diff --git a/pkg/cluster/manager/scale_out.go b/pkg/cluster/manager/scale_out.go
index 8a7b5ed467..43c6a0ae45 100644
--- a/pkg/cluster/manager/scale_out.go
+++ b/pkg/cluster/manager/scale_out.go
@@ -175,12 +175,6 @@ func (m *Manager) ScaleOut(
 					}
 				}
 			}
-
-			// newPart needs ComponentVersions but the original ComponentVersions is not passed to newPart.
-			// Copy the merged ComponentVersions to newPart.
-			if newSpec, ok := newPart.(*spec.Specification); ok {
-				newSpec.ComponentVersions = topo.ComponentVersions
-			}
 		}
 
 		if err := checkConflict(m, name, mergedTopo); err != nil {
diff --git a/pkg/cluster/spec/parse_topology_test.go b/pkg/cluster/spec/parse_topology_test.go
index 51d0adfb74..4b544da329 100644
--- a/pkg/cluster/spec/parse_topology_test.go
+++ b/pkg/cluster/spec/parse_topology_test.go
@@ -540,6 +540,37 @@ tiflash_servers:
 	})
 }
 
+func (s *topoSuite) TestMergeComponentVersions(c *check.C) {
+	// test component version overwrite
+	with2TempFile(`
+component_versions:
+  tidb: v8.0.0
+  tikv: v8.0.0
+tidb_servers:
+  - host: 172.16.5.139
+`, `
+component_versions:
+  tikv: v8.1.0
+  pd: v8.0.0
+tidb_servers:
+  - host: 172.16.5.134
+`, func(base, scale string) {
+		baseTopo := Specification{}
+		c.Assert(ParseTopologyYaml(base, &baseTopo), check.IsNil)
+
+		scaleTopo := baseTopo.NewPart()
+		c.Assert(ParseTopologyYaml(scale, scaleTopo), check.IsNil)
+
+		mergedTopo := baseTopo.MergeTopo(scaleTopo)
+		c.Assert(mergedTopo.Validate(), check.IsNil)
+
+		c.Assert(scaleTopo.(*Specification).ComponentVersions, check.Equals, mergedTopo.(*Specification).ComponentVersions)
+		c.Assert(scaleTopo.(*Specification).ComponentVersions.TiDB, check.Equals, "v8.0.0")
+		c.Assert(scaleTopo.(*Specification).ComponentVersions.TiKV, check.Equals, "v8.1.0")
+		c.Assert(scaleTopo.(*Specification).ComponentVersions.PD, check.Equals, "v8.0.0")
+	})
+}
+
 func (s *topoSuite) TestFixRelativePath(c *check.C) {
 	// base test
 	topo := Specification{
diff --git a/pkg/cluster/spec/spec.go b/pkg/cluster/spec/spec.go
index 99bd0e87dd..f00ae02db3 100644
--- a/pkg/cluster/spec/spec.go
+++ b/pkg/cluster/spec/spec.go
@@ -270,9 +270,10 @@ type UpgradableMetadata interface {
 // NewPart implements ScaleOutTopology interface.
 func (s *Specification) NewPart() Topology {
 	return &Specification{
-		GlobalOptions:    s.GlobalOptions,
-		MonitoredOptions: s.MonitoredOptions,
-		ServerConfigs:    s.ServerConfigs,
+		GlobalOptions:     s.GlobalOptions,
+		MonitoredOptions:  s.MonitoredOptions,
+		ServerConfigs:     s.ServerConfigs,
+		ComponentVersions: s.ComponentVersions,
 	}
 }