NotTo(HaveOccurred())
 		expectedMutating, expectedValidating := unmarshalBothV1(expectedFile)
 
@@ -222,7 +221,7 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 		Expect(reg.Register(webhook.ConfigDefinition)).To(Succeed())
 
 		By("requesting that the manifest be generated")
-		outputDir, err := ioutil.TempDir("", "webhook-integration-test")
+		outputDir, err := os.MkdirTemp("", "webhook-integration-test")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(outputDir)
 
@@ -238,13 +237,13 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 			}
 
 			By("loading the generated v1 YAML")
-			actualFile, err := ioutil.ReadFile(path.Join(outputDir, "manifests.yaml"))
+			actualFile, err := os.ReadFile(path.Join(outputDir, "manifests.yaml"))
 			Expect(err).NotTo(HaveOccurred())
 			actualManifest := &admissionregv1.ValidatingWebhookConfiguration{}
 			Expect(yaml.UnmarshalStrict(actualFile, actualManifest)).To(Succeed())
 
 			By("loading the desired v1 YAML")
-			expectedFile, err := ioutil.ReadFile("manifests.yaml")
+			expectedFile, err := os.ReadFile("manifests.yaml")
 			Expect(err).NotTo(HaveOccurred())
 			expectedManifest := &admissionregv1.ValidatingWebhookConfiguration{}
 			Expect(yaml.UnmarshalStrict(expectedFile, expectedManifest)).To(Succeed())
@@ -271,7 +270,7 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 		Expect(reg.Register(webhook.ConfigDefinition)).To(Succeed())
 
 		By("requesting that the manifest be generated")
-		outputDir, err := ioutil.TempDir("", "webhook-integration-test")
+		outputDir, err := os.MkdirTemp("", "webhook-integration-test")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(outputDir)
 		genCtx := &genall.GenerationContext{
@@ -285,12 +284,12 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 		}
 
 		By("loading the generated v1 YAML")
-		actualFile, err := ioutil.ReadFile(path.Join(outputDir, "manifests.yaml"))
+		actualFile, err := os.ReadFile(path.Join(outputDir, "manifests.yaml"))
 		Expect(err).NotTo(HaveOccurred())
 		actualMutating, actualValidating := unmarshalBothV1(actualFile)
 
 		By("loading the desired v1 YAML")
-		expectedFile, err := ioutil.ReadFile("manifests.yaml")
+		expectedFile, err := os.ReadFile("manifests.yaml")
 		Expect(err).NotTo(HaveOccurred())
 		expectedMutating, expectedValidating := unmarshalBothV1(expectedFile)
 
@@ -316,7 +315,7 @@ var _ = Describe("Webhook Generation From Parsing to CustomResourceDefinition",
 		Expect(reg.Register(webhook.ConfigDefinition)).To(Succeed())
 
 		By("requesting that the manifest be generated")
-		outputDir, err := ioutil.TempDir("", "webhook-integration-test")
+		outputDir, err := os.MkdirTemp("", "webhook-integration-test")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(outputDir)
 		genCtx := &genall.GenerationContext{