diff --git a/server/etcdserver/api/v3rpc/lease.go b/server/etcdserver/api/v3rpc/lease.go
index 86f35113cd99..e03953935b61 100644
--- a/server/etcdserver/api/v3rpc/lease.go
+++ b/server/etcdserver/api/v3rpc/lease.go
@@ -77,7 +77,7 @@ func (ls *LeaseServer) LeaseTimeToLive(ctx context.Context, rr *pb.LeaseTimeToLi
 
 func (ls *LeaseServer) LeaseLeases(ctx context.Context, rr *pb.LeaseLeasesRequest) (*pb.LeaseLeasesResponse, error) {
 	resp, err := ls.le.LeaseLeases(ctx, rr)
-	if err != nil && err != lease.ErrLeaseNotFound {
+	if err != nil && !errors.Is(err, lease.ErrLeaseNotFound) {
 		return nil, togRPCError(err)
 	}
 	if err == lease.ErrLeaseNotFound {
diff --git a/server/etcdserver/api/v3rpc/maintenance.go b/server/etcdserver/api/v3rpc/maintenance.go
index 7ca5d5abbcef..64544b2d1c81 100644
--- a/server/etcdserver/api/v3rpc/maintenance.go
+++ b/server/etcdserver/api/v3rpc/maintenance.go
@@ -17,6 +17,7 @@ package v3rpc
 import (
 	"context"
 	"crypto/sha256"
+	errorspkg "errors"
 	"io"
 	"time"
 
@@ -163,7 +164,7 @@ func (ms *maintenanceServer) Snapshot(sr *pb.SnapshotRequest, srv pb.Maintenance
 		buf := make([]byte, snapshotSendBufferSize)
 
 		n, err := io.ReadFull(pr, buf)
-		if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
+		if err != nil && err != io.EOF && !errorspkg.Is(err, io.ErrUnexpectedEOF) {
 			return togRPCError(err)
 		}
 		sent += int64(n)
diff --git a/server/etcdserver/apply/uber_applier.go b/server/etcdserver/apply/uber_applier.go
index 3c00c60efeef..82b7a6276698 100644
--- a/server/etcdserver/apply/uber_applier.go
+++ b/server/etcdserver/apply/uber_applier.go
@@ -16,6 +16,7 @@ package apply
 
 import (
 	"context"
+	"errors"
 	"time"
 
 	"go.uber.org/zap"
@@ -123,7 +124,7 @@ func (a *uberApplier) dispatch(ctx context.Context, r *pb.InternalRaftRequest) *
 	op := "unknown"
 	ar := &Result{}
 	defer func(start time.Time) {
-		success := ar.Err == nil || ar.Err == mvcc.ErrCompacted
+		success := ar.Err == nil || errors.Is(ar.Err, mvcc.ErrCompacted)
 		txn.ApplySecObserve(v3Version, op, success, time.Since(start))
 		txn.WarnOfExpensiveRequest(a.lg, a.warningApplyDuration, start, &pb.InternalRaftStringer{Request: r}, ar.Resp, ar.Err)
 		if !success {
diff --git a/server/proxy/grpcproxy/health.go b/server/proxy/grpcproxy/health.go
index b4a683242aaf..3bbfa9e2b0fb 100644
--- a/server/proxy/grpcproxy/health.go
+++ b/server/proxy/grpcproxy/health.go
@@ -16,6 +16,7 @@ package grpcproxy
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net/http"
 	"time"
@@ -52,7 +53,7 @@ func checkHealth(c *clientv3.Client) etcdhttp.Health {
 	ctx, cancel := context.WithTimeout(c.Ctx(), time.Second)
 	_, err := c.Get(ctx, "a")
 	cancel()
-	if err == nil || err == rpctypes.ErrPermissionDenied {
+	if err == nil || errors.Is(err, rpctypes.ErrPermissionDenied) {
 		h.Health = "true"
 	} else {
 		h.Reason = fmt.Sprintf("GET ERROR:%s", err)
diff --git a/server/storage/backend/batch_tx.go b/server/storage/backend/batch_tx.go
index 5f9d1f913241..5af557cb4283 100644
--- a/server/storage/backend/batch_tx.go
+++ b/server/storage/backend/batch_tx.go
@@ -16,6 +16,7 @@ package backend
 
 import (
 	"bytes"
+	"errors"
 	"math"
 	"sync"
 	"sync/atomic"
@@ -125,7 +126,7 @@ func (t *batchTx) UnsafeCreateBucket(bucket Bucket) {
 
 func (t *batchTx) UnsafeDeleteBucket(bucket Bucket) {
 	err := t.tx.DeleteBucket(bucket.Name())
-	if err != nil && err != bolterrors.ErrBucketNotFound {
+	if err != nil && !errors.Is(err, bolterrors.ErrBucketNotFound) {
 		t.backend.lg.Fatal(
 			"failed to delete a bucket",
 			zap.Stringer("bucket-name", bucket),
diff --git a/server/storage/storage.go b/server/storage/storage.go
index 21542f9eee2b..99a37a23d071 100644
--- a/server/storage/storage.go
+++ b/server/storage/storage.go
@@ -15,6 +15,7 @@
 package storage
 
 import (
+	"errors"
 	"sync"
 
 	"github.com/coreos/go-semver/semver"
@@ -112,7 +113,7 @@ func (st *storage) MinimalEtcdVersion() *semver.Version {
 	walsnap := walpb.Snapshot{}
 
 	sn, err := st.s.Load()
-	if err != nil && err != snap.ErrNoSnapshot {
+	if err != nil && !errors.Is(err, snap.ErrNoSnapshot) {
 		panic(err)
 	}
 	if sn != nil {
diff --git a/server/storage/wal/wal_test.go b/server/storage/wal/wal_test.go
index ed3a8893df55..5f9d1b169f88 100644
--- a/server/storage/wal/wal_test.go
+++ b/server/storage/wal/wal_test.go
@@ -853,7 +853,7 @@ func TestOpenOnTornWrite(t *testing.T) {
 	p := t.TempDir()
 	w, err := Create(zaptest.NewLogger(t), p, nil)
 	defer func() {
-		if err = w.Close(); err != nil && err != os.ErrInvalid {
+		if err = w.Close(); err != nil && !errors.Is(os.ErrInvalid, err) {
 			t.Fatal(err)
 		}
 	}()