diff --git a/tests/common/member_test.go b/tests/common/member_test.go
index 1efb95039a6..27c5cb4cc51 100644
--- a/tests/common/member_test.go
+++ b/tests/common/member_test.go
@@ -113,6 +113,8 @@ func TestMemberAdd(t *testing.T) {
 		for _, quorumTc := range quorumTcs {
 			for _, clusterTc := range clusterTestCases() {
 				t.Run(learnerTc.name+"/"+quorumTc.name+"/"+clusterTc.name, func(t *testing.T) {
+					t.Parallel()
+
 					ctxTimeout := 10 * time.Second
 					if quorumTc.waitForQuorum {
 						ctxTimeout += etcdserver.HealthInterval
diff --git a/tests/framework/e2e/e2e.go b/tests/framework/e2e/e2e.go
index f78df57926e..3d22b5c88de 100644
--- a/tests/framework/e2e/e2e.go
+++ b/tests/framework/e2e/e2e.go
@@ -17,6 +17,7 @@ package e2e
 import (
 	"context"
 	"os"
+	"sync/atomic"
 	"testing"
 
 	"go.etcd.io/etcd/client/pkg/v3/testutil"
@@ -24,6 +25,8 @@ import (
 	intf "go.etcd.io/etcd/tests/v3/framework/interfaces"
 )
 
+var uniqueBasePort int32 = 20000
+
 type e2eRunner struct{}
 
 func NewE2eRunner() intf.TestRunner {
@@ -83,6 +86,7 @@ func (e e2eRunner) NewCluster(ctx context.Context, t testing.TB, opts ...config.
 	default:
 		t.Fatalf("PeerTLS config %q not supported", cfg.PeerTLS)
 	}
+	e2eConfig.BasePort = int(atomic.AddInt32(&uniqueBasePort, int32(cfg.ClusterSize+2)*5))
 	epc, err := NewEtcdProcessCluster(ctx, t, WithConfig(e2eConfig))
 	if err != nil {
 		t.Fatalf("could not start etcd integrationCluster: %s", err)