diff --git a/app/vmagent/remotewrite/client.go b/app/vmagent/remotewrite/client.go
index c888092a4..06f4f324d 100644
--- a/app/vmagent/remotewrite/client.go
+++ b/app/vmagent/remotewrite/client.go
@@ -3,7 +3,7 @@ package remotewrite
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"strings"
@@ -351,7 +351,7 @@ again:
 	}
 	metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_requests_total{url=%q, status_code="%d"}`, c.sanitizedURL, statusCode)).Inc()
 	if statusCode == 409 || statusCode == 400 {
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		_ = resp.Body.Close()
 		if err != nil {
 			remoteWriteRejectedLogger.Errorf("sending a block with size %d bytes to %q was rejected (skipping the block): status code %d; "+
@@ -375,7 +375,7 @@ again:
 	if retryDuration > time.Minute {
 		retryDuration = time.Minute
 	}
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	_ = resp.Body.Close()
 	if err != nil {
 		logger.Errorf("cannot read response body from %q during retry #%d: %s", c.sanitizedURL, retriesCount, err)
diff --git a/app/vmalert/datasource/vm.go b/app/vmalert/datasource/vm.go
index 189eead00..36547481f 100644
--- a/app/vmalert/datasource/vm.go
+++ b/app/vmalert/datasource/vm.go
@@ -3,7 +3,7 @@ package datasource
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"strings"
@@ -156,7 +156,7 @@ func (s *VMStorage) do(ctx context.Context, req *http.Request) (*http.Response,
 		return nil, fmt.Errorf("error getting response from %s: %w", req.URL.Redacted(), err)
 	}
 	if resp.StatusCode != http.StatusOK {
-		body, _ := ioutil.ReadAll(resp.Body)
+		body, _ := io.ReadAll(resp.Body)
 		_ = resp.Body.Close()
 		return nil, fmt.Errorf("unexpected response code %d for %s. Response body %s", resp.StatusCode, req.URL.Redacted(), body)
 	}
diff --git a/app/vmalert/notifier/alertmanager.go b/app/vmalert/notifier/alertmanager.go
index de6d5c226..14ec932c7 100644
--- a/app/vmalert/notifier/alertmanager.go
+++ b/app/vmalert/notifier/alertmanager.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"strings"
 	"time"
@@ -89,7 +89,7 @@ func (am *AlertManager) send(ctx context.Context, alerts []Alert) error {
 	defer func() { _ = resp.Body.Close() }()
 
 	if resp.StatusCode != http.StatusOK {
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return fmt.Errorf("failed to read response from %q: %w", am.addr, err)
 		}
diff --git a/app/vmalert/remotewrite/remotewrite.go b/app/vmalert/remotewrite/remotewrite.go
index ec5ba98e6..943bba901 100644
--- a/app/vmalert/remotewrite/remotewrite.go
+++ b/app/vmalert/remotewrite/remotewrite.go
@@ -5,7 +5,7 @@ import (
 	"context"
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"path"
 	"strings"
@@ -257,7 +257,7 @@ func (c *Client) send(ctx context.Context, data []byte) error {
 	}
 	defer func() { _ = resp.Body.Close() }()
 	if resp.StatusCode != http.StatusNoContent && resp.StatusCode != http.StatusOK {
-		body, _ := ioutil.ReadAll(resp.Body)
+		body, _ := io.ReadAll(resp.Body)
 		return fmt.Errorf("unexpected response code %d for %s. Response body %q",
 			resp.StatusCode, req.URL.Redacted(), body)
 	}
diff --git a/app/vmalert/remotewrite/remotewrite_test.go b/app/vmalert/remotewrite/remotewrite_test.go
index ed2320262..668c422df 100644
--- a/app/vmalert/remotewrite/remotewrite_test.go
+++ b/app/vmalert/remotewrite/remotewrite_test.go
@@ -3,7 +3,7 @@ package remotewrite
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"math/rand"
 	"net/http"
 	"net/http/httptest"
@@ -96,7 +96,7 @@ func (rw *rwServer) handler(w http.ResponseWriter, r *http.Request) {
 		rw.err(w, fmt.Errorf("header read error: X-Prometheus-Remote-Write-Version is not 0.1.0 (%q)", h))
 	}
 
-	data, err := ioutil.ReadAll(r.Body)
+	data, err := io.ReadAll(r.Body)
 	if err != nil {
 		rw.err(w, fmt.Errorf("body read err: %w", err))
 		return
diff --git a/app/vmctl/opentsdb/opentsdb.go b/app/vmctl/opentsdb/opentsdb.go
index f6700eb8a..bfa6bbcb6 100644
--- a/app/vmctl/opentsdb/opentsdb.go
+++ b/app/vmctl/opentsdb/opentsdb.go
@@ -3,7 +3,7 @@ package opentsdb
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"strings"
@@ -115,7 +115,7 @@ func (c Client) FindMetrics(q string) ([]string, error) {
 		return nil, fmt.Errorf("Bad return from OpenTSDB: %q: %v", resp.StatusCode, resp)
 	}
 	defer func() { _ = resp.Body.Close() }()
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, fmt.Errorf("could not retrieve metric data from %q: %s", q, err)
 	}
@@ -139,7 +139,7 @@ func (c Client) FindSeries(metric string) ([]Meta, error) {
 		return nil, fmt.Errorf("Bad return from OpenTSDB: %q: %v", resp.StatusCode, resp)
 	}
 	defer func() { _ = resp.Body.Close() }()
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, fmt.Errorf("could not retrieve series data from %q: %s", q, err)
 	}
@@ -200,7 +200,7 @@ func (c Client) GetData(series Meta, rt RetentionMeta, start int64, end int64, m
 		return Metric{}, nil
 	}
 	defer func() { _ = resp.Body.Close() }()
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		log.Println("couldn't read response body from OpenTSDB query...skipping")
 		return Metric{}, nil
diff --git a/app/vmctl/vm/vm.go b/app/vmctl/vm/vm.go
index 481258532..50b068211 100644
--- a/app/vmctl/vm/vm.go
+++ b/app/vmctl/vm/vm.go
@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math"
 	"net/http"
 	"strings"
@@ -394,7 +393,7 @@ func do(req *http.Request) error {
 		_ = resp.Body.Close()
 	}()
 	if resp.StatusCode != http.StatusNoContent {
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return fmt.Errorf("failed to read response body for status code %d: %s", resp.StatusCode, err)
 		}
diff --git a/app/vmctl/vm_native.go b/app/vmctl/vm_native.go
index 88d687e3a..3c2105b18 100644
--- a/app/vmctl/vm_native.go
+++ b/app/vmctl/vm_native.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/http"
 
@@ -148,7 +147,7 @@ func (c *vmNativeClient) do(req *http.Request, expSC int) (*http.Response, error
 	}
 
 	if resp.StatusCode != expSC {
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return nil, fmt.Errorf("failed to read response body for status code %d: %s", resp.StatusCode, err)
 		}
diff --git a/lib/awsapi/config.go b/lib/awsapi/config.go
index a86ff7292..706f87526 100644
--- a/lib/awsapi/config.go
+++ b/lib/awsapi/config.go
@@ -4,7 +4,7 @@ import (
 	"encoding/json"
 	"encoding/xml"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"os"
@@ -130,7 +130,7 @@ func (cfg *Config) SignRequest(req *http.Request, payloadHash string) error {
 }
 
 func readResponseBody(resp *http.Response, apiURL string) ([]byte, error) {
-	data, err := ioutil.ReadAll(resp.Body)
+	data, err := io.ReadAll(resp.Body)
 	_ = resp.Body.Close()
 	if err != nil {
 		return nil, fmt.Errorf("cannot read response from %q: %w", apiURL, err)
diff --git a/lib/fs/fs.go b/lib/fs/fs.go
index c638028a2..9dc976f12 100644
--- a/lib/fs/fs.go
+++ b/lib/fs/fs.go
@@ -3,7 +3,6 @@ package fs
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"os"
@@ -383,7 +382,7 @@ func ReadFileOrHTTP(path string) ([]byte, error) {
 		if err != nil {
 			return nil, fmt.Errorf("cannot fetch %q: %w", path, err)
 		}
-		data, err := ioutil.ReadAll(resp.Body)
+		data, err := io.ReadAll(resp.Body)
 		_ = resp.Body.Close()
 		if err != nil {
 			return nil, fmt.Errorf("cannot read %q: %s", path, err)
diff --git a/lib/mergeset/metaindex_row.go b/lib/mergeset/metaindex_row.go
index 3d5b07fe9..c06a4a194 100644
--- a/lib/mergeset/metaindex_row.go
+++ b/lib/mergeset/metaindex_row.go
@@ -3,7 +3,6 @@ package mergeset
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"sort"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
@@ -83,7 +82,7 @@ func (mr *metaindexRow) Unmarshal(src []byte) ([]byte, error) {
 func unmarshalMetaindexRows(dst []metaindexRow, r io.Reader) ([]metaindexRow, error) {
 	// It is ok to read all the metaindex in memory,
 	// since it is quite small.
-	compressedData, err := ioutil.ReadAll(r)
+	compressedData, err := io.ReadAll(r)
 	if err != nil {
 		return dst, fmt.Errorf("cannot read metaindex data: %w", err)
 	}
diff --git a/lib/promscrape/client.go b/lib/promscrape/client.go
index 568dcea63..93df47862 100644
--- a/lib/promscrape/client.go
+++ b/lib/promscrape/client.go
@@ -6,7 +6,6 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"strings"
@@ -198,7 +197,7 @@ func (c *client) GetStreamReader() (*streamReader, error) {
 	}
 	if resp.StatusCode != http.StatusOK {
 		metrics.GetOrCreateCounter(fmt.Sprintf(`vm_promscrape_scrapes_total{status_code="%d"}`, resp.StatusCode)).Inc()
-		respBody, _ := ioutil.ReadAll(resp.Body)
+		respBody, _ := io.ReadAll(resp.Body)
 		_ = resp.Body.Close()
 		cancel()
 		return nil, fmt.Errorf("unexpected status code returned when scraping %q: %d; expecting %d; response body: %q",
diff --git a/lib/promscrape/discovery/gce/api.go b/lib/promscrape/discovery/gce/api.go
index 695fc0842..fdf373901 100644
--- a/lib/promscrape/discovery/gce/api.go
+++ b/lib/promscrape/discovery/gce/api.go
@@ -3,7 +3,7 @@ package gce
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"strings"
@@ -94,7 +94,7 @@ func getAPIResponse(client *http.Client, apiURL, filter, pageToken string) ([]by
 }
 
 func readResponseBody(resp *http.Response, apiURL string) ([]byte, error) {
-	data, err := ioutil.ReadAll(resp.Body)
+	data, err := io.ReadAll(resp.Body)
 	_ = resp.Body.Close()
 	if err != nil {
 		return nil, fmt.Errorf("cannot read response from %q: %w", apiURL, err)
diff --git a/lib/promscrape/discovery/kubernetes/api_watcher.go b/lib/promscrape/discovery/kubernetes/api_watcher.go
index f0689d2e3..ad6ba53a2 100644
--- a/lib/promscrape/discovery/kubernetes/api_watcher.go
+++ b/lib/promscrape/discovery/kubernetes/api_watcher.go
@@ -6,7 +6,6 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"os"
@@ -580,7 +579,7 @@ func (uw *urlWatcher) reloadObjects() string {
 		return ""
 	}
 	if resp.StatusCode != http.StatusOK {
-		body, _ := ioutil.ReadAll(resp.Body)
+		body, _ := io.ReadAll(resp.Body)
 		_ = resp.Body.Close()
 		logger.Errorf("unexpected status code for request to %q: %d; want %d; response: %q", requestURL, resp.StatusCode, http.StatusOK, body)
 		return ""
@@ -676,7 +675,7 @@ func (uw *urlWatcher) watchForUpdates() {
 				uw.staleResourceVersions.Inc()
 				uw.resourceVersion = ""
 			} else {
-				body, _ := ioutil.ReadAll(resp.Body)
+				body, _ := io.ReadAll(resp.Body)
 				_ = resp.Body.Close()
 				logger.Errorf("unexpected status code for request to %q: %d; want %d; response: %q", requestURL, resp.StatusCode, http.StatusOK, body)
 				backoffSleep()
diff --git a/lib/promscrape/discovery/openstack/api.go b/lib/promscrape/discovery/openstack/api.go
index eaa6a0e90..4dbc741ad 100644
--- a/lib/promscrape/discovery/openstack/api.go
+++ b/lib/promscrape/discovery/openstack/api.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"path"
@@ -138,7 +138,7 @@ func getCreds(cfg *apiConfig) (*apiCredentials, error) {
 	if err != nil {
 		return nil, fmt.Errorf("failed query openstack identity api, url: %s, err: %w", apiURL.String(), err)
 	}
-	r, err := ioutil.ReadAll(resp.Body)
+	r, err := io.ReadAll(resp.Body)
 	_ = resp.Body.Close()
 	if err != nil {
 		return nil, fmt.Errorf("cannot read response from %q: %w", apiURL.String(), err)
@@ -168,7 +168,7 @@ func getCreds(cfg *apiConfig) (*apiCredentials, error) {
 
 // readResponseBody reads body from http.Response.
 func readResponseBody(resp *http.Response, apiURL string) ([]byte, error) {
-	data, err := ioutil.ReadAll(resp.Body)
+	data, err := io.ReadAll(resp.Body)
 	_ = resp.Body.Close()
 	if err != nil {
 		return nil, fmt.Errorf("cannot read response from %q: %w", apiURL, err)
diff --git a/lib/promscrape/discovery/yandexcloud/api.go b/lib/promscrape/discovery/yandexcloud/api.go
index 5372b8e17..77591621b 100644
--- a/lib/promscrape/discovery/yandexcloud/api.go
+++ b/lib/promscrape/discovery/yandexcloud/api.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"sync"
@@ -235,7 +235,7 @@ func getAPIResponse(apiURL string, cfg *apiConfig) ([]byte, error) {
 
 // readResponseBody reads body from http.Response.
 func readResponseBody(resp *http.Response, apiURL string) ([]byte, error) {
-	data, err := ioutil.ReadAll(resp.Body)
+	data, err := io.ReadAll(resp.Body)
 	_ = resp.Body.Close()
 	if err != nil {
 		return nil, fmt.Errorf("cannot read response from %q: %w", apiURL, err)
diff --git a/lib/promscrape/scrapework.go b/lib/promscrape/scrapework.go
index c9e1fea7a..ae3dc4d4c 100644
--- a/lib/promscrape/scrapework.go
+++ b/lib/promscrape/scrapework.go
@@ -4,7 +4,7 @@ import (
 	"flag"
 	"fmt"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/auth"
-	"io/ioutil"
+	"io"
 	"math"
 	"math/bits"
 	"strconv"
@@ -406,7 +406,7 @@ func (sw *scrapeWork) getTargetResponse() ([]byte, error) {
 		if err != nil {
 			return nil, err
 		}
-		data, err := ioutil.ReadAll(sr)
+		data, err := io.ReadAll(sr)
 		sr.MustClose()
 		return data, err
 	}
diff --git a/lib/snapshot/snapshot.go b/lib/snapshot/snapshot.go
index ba19ea8e2..b7847fa9b 100644
--- a/lib/snapshot/snapshot.go
+++ b/lib/snapshot/snapshot.go
@@ -4,7 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"regexp"
@@ -34,7 +34,7 @@ func Create(createSnapshotURL string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return "", err
 	}
@@ -72,7 +72,7 @@ func Delete(deleteSnapshotURL string, snapshotName string) error {
 	if err != nil {
 		return err
 	}
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return err
 	}
diff --git a/lib/storage/metaindex_row.go b/lib/storage/metaindex_row.go
index 162bbd94f..2ec257630 100644
--- a/lib/storage/metaindex_row.go
+++ b/lib/storage/metaindex_row.go
@@ -3,7 +3,6 @@ package storage
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"sort"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
@@ -128,7 +127,7 @@ func (mr *metaindexRow) Unmarshal(src []byte) ([]byte, error) {
 }
 
 func unmarshalMetaindexRows(dst []metaindexRow, r io.Reader) ([]metaindexRow, error) {
-	compressedData, err := ioutil.ReadAll(r)
+	compressedData, err := io.ReadAll(r)
 	if err != nil {
 		return dst, fmt.Errorf("cannot read metaindex rows: %w", err)
 	}