diff --git a/pkg/adt/interval_tree_test.go b/pkg/adt/interval_tree_test.go
index 1e1a05a6452..1e8557078a7 100644
--- a/pkg/adt/interval_tree_test.go
+++ b/pkg/adt/interval_tree_test.go
@@ -18,7 +18,6 @@ import (
 	"math/rand"
 	"reflect"
 	"testing"
-	"time"
 )
 
 // TestIntervalTreeInsert tests interval tree insertion.
@@ -360,7 +359,6 @@ func TestIntervalTreeRandom(t *testing.T) {
 	ivs := make(map[xy]struct{})
 	ivt := NewIntervalTree()
 	maxv := 128
-	rand.Seed(time.Now().UnixNano())
 
 	for i := rand.Intn(maxv) + 1; i != 0; i-- {
 		x, y := int64(rand.Intn(maxv)), int64(rand.Intn(maxv))
diff --git a/pkg/proxy/server.go b/pkg/proxy/server.go
index 72a0c7483d2..96f30bd7d4a 100644
--- a/pkg/proxy/server.go
+++ b/pkg/proxy/server.go
@@ -806,7 +806,6 @@ func computeLatency(lat, rv time.Duration) time.Duration {
 		rv = lat / 10
 	}
 	now := time.Now()
-	mrand.Seed(int64(now.Nanosecond()))
 	sign := 1
 	if now.Second()%2 == 0 {
 		sign = -1
diff --git a/pkg/proxy/server_test.go b/pkg/proxy/server_test.go
index 6690c619d11..d19c947c646 100644
--- a/pkg/proxy/server_test.go
+++ b/pkg/proxy/server_test.go
@@ -628,7 +628,6 @@ func testServerHTTP(t *testing.T, secure, delayTx bool) {
 
 func newUnixAddr() string {
 	now := time.Now().UnixNano()
-	rand.Seed(now)
 	addr := fmt.Sprintf("%X%X.unix-conn", now, rand.Intn(35000))
 	os.RemoveAll(addr)
 	return addr
diff --git a/pkg/stringutil/rand.go b/pkg/stringutil/rand.go
index 96d9df311cf..347ee7c2b46 100644
--- a/pkg/stringutil/rand.go
+++ b/pkg/stringutil/rand.go
@@ -16,7 +16,6 @@ package stringutil
 
 import (
 	"math/rand"
-	"time"
 )
 
 // UniqueStrings returns a slice of randomly generated unique strings.
@@ -45,7 +44,6 @@ func RandomStrings(slen uint, n int) (ss []string) {
 const chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
 
 func RandString(l uint) string {
-	rand.Seed(time.Now().UnixNano())
 	s := make([]byte, l)
 	for i := 0; i < int(l); i++ {
 		s[i] = chars[rand.Intn(len(chars))]
diff --git a/server/etcdserver/server.go b/server/etcdserver/server.go
index 4a2128104c9..b18c1cce74e 100644
--- a/server/etcdserver/server.go
+++ b/server/etcdserver/server.go
@@ -20,7 +20,6 @@ import (
 	"expvar"
 	"fmt"
 	"math"
-	"math/rand"
 	"net/http"
 	"path"
 	"regexp"
@@ -120,8 +119,6 @@ var (
 )
 
 func init() {
-	rand.Seed(time.Now().UnixNano())
-
 	expvar.Publish(
 		"file_descriptor_limit",
 		expvar.Func(
diff --git a/server/lease/lessor_bench_test.go b/server/lease/lessor_bench_test.go
index 71e970e5f25..73cdbede30d 100644
--- a/server/lease/lessor_bench_test.go
+++ b/server/lease/lessor_bench_test.go
@@ -37,10 +37,6 @@ func BenchmarkLessorRenew100000(b *testing.B) { benchmarkLessorRenew(100000, b)
 func BenchmarkLessorFindExpired10000(b *testing.B)  { benchmarkLessorFindExpired(10000, b) }
 func BenchmarkLessorFindExpired100000(b *testing.B) { benchmarkLessorFindExpired(100000, b) }
 
-func init() {
-	rand.Seed(time.Now().UTC().UnixNano())
-}
-
 const (
 	// minTTL keep lease will not auto expire in benchmark
 	minTTL = 1000
diff --git a/tests/integration/clientv3/snapshot/v3_snapshot_test.go b/tests/integration/clientv3/snapshot/v3_snapshot_test.go
index 01115d04ba0..5f4fb2adc8d 100644
--- a/tests/integration/clientv3/snapshot/v3_snapshot_test.go
+++ b/tests/integration/clientv3/snapshot/v3_snapshot_test.go
@@ -130,7 +130,6 @@ func createSnapshotFile(t *testing.T, cfg *embed.Config, kvs []kv) (version stri
 func newEmbedURLs(n int) (urls []url.URL) {
 	urls = make([]url.URL, n)
 	for i := 0; i < n; i++ {
-		rand.Seed(int64(time.Now().Nanosecond()))
 		u, _ := url.Parse(fmt.Sprintf("unix://localhost:%d", rand.Intn(45000)))
 		urls[i] = *u
 	}