diff --git a/accounts/keystore/account_cache_test.go b/accounts/keystore/account_cache_test.go
index 01db587d15..aa71c12018 100644
--- a/accounts/keystore/account_cache_test.go
+++ b/accounts/keystore/account_cache_test.go
@@ -113,7 +113,6 @@ func TestWatchNewFile(t *testing.T) {
 func TestWatchNoDir(t *testing.T) {
 	t.Parallel()
 	// Create ks but not the directory that it watches.
-	rand.Seed(time.Now().UnixNano())
 	dir := filepath.Join(os.TempDir(), fmt.Sprintf("eth-keystore-watchnodir-test-%d-%d", os.Getpid(), rand.Int()))
 	ks := NewKeyStore(dir, LightScryptN, LightScryptP)
 	list := ks.Accounts()
@@ -322,7 +321,6 @@ func TestUpdatedKeyfileContents(t *testing.T) {
 	t.Parallel()
 
 	// Create a temporary keystore to test with
-	rand.Seed(time.Now().UnixNano())
 	dir := filepath.Join(os.TempDir(), fmt.Sprintf("eth-keystore-updatedkeyfilecontents-test-%d-%d", os.Getpid(), rand.Int()))
 	ks := NewKeyStore(dir, LightScryptN, LightScryptP)
 
diff --git a/common/lru/basiclru_test.go b/common/lru/basiclru_test.go
index 68e13bfc92..e2d3559f55 100644
--- a/common/lru/basiclru_test.go
+++ b/common/lru/basiclru_test.go
@@ -17,6 +17,7 @@
 package lru
 
 import (
+	crand "crypto/rand"
 	"fmt"
 	"io"
 	"math/rand"
@@ -181,9 +182,9 @@ func BenchmarkLRU(b *testing.B) {
 	}
 	for i := range keys {
 		b := make([]byte, 32)
-		rand.Read(b)
+		crand.Read(b)
 		keys[i] = string(b)
-		rand.Read(b)
+		crand.Read(b)
 		values[i] = b
 	}
 
diff --git a/common/prque/lazyqueue_test.go b/common/prque/lazyqueue_test.go
index 9a831d628b..ffb7e5e9e3 100644
--- a/common/prque/lazyqueue_test.go
+++ b/common/prque/lazyqueue_test.go
@@ -56,7 +56,6 @@ func testSetIndex(a interface{}, i int) {
 }
 
 func TestLazyQueue(t *testing.T) {
-	rand.Seed(time.Now().UnixNano())
 	clock := &mclock.Simulated{}
 	q := NewLazyQueue(testSetIndex, testPriority, testMaxPriority, clock, testQueueRefresh)
 
diff --git a/consensus/ethash/consensus_test.go b/consensus/ethash/consensus_test.go
index db997d737e..e3793cd1b0 100644
--- a/consensus/ethash/consensus_test.go
+++ b/consensus/ethash/consensus_test.go
@@ -17,6 +17,7 @@
 package ethash
 
 import (
+	crand "crypto/rand"
 	"encoding/binary"
 	"encoding/json"
 	"math/big"
@@ -90,16 +91,15 @@ func TestCalcDifficulty(t *testing.T) {
 
 func randSlice(min, max uint32) []byte {
 	var b = make([]byte, 4)
-	rand.Read(b)
+	crand.Read(b)
 	a := binary.LittleEndian.Uint32(b)
 	size := min + a%(max-min)
 	out := make([]byte, size)
-	rand.Read(out)
+	crand.Read(out)
 	return out
 }
 
 func TestDifficultyCalculators(t *testing.T) {
-	rand.Seed(2)
 	for i := 0; i < 5000; i++ {
 		// 1 to 300 seconds diff
 		var timeDelta = uint64(1 + rand.Uint32()%3000)
diff --git a/core/bloombits/generator_test.go b/core/bloombits/generator_test.go
index 883948d12b..ac1aee0b25 100644
--- a/core/bloombits/generator_test.go
+++ b/core/bloombits/generator_test.go
@@ -18,6 +18,7 @@ package bloombits
 
 import (
 	"bytes"
+	crand "crypto/rand"
 	"math/rand"
 	"testing"
 
@@ -78,7 +79,7 @@ func BenchmarkGenerator(b *testing.B) {
 		}
 	})
 	for i := 0; i < types.BloomBitLength; i++ {
-		rand.Read(input[i][:])
+		crand.Read(input[i][:])
 	}
 	b.Run("random", func(b *testing.B) {
 		b.ReportAllocs()
diff --git a/core/rawdb/freezer_table_test.go b/core/rawdb/freezer_table_test.go
index ea28e71756..6181d4d72c 100644
--- a/core/rawdb/freezer_table_test.go
+++ b/core/rawdb/freezer_table_test.go
@@ -27,17 +27,12 @@ import (
 	"sync/atomic"
 	"testing"
 	"testing/quick"
-	"time"
 
 	"github.com/davecgh/go-spew/spew"
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/stretchr/testify/require"
 )
 
-func init() {
-	rand.Seed(time.Now().Unix())
-}
-
 // TestFreezerBasics test initializing a freezertable from scratch, writing to the table,
 // and reading it back.
 func TestFreezerBasics(t *testing.T) {
diff --git a/core/state/snapshot/difflayer_test.go b/core/state/snapshot/difflayer_test.go
index 59db920481..674a031b16 100644
--- a/core/state/snapshot/difflayer_test.go
+++ b/core/state/snapshot/difflayer_test.go
@@ -18,6 +18,7 @@ package snapshot
 
 import (
 	"bytes"
+	crand "crypto/rand"
 	"math/rand"
 	"testing"
 
@@ -73,7 +74,7 @@ func TestMergeBasics(t *testing.T) {
 		if rand.Intn(2) == 0 {
 			accStorage := make(map[common.Hash][]byte)
 			value := make([]byte, 32)
-			rand.Read(value)
+			crand.Read(value)
 			accStorage[randomHash()] = value
 			storage[h] = accStorage
 		}
@@ -294,7 +295,7 @@ func BenchmarkSearchSlot(b *testing.B) {
 		accStorage := make(map[common.Hash][]byte)
 		for i := 0; i < 5; i++ {
 			value := make([]byte, 32)
-			rand.Read(value)
+			crand.Read(value)
 			accStorage[randomHash()] = value
 			storage[accountKey] = accStorage
 		}
@@ -330,7 +331,7 @@ func BenchmarkFlatten(b *testing.B) {
 			accStorage := make(map[common.Hash][]byte)
 			for i := 0; i < 20; i++ {
 				value := make([]byte, 32)
-				rand.Read(value)
+				crand.Read(value)
 				accStorage[randomHash()] = value
 			}
 			storage[accountKey] = accStorage
@@ -379,7 +380,7 @@ func BenchmarkJournal(b *testing.B) {
 			accStorage := make(map[common.Hash][]byte)
 			for i := 0; i < 200; i++ {
 				value := make([]byte, 32)
-				rand.Read(value)
+				crand.Read(value)
 				accStorage[randomHash()] = value
 			}
 			storage[accountKey] = accStorage
diff --git a/core/state/snapshot/iterator_test.go b/core/state/snapshot/iterator_test.go
index 7420a2dc22..54614427a5 100644
--- a/core/state/snapshot/iterator_test.go
+++ b/core/state/snapshot/iterator_test.go
@@ -18,6 +18,7 @@ package snapshot
 
 import (
 	"bytes"
+	crand "crypto/rand"
 	"encoding/binary"
 	"fmt"
 	"math/rand"
@@ -47,7 +48,7 @@ func TestAccountIteratorBasics(t *testing.T) {
 		if rand.Intn(2) == 0 {
 			accStorage := make(map[common.Hash][]byte)
 			value := make([]byte, 32)
-			rand.Read(value)
+			crand.Read(value)
 			accStorage[randomHash()] = value
 			storage[h] = accStorage
 		}
@@ -79,7 +80,7 @@ func TestStorageIteratorBasics(t *testing.T) {
 
 		var nilstorage int
 		for i := 0; i < 100; i++ {
-			rand.Read(value)
+			crand.Read(value)
 			if rand.Intn(2) == 0 {
 				accStorage[randomHash()] = common.CopyBytes(value)
 			} else {
diff --git a/core/state/snapshot/snapshot_test.go b/core/state/snapshot/snapshot_test.go
index bbb2650aaf..82833873cb 100644
--- a/core/state/snapshot/snapshot_test.go
+++ b/core/state/snapshot/snapshot_test.go
@@ -17,6 +17,7 @@
 package snapshot
 
 import (
+	crand "crypto/rand"
 	"encoding/binary"
 	"fmt"
 	"math/big"
@@ -33,7 +34,7 @@ import (
 // randomHash generates a random blob of data and returns it as a hash.
 func randomHash() common.Hash {
 	var hash common.Hash
-	if n, err := rand.Read(hash[:]); n != common.HashLength || err != nil {
+	if n, err := crand.Read(hash[:]); n != common.HashLength || err != nil {
 		panic(err)
 	}
 	return hash
diff --git a/core/txpool/txpool_test.go b/core/txpool/txpool_test.go
index 7aa016ab41..bd82622f8d 100644
--- a/core/txpool/txpool_test.go
+++ b/core/txpool/txpool_test.go
@@ -18,6 +18,7 @@ package txpool
 
 import (
 	"crypto/ecdsa"
+	crand "crypto/rand"
 	"errors"
 	"fmt"
 	"math/big"
@@ -92,7 +93,7 @@ func pricedTransaction(nonce uint64, gaslimit uint64, gasprice *big.Int, key *ec
 
 func pricedDataTransaction(nonce uint64, gaslimit uint64, gasprice *big.Int, key *ecdsa.PrivateKey, bytes uint64) *types.Transaction {
 	data := make([]byte, bytes)
-	rand.Read(data)
+	crand.Read(data)
 
 	tx, _ := types.SignTx(types.NewTransaction(nonce, common.Address{}, big.NewInt(0), gaslimit, gasprice, data), types.HomesteadSigner{}, key)
 	return tx
diff --git a/crypto/signify/signify_test.go b/crypto/signify/signify_test.go
index ba85d2fc43..9bac2c825f 100644
--- a/crypto/signify/signify_test.go
+++ b/crypto/signify/signify_test.go
@@ -20,10 +20,9 @@
 package signify
 
 import (
-	"math/rand"
+	"crypto/rand"
 	"os"
 	"testing"
-	"time"
 
 	"github.com/jedisct1/go-minisign"
 )
@@ -41,8 +40,6 @@ func TestSignify(t *testing.T) {
 	defer os.Remove(tmpFile.Name())
 	defer tmpFile.Close()
 
-	rand.Seed(time.Now().UnixNano())
-
 	data := make([]byte, 1024)
 	rand.Read(data)
 	tmpFile.Write(data)
@@ -85,8 +82,6 @@ func TestSignifyTrustedCommentTooManyLines(t *testing.T) {
 	defer os.Remove(tmpFile.Name())
 	defer tmpFile.Close()
 
-	rand.Seed(time.Now().UnixNano())
-
 	data := make([]byte, 1024)
 	rand.Read(data)
 	tmpFile.Write(data)
@@ -110,8 +105,6 @@ func TestSignifyTrustedCommentTooManyLinesLF(t *testing.T) {
 	defer os.Remove(tmpFile.Name())
 	defer tmpFile.Close()
 
-	rand.Seed(time.Now().UnixNano())
-
 	data := make([]byte, 1024)
 	rand.Read(data)
 	tmpFile.Write(data)
@@ -135,8 +128,6 @@ func TestSignifyTrustedCommentEmpty(t *testing.T) {
 	defer os.Remove(tmpFile.Name())
 	defer tmpFile.Close()
 
-	rand.Seed(time.Now().UnixNano())
-
 	data := make([]byte, 1024)
 	rand.Read(data)
 	tmpFile.Write(data)
diff --git a/ethdb/dbtest/testsuite.go b/ethdb/dbtest/testsuite.go
index 06a2d330db..e455215cb0 100644
--- a/ethdb/dbtest/testsuite.go
+++ b/ethdb/dbtest/testsuite.go
@@ -18,7 +18,7 @@ package dbtest
 
 import (
 	"bytes"
-	"math/rand"
+	"crypto/rand"
 	"reflect"
 	"sort"
 	"testing"
diff --git a/event/event_test.go b/event/event_test.go
index bdad11f13d..84b37eca3b 100644
--- a/event/event_test.go
+++ b/event/event_test.go
@@ -100,7 +100,6 @@ func TestSubscribeDuplicateType(t *testing.T) {
 }
 
 func TestMuxConcurrent(t *testing.T) {
-	rand.Seed(time.Now().Unix())
 	mux := new(TypeMux)
 	defer mux.Stop()
 
diff --git a/les/api_test.go b/les/api_test.go
index 3db1c5fd5e..db680da0bf 100644
--- a/les/api_test.go
+++ b/les/api_test.go
@@ -18,6 +18,7 @@ package les
 
 import (
 	"context"
+	crand "crypto/rand"
 	"errors"
 	"flag"
 	"math/rand"
@@ -326,7 +327,7 @@ func getHead(ctx context.Context, t *testing.T, client *rpc.Client) (uint64, com
 func testRequest(ctx context.Context, t *testing.T, client *rpc.Client) bool {
 	var res string
 	var addr common.Address
-	rand.Read(addr[:])
+	crand.Read(addr[:])
 	c, cancel := context.WithTimeout(ctx, time.Second*12)
 	defer cancel()
 	err := client.CallContext(c, &res, "eth_getBalance", addr, "latest")
diff --git a/les/benchmark.go b/les/benchmark.go
index 757822a6b3..95563a21aa 100644
--- a/les/benchmark.go
+++ b/les/benchmark.go
@@ -17,6 +17,7 @@
 package les
 
 import (
+	crand "crypto/rand"
 	"encoding/binary"
 	"fmt"
 	"math/big"
@@ -114,7 +115,7 @@ func (b *benchmarkProofsOrCode) init(h *serverHandler, count int) error {
 
 func (b *benchmarkProofsOrCode) request(peer *serverPeer, index int) error {
 	key := make([]byte, 32)
-	rand.Read(key)
+	crand.Read(key)
 	if b.code {
 		return peer.requestCode(0, []CodeReq{{BHash: b.headHash, AccKey: key}})
 	}
@@ -176,7 +177,7 @@ func (b *benchmarkTxSend) init(h *serverHandler, count int) error {
 
 	for i := range b.txs {
 		data := make([]byte, txSizeCostLimit)
-		rand.Read(data)
+		crand.Read(data)
 		tx, err := types.SignTx(types.NewTransaction(0, addr, new(big.Int), 0, new(big.Int), data), signer, key)
 		if err != nil {
 			panic(err)
@@ -200,7 +201,7 @@ func (b *benchmarkTxStatus) init(h *serverHandler, count int) error {
 
 func (b *benchmarkTxStatus) request(peer *serverPeer, index int) error {
 	var hash common.Hash
-	rand.Read(hash[:])
+	crand.Read(hash[:])
 	return peer.requestTxStatus(0, []common.Hash{hash})
 }
 
@@ -278,7 +279,7 @@ func (h *serverHandler) measure(setup *benchmarkSetup, count int) error {
 	clientMeteredPipe := &meteredPipe{rw: clientPipe}
 	serverMeteredPipe := &meteredPipe{rw: serverPipe}
 	var id enode.ID
-	rand.Read(id[:])
+	crand.Read(id[:])
 
 	peer1 := newServerPeer(lpv2, NetworkId, false, p2p.NewPeer(id, "client", nil), clientMeteredPipe)
 	peer2 := newClientPeer(lpv2, NetworkId, p2p.NewPeer(id, "server", nil), serverMeteredPipe)
diff --git a/les/utils/limiter_test.go b/les/utils/limiter_test.go
index 3fbdc60d7c..c031b21de5 100644
--- a/les/utils/limiter_test.go
+++ b/les/utils/limiter_test.go
@@ -17,7 +17,7 @@
 package utils
 
 import (
-	"math/rand"
+	"crypto/rand"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/p2p/enode"
diff --git a/les/vflux/client/fillset_test.go b/les/vflux/client/fillset_test.go
index ddb12a82f9..652dcf9f62 100644
--- a/les/vflux/client/fillset_test.go
+++ b/les/vflux/client/fillset_test.go
@@ -17,7 +17,7 @@
 package client
 
 import (
-	"math/rand"
+	"crypto/rand"
 	"testing"
 	"time"
 
diff --git a/les/vflux/server/clientpool_test.go b/les/vflux/server/clientpool_test.go
index 790ec51360..f75c70afca 100644
--- a/les/vflux/server/clientpool_test.go
+++ b/les/vflux/server/clientpool_test.go
@@ -135,7 +135,6 @@ func alwaysTrueFn() bool {
 }
 
 func testClientPool(t *testing.T, activeLimit, clientCount, paidCount int, randomDisconnect bool) {
-	rand.Seed(time.Now().UnixNano())
 	var (
 		clock     mclock.Simulated
 		db        = rawdb.NewMemoryDatabase()
diff --git a/metrics/sample.go b/metrics/sample.go
index fa2bfb274e..afcaa21184 100644
--- a/metrics/sample.go
+++ b/metrics/sample.go
@@ -41,6 +41,7 @@ type ExpDecaySample struct {
 	reservoirSize int
 	t0, t1        time.Time
 	values        *expDecaySampleHeap
+	rand          *rand.Rand
 }
 
 // NewExpDecaySample constructs a new exponentially-decaying sample with the
@@ -59,6 +60,12 @@ func NewExpDecaySample(reservoirSize int, alpha float64) Sample {
 	return s
 }
 
+// SetRand sets the random source (useful in tests)
+func (s *ExpDecaySample) SetRand(prng *rand.Rand) Sample {
+	s.rand = prng
+	return s
+}
+
 // Clear clears all samples.
 func (s *ExpDecaySample) Clear() {
 	s.mutex.Lock()
@@ -168,8 +175,14 @@ func (s *ExpDecaySample) update(t time.Time, v int64) {
 	if s.values.Size() == s.reservoirSize {
 		s.values.Pop()
 	}
+	var f64 float64
+	if s.rand != nil {
+		f64 = s.rand.Float64()
+	} else {
+		f64 = rand.Float64()
+	}
 	s.values.Push(expDecaySample{
-		k: math.Exp(t.Sub(s.t0).Seconds()*s.alpha) / rand.Float64(),
+		k: math.Exp(t.Sub(s.t0).Seconds()*s.alpha) / f64,
 		v: v,
 	})
 	if t.After(s.t1) {
@@ -402,6 +415,7 @@ type UniformSample struct {
 	mutex         sync.Mutex
 	reservoirSize int
 	values        []int64
+	rand          *rand.Rand
 }
 
 // NewUniformSample constructs a new uniform sample with the given reservoir
@@ -416,6 +430,12 @@ func NewUniformSample(reservoirSize int) Sample {
 	}
 }
 
+// SetRand sets the random source (useful in tests)
+func (s *UniformSample) SetRand(prng *rand.Rand) Sample {
+	s.rand = prng
+	return s
+}
+
 // Clear clears all samples.
 func (s *UniformSample) Clear() {
 	s.mutex.Lock()
@@ -511,7 +531,12 @@ func (s *UniformSample) Update(v int64) {
 	if len(s.values) < s.reservoirSize {
 		s.values = append(s.values, v)
 	} else {
-		r := rand.Int63n(s.count)
+		var r int64
+		if s.rand != nil {
+			r = s.rand.Int63n(s.count)
+		} else {
+			r = rand.Int63n(s.count)
+		}
 		if r < int64(len(s.values)) {
 			s.values[int(r)] = v
 		}
diff --git a/metrics/sample_test.go b/metrics/sample_test.go
index c9168d3e82..3ae128d56f 100644
--- a/metrics/sample_test.go
+++ b/metrics/sample_test.go
@@ -80,7 +80,6 @@ func BenchmarkUniformSample1028(b *testing.B) {
 }
 
 func TestExpDecaySample10(t *testing.T) {
-	rand.Seed(1)
 	s := NewExpDecaySample(100, 0.99)
 	for i := 0; i < 10; i++ {
 		s.Update(int64(i))
@@ -102,7 +101,6 @@ func TestExpDecaySample10(t *testing.T) {
 }
 
 func TestExpDecaySample100(t *testing.T) {
-	rand.Seed(1)
 	s := NewExpDecaySample(1000, 0.01)
 	for i := 0; i < 100; i++ {
 		s.Update(int64(i))
@@ -124,7 +122,6 @@ func TestExpDecaySample100(t *testing.T) {
 }
 
 func TestExpDecaySample1000(t *testing.T) {
-	rand.Seed(1)
 	s := NewExpDecaySample(100, 0.99)
 	for i := 0; i < 1000; i++ {
 		s.Update(int64(i))
@@ -150,7 +147,6 @@ func TestExpDecaySample1000(t *testing.T) {
 // The priority becomes +Inf quickly after starting if this is done,
 // effectively freezing the set of samples until a rescale step happens.
 func TestExpDecaySampleNanosecondRegression(t *testing.T) {
-	rand.Seed(1)
 	s := NewExpDecaySample(100, 0.99)
 	for i := 0; i < 100; i++ {
 		s.Update(10)
@@ -183,8 +179,7 @@ func TestExpDecaySampleRescale(t *testing.T) {
 
 func TestExpDecaySampleSnapshot(t *testing.T) {
 	now := time.Now()
-	rand.Seed(1)
-	s := NewExpDecaySample(100, 0.99)
+	s := NewExpDecaySample(100, 0.99).(*ExpDecaySample).SetRand(rand.New(rand.NewSource(1)))
 	for i := 1; i <= 10000; i++ {
 		s.(*ExpDecaySample).update(now.Add(time.Duration(i)), int64(i))
 	}
@@ -195,8 +190,7 @@ func TestExpDecaySampleSnapshot(t *testing.T) {
 
 func TestExpDecaySampleStatistics(t *testing.T) {
 	now := time.Now()
-	rand.Seed(1)
-	s := NewExpDecaySample(100, 0.99)
+	s := NewExpDecaySample(100, 0.99).(*ExpDecaySample).SetRand(rand.New(rand.NewSource(1)))
 	for i := 1; i <= 10000; i++ {
 		s.(*ExpDecaySample).update(now.Add(time.Duration(i)), int64(i))
 	}
@@ -204,7 +198,6 @@ func TestExpDecaySampleStatistics(t *testing.T) {
 }
 
 func TestUniformSample(t *testing.T) {
-	rand.Seed(1)
 	s := NewUniformSample(100)
 	for i := 0; i < 1000; i++ {
 		s.Update(int64(i))
@@ -226,7 +219,6 @@ func TestUniformSample(t *testing.T) {
 }
 
 func TestUniformSampleIncludesTail(t *testing.T) {
-	rand.Seed(1)
 	s := NewUniformSample(100)
 	max := 100
 	for i := 0; i < max; i++ {
@@ -244,7 +236,7 @@ func TestUniformSampleIncludesTail(t *testing.T) {
 }
 
 func TestUniformSampleSnapshot(t *testing.T) {
-	s := NewUniformSample(100)
+	s := NewUniformSample(100).(*UniformSample).SetRand(rand.New(rand.NewSource(1)))
 	for i := 1; i <= 10000; i++ {
 		s.Update(int64(i))
 	}
@@ -254,8 +246,7 @@ func TestUniformSampleSnapshot(t *testing.T) {
 }
 
 func TestUniformSampleStatistics(t *testing.T) {
-	rand.Seed(1)
-	s := NewUniformSample(100)
+	s := NewUniformSample(100).(*UniformSample).SetRand(rand.New(rand.NewSource(1)))
 	for i := 1; i <= 10000; i++ {
 		s.Update(int64(i))
 	}
diff --git a/miner/stress/1559/main.go b/miner/stress/1559/main.go
index abc24f4a36..c27875000d 100644
--- a/miner/stress/1559/main.go
+++ b/miner/stress/1559/main.go
@@ -19,6 +19,7 @@ package main
 
 import (
 	"crypto/ecdsa"
+	crand "crypto/rand"
 	"math/big"
 	"math/rand"
 	"os"
@@ -162,7 +163,7 @@ func makeTransaction(nonce uint64, privKey *ecdsa.PrivateKey, signer types.Signe
 	// Feecap and feetip are limited to 32 bytes. Offer a sightly
 	// larger buffer for creating both valid and invalid transactions.
 	var buf = make([]byte, 32+5)
-	rand.Read(buf)
+	crand.Read(buf)
 	gasTipCap := new(big.Int).SetBytes(buf)
 
 	// If the given base fee is nil(the 1559 is still not available),
@@ -173,7 +174,7 @@ func makeTransaction(nonce uint64, privKey *ecdsa.PrivateKey, signer types.Signe
 	// Generate the feecap, 75% valid feecap and 25% unguaranteed.
 	var gasFeeCap *big.Int
 	if rand.Intn(4) == 0 {
-		rand.Read(buf)
+		crand.Read(buf)
 		gasFeeCap = new(big.Int).SetBytes(buf)
 	} else {
 		gasFeeCap = new(big.Int).Add(baseFee, gasTipCap)
diff --git a/miner/worker_test.go b/miner/worker_test.go
index a3f46db17c..ba929d293d 100644
--- a/miner/worker_test.go
+++ b/miner/worker_test.go
@@ -17,9 +17,9 @@
 package miner
 
 import (
+	"crypto/rand"
 	"errors"
 	"math/big"
-	"math/rand"
 	"sync/atomic"
 	"testing"
 	"time"
@@ -105,8 +105,6 @@ func init() {
 		GasPrice: big.NewInt(params.InitialBaseFee),
 	})
 	newTxs = append(newTxs, tx2)
-
-	rand.Seed(time.Now().UnixNano())
 }
 
 // testWorkerBackend implements worker.Backend interfaces and wraps all information needed during the testing.
diff --git a/p2p/discover/v4_udp_test.go b/p2p/discover/v4_udp_test.go
index f4fd9b246f..21f0d75172 100644
--- a/p2p/discover/v4_udp_test.go
+++ b/p2p/discover/v4_udp_test.go
@@ -165,7 +165,6 @@ func TestUDPv4_responseTimeouts(t *testing.T) {
 	test := newUDPTest(t)
 	defer test.close()
 
-	rand.Seed(time.Now().UnixNano())
 	randomDuration := func(max time.Duration) time.Duration {
 		return time.Duration(rand.Int63n(int64(max)))
 	}
diff --git a/p2p/enode/localnode_test.go b/p2p/enode/localnode_test.go
index 312df813bb..7f97ad392f 100644
--- a/p2p/enode/localnode_test.go
+++ b/p2p/enode/localnode_test.go
@@ -17,7 +17,7 @@
 package enode
 
 import (
-	"math/rand"
+	"crypto/rand"
 	"net"
 	"testing"
 
diff --git a/p2p/netutil/iptrack_test.go b/p2p/netutil/iptrack_test.go
index a9a2998a65..ee3bba861e 100644
--- a/p2p/netutil/iptrack_test.go
+++ b/p2p/netutil/iptrack_test.go
@@ -17,8 +17,8 @@
 package netutil
 
 import (
+	crand "crypto/rand"
 	"fmt"
-	mrand "math/rand"
 	"testing"
 	"time"
 
@@ -123,8 +123,8 @@ func TestIPTrackerForceGC(t *testing.T) {
 	for i := 0; i < 5*max; i++ {
 		e1 := make([]byte, 4)
 		e2 := make([]byte, 4)
-		mrand.Read(e1)
-		mrand.Read(e2)
+		crand.Read(e1)
+		crand.Read(e2)
 		it.AddStatement(string(e1), string(e2))
 		it.AddContact(string(e1))
 		clock.Run(rate)
diff --git a/trie/encoding_test.go b/trie/encoding_test.go
index e8fe4f3c6b..d16d25c359 100644
--- a/trie/encoding_test.go
+++ b/trie/encoding_test.go
@@ -18,6 +18,7 @@ package trie
 
 import (
 	"bytes"
+	crand "crypto/rand"
 	"encoding/hex"
 	"math/rand"
 	"testing"
@@ -97,7 +98,7 @@ func TestHexToCompactInPlaceRandom(t *testing.T) {
 	for i := 0; i < 10000; i++ {
 		l := rand.Intn(128)
 		key := make([]byte, l)
-		rand.Read(key)
+		crand.Read(key)
 		hexBytes := keybytesToHex(key)
 		hexOrig := []byte(string(hexBytes))
 		exp := hexToCompact(hexBytes)
diff --git a/trie/proof_test.go b/trie/proof_test.go
index 61667b20ab..5796a30893 100644
--- a/trie/proof_test.go
+++ b/trie/proof_test.go
@@ -23,7 +23,6 @@ import (
 	mrand "math/rand"
 	"sort"
 	"testing"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/rawdb"
@@ -31,10 +30,6 @@ import (
 	"github.com/ethereum/go-ethereum/ethdb/memorydb"
 )
 
-func init() {
-	mrand.Seed(time.Now().Unix())
-}
-
 // makeProvers creates Merkle trie provers based on different implementations to
 // test all variations.
 func makeProvers(trie *Trie) []func(key []byte) *memorydb.Database {
diff --git a/trie/trie_test.go b/trie/trie_test.go
index ece19fdff1..2fb97eebbf 100644
--- a/trie/trie_test.go
+++ b/trie/trie_test.go
@@ -18,6 +18,7 @@ package trie
 
 import (
 	"bytes"
+	crand "crypto/rand"
 	"encoding/binary"
 	"errors"
 	"fmt"
@@ -1127,8 +1128,8 @@ func TestDecodeNode(t *testing.T) {
 		elems = make([]byte, 20)
 	)
 	for i := 0; i < 5000000; i++ {
-		rand.Read(hash)
-		rand.Read(elems)
+		crand.Read(hash)
+		crand.Read(elems)
 		decodeNode(hash, elems)
 	}
 }