diff --git a/scanner/redhatbase.go b/scanner/redhatbase.go
index 77e9e0c1..5e07b9a5 100644
--- a/scanner/redhatbase.go
+++ b/scanner/redhatbase.go
@@ -289,8 +289,9 @@ func (o *redhatBase) scanPackages() (err error) {
 	}
 
 	if o.getServerInfo().Mode.IsDeep() {
-		resolver := yumInstallDependentResolver{redhat: o}
-		resolver.scanDependentPkgsForUpdate()
+		resolver := yumDependentResolver{redhat: o}
+		resolver.detectDependenciesForUpdate()
+		resolver.detectReverseDependencies()
 	}
 
 	return nil
@@ -727,16 +728,18 @@ func (o *redhatBase) parseDnfModuleList(stdout string) (labels []string, err err
 	return
 }
 
-type yumInstallDependentResolver struct {
+type yumDependentResolver struct {
 	redhat *redhatBase
 }
 
-func (o *yumInstallDependentResolver) scanDependentPkgsForUpdate() {
-	o.redhat.log.Infof("Detecting the dependencies of each packages when yum updating")
+func (o *yumDependentResolver) detectDependenciesForUpdate() {
+	o.redhat.log.Infof("Detecting the dependencies for each packages when yum updating")
+	o.redhat.log.Infof("If it is too slow, `yum clean all` may make it faster")
 	bar := pb.StartNew(len(o.redhat.Packages))
 	for name, pkg := range o.redhat.Packages {
 		bar.Increment()
 		if pkg.Version == pkg.NewVersion && pkg.Release == pkg.NewRelease {
+			// only updatable pkgs
 			continue
 		}
 		names, err := o.scanUpdatablePkgDeps(name)
@@ -745,16 +748,14 @@ func (o *yumInstallDependentResolver) scanDependentPkgsForUpdate() {
 			o.redhat.warns = append(o.redhat.warns, err)
 			// Only warning this error
 		}
-		for _, n := range names {
-			pkg.DependenciesForUpdate = append(pkg.DependenciesForUpdate, n)
-		}
+		pkg.DependenciesForUpdate = names
 		o.redhat.Packages[name] = pkg
 	}
 	bar.Finish()
 	return
 }
 
-func (o *yumInstallDependentResolver) scanUpdatablePkgDeps(name string) (depsPkgNames []string, err error) {
+func (o *yumDependentResolver) scanUpdatablePkgDeps(name string) (depsPkgNames []string, err error) {
 	cmd := fmt.Sprintf("LANGUAGE=en_US.UTF-8 yum install --assumeno --cacheonly --quiet %s", name)
 	r := o.redhat.exec(cmd, true)
 	if !r.isSuccess(0, 1) {
@@ -769,7 +770,7 @@ func (o *yumInstallDependentResolver) scanUpdatablePkgDeps(name string) (depsPkg
 	return
 }
 
-func (o *yumInstallDependentResolver) parseYumInstall(stdout string) []string {
+func (o *yumDependentResolver) parseYumInstall(stdout string) []string {
 	names, inDepsLines := []string{}, false
 	scanner := bufio.NewScanner(strings.NewReader(stdout))
 	for scanner.Scan() {
@@ -788,3 +789,54 @@ func (o *yumInstallDependentResolver) parseYumInstall(stdout string) []string {
 	}
 	return names
 }
+
+func (o *yumDependentResolver) detectReverseDependencies() {
+	o.redhat.log.Infof("Detecting the reverse dependencies for each packages")
+	bar := pb.StartNew(len(o.redhat.Packages))
+	for name, pkg := range o.redhat.Packages {
+		bar.Increment()
+		if pkg.Version == pkg.NewVersion && pkg.Release == pkg.NewRelease {
+			continue
+		}
+		names, err := o.repoqueryWhatRequires(name)
+		if err != nil {
+			o.redhat.log.Warnf("err: %+v", xerrors.Errorf("Failed to scan reverse dependent packages: %w", err))
+			o.redhat.warns = append(o.redhat.warns, err)
+			// Only warning this error
+		}
+		pkg.ReverseDependencies = names
+		o.redhat.Packages[name] = pkg
+	}
+	bar.Finish()
+	return
+}
+
+func (o *yumDependentResolver) repoqueryWhatRequires(pkgName string) (depsPkgNames []string, err error) {
+	cmd := `LANGUAGE=en_US.UTF-8 repoquery --whatrequires --resolve --pkgnarrow=installed --qf "%{name}" ` + pkgName
+	r := o.redhat.exec(cmd, true)
+	if !r.isSuccess() {
+		return nil, xerrors.Errorf("Failed to SSH: %s", r)
+	}
+	names := o.parseRepoqueryWhatRequires(r.Stdout)
+	for _, n := range names {
+		if pkgName == n {
+			continue
+		}
+		if _, ok := o.redhat.Packages[n]; ok {
+			depsPkgNames = append(depsPkgNames, n)
+		}
+	}
+	return
+}
+
+func (o *yumDependentResolver) parseRepoqueryWhatRequires(stdout string) []string {
+	names := []string{}
+	scanner := bufio.NewScanner(strings.NewReader(stdout))
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line != "" {
+			names = append(names, line)
+		}
+	}
+	return names
+}
diff --git a/scanner/redhatbase_test.go b/scanner/redhatbase_test.go
index 84c6d86d..316661f7 100644
--- a/scanner/redhatbase_test.go
+++ b/scanner/redhatbase_test.go
@@ -10,11 +10,6 @@ import (
 	"github.com/k0kubun/pp"
 )
 
-//  func unixtimeNoerr(s string) time.Time {
-//      t, _ := unixtime(s)
-//      return t
-//  }
-
 func TestParseInstalledPackagesLinesRedhat(t *testing.T) {
 	r := newRHEL(config.ServerInfo{})
 	r.Distro = config.Distro{Family: constant.RedHat}
@@ -702,10 +697,64 @@ Your transaction was saved, rerun it with:
 			o := &redhatBase{
 				base: tt.fields.base,
 			}
-			resolver := yumInstallDependentResolver{redhat: o}
+			resolver := yumDependentResolver{redhat: o}
 			if gotPkgNames := resolver.parseYumInstall(tt.args.stdout); !reflect.DeepEqual(gotPkgNames, tt.wantPkgNames) {
 				t.Errorf("redhatBase.parseYumInstall() = %v, want %v", gotPkgNames, tt.wantPkgNames)
 			}
 		})
 	}
 }
+
+func Test_yumDependentResolver_parseRepoqueryWhatRequires(t *testing.T) {
+	type fields struct {
+		redhat *redhatBase
+	}
+	type args struct {
+		stdout string
+	}
+	tests := []struct {
+		name   string
+		fields fields
+		args   args
+		want   []string
+	}{
+		{
+			name:   "no deps",
+			fields: fields{redhat: &redhatBase{}},
+			args: args{
+				stdout: "",
+			},
+			want: []string{},
+		},
+		{
+			name:   "no deps",
+			fields: fields{redhat: &redhatBase{}},
+			args: args{
+				stdout: `which
+whois
+wpa_supplicant
+xcb-util
+xfsprogs
+xinetd`,
+			},
+			want: []string{
+				"which",
+				"whois",
+				"wpa_supplicant",
+				"xcb-util",
+				"xfsprogs",
+				"xinetd",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			o := &yumDependentResolver{
+				redhat: tt.fields.redhat,
+			}
+			if got := o.parseRepoqueryWhatRequires(tt.args.stdout); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("yumDependentResolver.parseRepoqueryWhatRequires() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}