diff --git a/api/auth/azure/azure.go b/api/auth/azure/azure.go
index b682195701..ecca535b43 100644
--- a/api/auth/azure/azure.go
+++ b/api/auth/azure/azure.go
@@ -7,7 +7,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"time"
@@ -175,7 +175,7 @@ func (a *AzureAuth) getJWT() (string, error) {
 	}
 	defer resp.Body.Close()
 
-	responseBytes, err := ioutil.ReadAll(resp.Body)
+	responseBytes, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return "", fmt.Errorf("error reading response body from Azure token endpoint: %w", err)
 	}
@@ -222,7 +222,7 @@ func getMetadata() (metadataJSON, error) {
 	}
 	defer resp.Body.Close()
 
-	responseBytes, err := ioutil.ReadAll(resp.Body)
+	responseBytes, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return metadataJSON{}, fmt.Errorf("error reading response body from metadata endpoint: %w", err)
 	}
diff --git a/api/auth/gcp/gcp.go b/api/auth/gcp/gcp.go
index 2d6ef842a4..7f4f222c0c 100644
--- a/api/auth/gcp/gcp.go
+++ b/api/auth/gcp/gcp.go
@@ -7,7 +7,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"time"
@@ -181,7 +181,7 @@ func (a *GCPAuth) getJWTFromMetadataService(vaultAddress string) (string, error)
 	defer resp.Body.Close()
 
 	// get jwt from response
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	jwt := string(body)
 	if err != nil {
 		return "", fmt.Errorf("error reading response from metadata service: %w", err)
diff --git a/api/sys_raft.go b/api/sys_raft.go
index 699f6e9fd0..f0e896271b 100644
--- a/api/sys_raft.go
+++ b/api/sys_raft.go
@@ -264,7 +264,7 @@ func (c *Sys) RaftSnapshotWithContext(ctx context.Context, snapWriter io.Writer)
 				continue
 			}
 			var b []byte
-			b, err = ioutil.ReadAll(t)
+			b, err = io.ReadAll(t)
 			if err != nil || len(b) == 0 {
 				return
 			}
diff --git a/builtin/credential/aws/backend_test.go b/builtin/credential/aws/backend_test.go
index 771dc0e311..5770b2c5ed 100644
--- a/builtin/credential/aws/backend_test.go
+++ b/builtin/credential/aws/backend_test.go
@@ -8,7 +8,7 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"os"
 	"strings"
@@ -1516,7 +1516,7 @@ func buildCallerIdentityLoginData(request *http.Request, roleName string) (map[s
 	if err != nil {
 		return nil, err
 	}
-	requestBody, err := ioutil.ReadAll(request.Body)
+	requestBody, err := io.ReadAll(request.Body)
 	if err != nil {
 		return nil, err
 	}
diff --git a/builtin/credential/aws/path_login.go b/builtin/credential/aws/path_login.go
index a0e5a96505..fdb37da72b 100644
--- a/builtin/credential/aws/path_login.go
+++ b/builtin/credential/aws/path_login.go
@@ -12,7 +12,7 @@ import (
 	"encoding/xml"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"regexp"
@@ -1803,7 +1803,7 @@ func submitCallerIdentityRequest(ctx context.Context, maxRetries int, method, en
 	}
 
 	// we check for status code afterwards to also print out response body
-	responseBody, err := ioutil.ReadAll(response.Body)
+	responseBody, err := io.ReadAll(response.Body)
 	if err != nil {
 		return nil, err
 	}
diff --git a/builtin/credential/cert/test_responder.go b/builtin/credential/cert/test_responder.go
index 2052736d33..56fb4727be 100644
--- a/builtin/credential/cert/test_responder.go
+++ b/builtin/credential/cert/test_responder.go
@@ -19,7 +19,7 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"time"
@@ -168,7 +168,7 @@ func (rs *Responder) ServeHTTP(response http.ResponseWriter, request *http.Reque
 			return
 		}
 	case "POST":
-		requestBody, err = ioutil.ReadAll(request.Body)
+		requestBody, err = io.ReadAll(request.Body)
 		if err != nil {
 			rs.log.Log("Problem reading body of POST", err)
 			response.WriteHeader(http.StatusBadRequest)
diff --git a/builtin/logical/rabbitmq/path_role_create.go b/builtin/logical/rabbitmq/path_role_create.go
index 956a016720..c06e824428 100644
--- a/builtin/logical/rabbitmq/path_role_create.go
+++ b/builtin/logical/rabbitmq/path_role_create.go
@@ -6,7 +6,7 @@ package rabbitmq
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 
 	"github.com/hashicorp/vault/sdk/framework"
 	"github.com/hashicorp/vault/sdk/helper/template"
@@ -113,7 +113,7 @@ func (b *backend) pathCredsRead(ctx context.Context, req *logical.Request, d *fr
 		}
 	}()
 	if !isIn200s(resp.StatusCode) {
-		body, _ := ioutil.ReadAll(resp.Body)
+		body, _ := io.ReadAll(resp.Body)
 		return nil, fmt.Errorf("error creating user %s - %d: %s", username, resp.StatusCode, body)
 	}
 
@@ -128,7 +128,7 @@ func (b *backend) pathCredsRead(ctx context.Context, req *logical.Request, d *fr
 			b.Logger().Error(fmt.Sprintf("deleting %s due to permissions being in an unknown state, but failed: %s", username, err))
 		}
 		if !isIn200s(resp.StatusCode) {
-			body, _ := ioutil.ReadAll(resp.Body)
+			body, _ := io.ReadAll(resp.Body)
 			b.Logger().Error(fmt.Sprintf("deleting %s due to permissions being in an unknown state, but error deleting: %d: %s", username, resp.StatusCode, body))
 		}
 	}()
@@ -151,7 +151,7 @@ func (b *backend) pathCredsRead(ctx context.Context, req *logical.Request, d *fr
 				}
 			}()
 			if !isIn200s(resp.StatusCode) {
-				body, _ := ioutil.ReadAll(resp.Body)
+				body, _ := io.ReadAll(resp.Body)
 				return fmt.Errorf("error updating vhost permissions for %s - %d: %s", vhost, resp.StatusCode, body)
 			}
 			return nil
@@ -180,7 +180,7 @@ func (b *backend) pathCredsRead(ctx context.Context, req *logical.Request, d *fr
 					}
 				}()
 				if !isIn200s(resp.StatusCode) {
-					body, _ := ioutil.ReadAll(resp.Body)
+					body, _ := io.ReadAll(resp.Body)
 					return fmt.Errorf("error updating vhost permissions for %s - %d: %s", vhost, resp.StatusCode, body)
 				}
 				return nil
diff --git a/command/agentproxyshared/auth/gcp/gcp.go b/command/agentproxyshared/auth/gcp/gcp.go
index 5d913581bc..aaaf21d16a 100644
--- a/command/agentproxyshared/auth/gcp/gcp.go
+++ b/command/agentproxyshared/auth/gcp/gcp.go
@@ -8,7 +8,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"time"
 
@@ -151,7 +151,7 @@ func (g *gcpMethod) Authenticate(ctx context.Context, client *api.Client) (retPa
 				return
 			}
 			defer resp.Body.Close()
-			jwtBytes, err := ioutil.ReadAll(resp.Body)
+			jwtBytes, err := io.ReadAll(resp.Body)
 			if err != nil {
 				retErr = fmt.Errorf("error reading instance token response body: %w", err)
 				return
diff --git a/command/agentproxyshared/auth/kubernetes/kubernetes.go b/command/agentproxyshared/auth/kubernetes/kubernetes.go
index 639226505f..6f16a2b9b4 100644
--- a/command/agentproxyshared/auth/kubernetes/kubernetes.go
+++ b/command/agentproxyshared/auth/kubernetes/kubernetes.go
@@ -8,7 +8,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"strings"
@@ -123,7 +122,7 @@ func (k *kubernetesMethod) readJWT() (string, error) {
 	}
 	defer data.Close()
 
-	contentBytes, err := ioutil.ReadAll(data)
+	contentBytes, err := io.ReadAll(data)
 	if err != nil {
 		return "", err
 	}
diff --git a/command/agentproxyshared/cache/proxy.go b/command/agentproxyshared/cache/proxy.go
index 503d981d60..231c5d9d20 100644
--- a/command/agentproxyshared/cache/proxy.go
+++ b/command/agentproxyshared/cache/proxy.go
@@ -57,7 +57,7 @@ func NewSendResponse(apiResponse *api.Response, responseBody []byte) (*SendRespo
 	}
 
 	// If a response body is separately provided we set that as the SendResponse.ResponseBody,
-	// otherwise we will do an ioutil.ReadAll to extract the response body from apiResponse.
+	// otherwise we will do an io.ReadAll to extract the response body from apiResponse.
 	switch {
 	case len(responseBody) > 0:
 		resp.ResponseBody = responseBody
diff --git a/helper/testhelpers/testhelpers.go b/helper/testhelpers/testhelpers.go
index 184f064c86..e7f8ed30a0 100644
--- a/helper/testhelpers/testhelpers.go
+++ b/helper/testhelpers/testhelpers.go
@@ -9,7 +9,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"math/rand"
 	"os"
 	"strings"
@@ -641,7 +641,7 @@ func SysMetricsReq(client *api.Client, cluster *vault.TestCluster, unauth bool)
 	if err != nil {
 		return nil, err
 	}
-	bodyBytes, err := ioutil.ReadAll(resp.Response.Body)
+	bodyBytes, err := io.ReadAll(resp.Response.Body)
 	if err != nil {
 		return nil, err
 	}
diff --git a/http/plugin_test.go b/http/plugin_test.go
index c2e084e43d..8a1b35d98d 100644
--- a/http/plugin_test.go
+++ b/http/plugin_test.go
@@ -6,7 +6,7 @@ package http
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 	"reflect"
 	"sync"
@@ -147,7 +147,7 @@ func TestPlugin_MockRawResponse(t *testing.T) {
 		t.Fatal(err)
 	}
 	defer resp.Body.Close()
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/http/sys_health_test.go b/http/sys_health_test.go
index bd64ea8532..dcc3473b06 100644
--- a/http/sys_health_test.go
+++ b/http/sys_health_test.go
@@ -4,7 +4,7 @@
 package http
 
 import (
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"testing"
@@ -206,7 +206,7 @@ func TestSysHealth_head(t *testing.T) {
 			t.Fatalf("HEAD %v expected code %d, got %d.", queryurl, tt.code, resp.StatusCode)
 		}
 
-		data, err := ioutil.ReadAll(resp.Body)
+		data, err := io.ReadAll(resp.Body)
 		if err != nil {
 			t.Fatalf("err on %v: %s", queryurl, err)
 		}
diff --git a/physical/azure/azure.go b/physical/azure/azure.go
index fc016e7fe9..e941af1611 100644
--- a/physical/azure/azure.go
+++ b/physical/azure/azure.go
@@ -7,7 +7,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/url"
 	"os"
 	"regexp"
@@ -271,7 +271,7 @@ func (a *AzureBackend) Get(ctx context.Context, key string) (*physical.Entry, er
 	reader := res.Body(azblob.RetryReaderOptions{})
 	defer reader.Close()
 
-	data, err := ioutil.ReadAll(reader)
+	data, err := io.ReadAll(reader)
 
 	ent := &physical.Entry{
 		Key:   key,
diff --git a/physical/couchdb/couchdb.go b/physical/couchdb/couchdb.go
index 0a1c379c6e..cbb32e5609 100644
--- a/physical/couchdb/couchdb.go
+++ b/physical/couchdb/couchdb.go
@@ -8,7 +8,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"os"
@@ -114,7 +114,7 @@ func (m *couchDBClient) get(key string) (*physical.Entry, error) {
 	} else if resp.StatusCode != http.StatusOK {
 		return nil, fmt.Errorf("GET returned %q", resp.Status)
 	}
-	bs, err := ioutil.ReadAll(resp.Body)
+	bs, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, err
 	}
@@ -143,7 +143,7 @@ func (m *couchDBClient) list(prefix string) ([]couchDBListItem, error) {
 	}
 	defer resp.Body.Close()
 
-	data, err := ioutil.ReadAll(resp.Body)
+	data, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, err
 	}
diff --git a/physical/couchdb/couchdb_test.go b/physical/couchdb/couchdb_test.go
index bc8f6b41df..0428d52d25 100644
--- a/physical/couchdb/couchdb_test.go
+++ b/physical/couchdb/couchdb_test.go
@@ -6,7 +6,7 @@ package couchdb
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"os"
@@ -145,7 +145,7 @@ func setupCouchDB(ctx context.Context, host string, port int) (docker.ServiceCon
 		}
 		defer resp.Body.Close()
 		if resp.StatusCode != http.StatusCreated {
-			bs, _ := ioutil.ReadAll(resp.Body)
+			bs, _ := io.ReadAll(resp.Body)
 			return nil, fmt.Errorf("failed to create database: %s %s\n", resp.Status, string(bs))
 		}
 	}
@@ -164,7 +164,7 @@ func setupCouchDB(ctx context.Context, host string, port int) (docker.ServiceCon
 		}
 		defer resp.Body.Close()
 		if resp.StatusCode != http.StatusOK {
-			bs, _ := ioutil.ReadAll(resp.Body)
+			bs, _ := io.ReadAll(resp.Body)
 			return nil, fmt.Errorf("Failed to create admin user: %s %s\n", resp.Status, string(bs))
 		}
 	}
diff --git a/physical/gcs/gcs.go b/physical/gcs/gcs.go
index eea7a515ac..51b1f926ff 100644
--- a/physical/gcs/gcs.go
+++ b/physical/gcs/gcs.go
@@ -8,7 +8,7 @@ import (
 	"crypto/md5"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 	"sort"
 	"strconv"
@@ -230,7 +230,7 @@ func (b *Backend) Get(ctx context.Context, key string) (retEntry *physical.Entry
 		}
 	}()
 
-	value, err := ioutil.ReadAll(r)
+	value, err := io.ReadAll(r)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read value into a string: %w", err)
 	}
diff --git a/physical/oci/oci.go b/physical/oci/oci.go
index c27e7e237c..628f310491 100644
--- a/physical/oci/oci.go
+++ b/physical/oci/oci.go
@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"sort"
 	"strconv"
@@ -231,7 +230,7 @@ func (o *Backend) Get(ctx context.Context, key string) (*physical.Entry, error)
 		return nil, fmt.Errorf("failed to read Value: %w", err)
 	}
 
-	body, err := ioutil.ReadAll(resp.Content)
+	body, err := io.ReadAll(resp.Content)
 	if err != nil {
 		metrics.IncrCounter(metricGetFailed, 1)
 		return nil, fmt.Errorf("failed to decode Value into bytes: %w", err)
diff --git a/physical/oci/oci_ha.go b/physical/oci/oci_ha.go
index cf6b22e676..cc0e0edc62 100644
--- a/physical/oci/oci_ha.go
+++ b/physical/oci/oci_ha.go
@@ -8,7 +8,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"sync"
 	"sync/atomic"
@@ -399,7 +398,7 @@ func (l *Lock) get(ctx context.Context) (*LockRecord, string, error) {
 
 	defer response.RawResponse.Body.Close()
 
-	body, err := ioutil.ReadAll(response.Content)
+	body, err := io.ReadAll(response.Content)
 	if err != nil {
 		metrics.IncrCounter(metricGetFailed, 1)
 		l.backend.logger.Error("Error reading content", "err", err)
diff --git a/sdk/helper/certutil/helpers.go b/sdk/helper/certutil/helpers.go
index b7fc22db02..61bf7560f3 100644
--- a/sdk/helper/certutil/helpers.go
+++ b/sdk/helper/certutil/helpers.go
@@ -23,7 +23,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math/big"
 	"net"
 	"net/url"
@@ -1315,7 +1314,7 @@ func signCertificate(data *CreationBundle, randReader io.Reader) (*ParsedCertBun
 }
 
 func NewCertPool(reader io.Reader) (*x509.CertPool, error) {
-	pemBlock, err := ioutil.ReadAll(reader)
+	pemBlock, err := io.ReadAll(reader)
 	if err != nil {
 		return nil, err
 	}
diff --git a/sdk/helper/docker/testhelpers.go b/sdk/helper/docker/testhelpers.go
index f1fefd65cd..af1f3f72a6 100644
--- a/sdk/helper/docker/testhelpers.go
+++ b/sdk/helper/docker/testhelpers.go
@@ -12,7 +12,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/url"
 	"os"
 	"strconv"
@@ -415,7 +414,7 @@ func (d *Runner) Start(ctx context.Context, addSuffix, forceLocalAddr bool) (*St
 	}
 	resp, _ := d.DockerAPI.ImageCreate(ctx, cfg.Image, opts)
 	if resp != nil {
-		_, _ = ioutil.ReadAll(resp)
+		_, _ = io.ReadAll(resp)
 	}
 
 	for vol, mtpt := range d.RunOptions.VolumeNameToMountPoint {
diff --git a/sdk/helper/ocsp/ocsp_test.go b/sdk/helper/ocsp/ocsp_test.go
index 326a5b2336..1115766534 100644
--- a/sdk/helper/ocsp/ocsp_test.go
+++ b/sdk/helper/ocsp/ocsp_test.go
@@ -15,7 +15,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math/big"
 	"net"
 	"net/http"
@@ -64,7 +63,7 @@ func TestOCSP(t *testing.T) {
 				t.Fatalf("failed to GET contents. err: %v", err)
 			}
 			defer res.Body.Close()
-			_, err = ioutil.ReadAll(res.Body)
+			_, err = io.ReadAll(res.Body)
 			if err != nil {
 				t.Fatalf("failed to read content body for %v", tgt)
 			}
@@ -113,7 +112,7 @@ func TestMultiOCSP(t *testing.T) {
 			t.Fatalf("failed to GET contents. err: %v", err)
 		}
 		defer res.Body.Close()
-		_, err = ioutil.ReadAll(res.Body)
+		_, err = io.ReadAll(res.Body)
 		if err != nil {
 			t.Fatalf("failed to read content body for %v", tgt)
 		}
diff --git a/vault/external_tests/api/feature_flag_ext_test.go b/vault/external_tests/api/feature_flag_ext_test.go
index 4f8cc8138e..d5d45123ea 100644
--- a/vault/external_tests/api/feature_flag_ext_test.go
+++ b/vault/external_tests/api/feature_flag_ext_test.go
@@ -5,7 +5,7 @@ package api
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"os"
 	"testing"
@@ -54,7 +54,7 @@ func TestFeatureFlags(t *testing.T) {
 		}
 		defer resp.Body.Close()
 
-		httpRespBody, err := ioutil.ReadAll(resp.Body)
+		httpRespBody, err := io.ReadAll(resp.Body)
 		if err != nil {
 			t.Fatal(err)
 		}
diff --git a/vault/external_tests/metrics/core_metrics_int_test.go b/vault/external_tests/metrics/core_metrics_int_test.go
index 7a9005ed9b..fe8323299c 100644
--- a/vault/external_tests/metrics/core_metrics_int_test.go
+++ b/vault/external_tests/metrics/core_metrics_int_test.go
@@ -7,7 +7,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
-	"io/ioutil"
+	"io"
 	"testing"
 	"time"
 
@@ -139,7 +139,7 @@ func TestLeaderReElectionMetrics(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	bodyBytes, err := ioutil.ReadAll(respo.Response.Body)
+	bodyBytes, err := io.ReadAll(respo.Response.Body)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -183,7 +183,7 @@ func TestLeaderReElectionMetrics(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	bodyBytes, err = ioutil.ReadAll(respo.Response.Body)
+	bodyBytes, err = io.ReadAll(respo.Response.Body)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/vault/external_tests/pprof/pprof_test.go b/vault/external_tests/pprof/pprof_test.go
index 633d853210..dff9203012 100644
--- a/vault/external_tests/pprof/pprof_test.go
+++ b/vault/external_tests/pprof/pprof_test.go
@@ -5,7 +5,7 @@ package pprof
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"strconv"
 	"strings"
@@ -64,7 +64,7 @@ func TestSysPprof_MaxRequestDuration(t *testing.T) {
 	}
 	defer resp.Body.Close()
 
-	httpRespBody, err := ioutil.ReadAll(resp.Body)
+	httpRespBody, err := io.ReadAll(resp.Body)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/vault/external_tests/raft/raft_test.go b/vault/external_tests/raft/raft_test.go
index 15c6e28072..2129bb4df2 100644
--- a/vault/external_tests/raft/raft_test.go
+++ b/vault/external_tests/raft/raft_test.go
@@ -10,7 +10,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"strings"
 	"sync"
@@ -517,7 +516,7 @@ func TestRaft_SnapshotAPI_MidstreamFailure(t *testing.T) {
 
 	var readErr error
 	go func() {
-		snap, readErr = ioutil.ReadAll(r)
+		snap, readErr = io.ReadAll(r)
 		wg.Done()
 	}()
 
@@ -634,7 +633,7 @@ func TestRaft_SnapshotAPI_RekeyRotate_Backward(t *testing.T) {
 			}
 			defer resp.Body.Close()
 
-			snap, err := ioutil.ReadAll(resp.Body)
+			snap, err := io.ReadAll(resp.Body)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -837,7 +836,7 @@ func TestRaft_SnapshotAPI_RekeyRotate_Forward(t *testing.T) {
 				t.Fatal(err)
 			}
 
-			snap, err := ioutil.ReadAll(resp.Body)
+			snap, err := io.ReadAll(resp.Body)
 			resp.Body.Close()
 			if err != nil {
 				t.Fatal(err)
@@ -894,7 +893,7 @@ func TestRaft_SnapshotAPI_RekeyRotate_Forward(t *testing.T) {
 				t.Fatal(err)
 			}
 
-			snap2, err := ioutil.ReadAll(resp.Body)
+			snap2, err := io.ReadAll(resp.Body)
 			resp.Body.Close()
 			if err != nil {
 				t.Fatal(err)
@@ -1024,7 +1023,7 @@ func TestRaft_SnapshotAPI_DifferentCluster(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	snap, err := ioutil.ReadAll(resp.Body)
+	snap, err := io.ReadAll(resp.Body)
 	resp.Body.Close()
 	if err != nil {
 		t.Fatal(err)