diff --git a/README.md b/README.md
index fccf2e8..64fc17e 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@
 - Support for listing installed versions of Go
 - Support for installing multiple versions of Go locally
 - Support for uninstalling installed versions of Go
+- Support for removing superseded versions, keeping the newest of each minor series
 - Support for freely switching between installed versions of Go
 - Support for clearing package file cache
 - Support for self-updating software (>= 1.5.0)
@@ -159,6 +160,17 @@ $ g uninstall 1.19.10
 Uninstalled go1.19.10
 ```
 
+To remove superseded installed versions, keeping only the newest version of each minor series (the version currently in use is never removed). Use `--dry-run` to preview without removing:
+
+```shell
+$ g prune --dry-run
+Would remove 1.19.10
+Would remove 1.20.4
+$ g prune
+Removed 1.19.10
+Removed 1.20.4
+```
+
 To clear the package file cache for Go installations:
 
 ```shell
diff --git a/README_CN.md b/README_CN.md
index 999e14d..3304438 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -20,6 +20,7 @@
 - 支持列出已安装的 go 版本号
 - 支持在本地安装多个 go 版本
 - 支持卸载已安装的 go 版本
+- 支持清理已被取代的 go 版本（每个次要版本系列保留最新版）
 - 支持在已安装的 go 版本之间自由切换
 - 支持清空安装包文件缓存
 - 支持软件自我更新（>= 1.5.0）
@@ -159,6 +160,17 @@ $ g uninstall 1.19.10
 Uninstalled go1.19.10
 ```
 
+清理已被取代的 go 版本，即每个次要版本系列只保留最新版（当前使用中的版本不会被删除）。可使用`--dry-run`参数预览而不实际删除：
+
+```shell
+$ g prune --dry-run
+Would remove 1.19.10
+Would remove 1.20.4
+$ g prune
+Removed 1.19.10
+Removed 1.20.4
+```
+
 清空 go 安装包文件缓存
 
 ```shell
diff --git a/cli/commands.go b/cli/commands.go
index 5cc7390..019e6ba 100644
--- a/cli/commands.go
+++ b/cli/commands.go
@@ -91,6 +91,18 @@ var (
 			UsageText: "g uninstall <version>",
 			Action:    uninstall,
 		},
+		{
+			Name:      "prune",
+			Usage:     "Remove superseded versions, keeping the newest of each minor series in use",
+			UsageText: "g prune",
+			Flags: []cli.Flag{
+				&cli.BoolFlag{
+					Name:  "dry-run",
+					Usage: "Show what would be removed without removing",
+				},
+			},
+			Action: prune,
+		},
 		{
 			Name:      "update",
 			Usage:     "Download and install updates to g",
diff --git a/cli/prune.go b/cli/prune.go
new file mode 100644
index 0000000..1d8852d
--- /dev/null
+++ b/cli/prune.go
@@ -0,0 +1,81 @@
+// Copyright (c) 2019 voidint <voidint@126.com>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+package cli
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/urfave/cli/v2"
+	"github.com/voidint/g/version"
+)
+
+func prune(ctx *cli.Context) error {
+	items, err := listLocalVersions(versionsDir)
+	if err != nil {
+		return cli.Exit(errstring(err), 1)
+	}
+	if len(items) == 0 {
+		fmt.Println("No version installed yet")
+		return nil
+	}
+
+	doomed := superseded(items, inuse(goroot))
+	if len(doomed) == 0 {
+		fmt.Println("Nothing to remove")
+		return nil
+	}
+
+	dryRun := ctx.Bool("dry-run")
+	for _, v := range doomed {
+		if dryRun {
+			fmt.Printf("Would remove %s\n", v.Name())
+			continue
+		}
+		if err := os.RemoveAll(filepath.Join(versionsDir, v.Name())); err != nil {
+			return cli.Exit(wrapstring(fmt.Sprintf("Failed to remove %q: %s", v.Name(), err.Error())), 1)
+		}
+		fmt.Printf("Removed %s\n", v.Name())
+	}
+	return nil
+}
+
+// superseded returns the versions that have a newer version in the same minor
+// series, excluding the version currently in use. It assumes items are sorted
+// in ascending order (see listLocalVersions).
+func superseded(items []*version.Version, inuse string) (doomed []*version.Version) {
+	for i, v := range items {
+		if v.Name() == inuse {
+			continue // never remove the version in use
+		}
+		// Same-series versions are adjacent in ascending order, so a version
+		// is superseded when its successor belongs to the same minor series.
+		if i+1 < len(items) && sameMinorSeries(v, items[i+1]) {
+			doomed = append(doomed, v)
+		}
+	}
+	return doomed
+}
+
+// sameMinorSeries reports whether two versions belong to the same major.minor series.
+func sameMinorSeries(a, b *version.Version) bool {
+	return a.Major() == b.Major() && a.Minor() == b.Minor()
+}
diff --git a/cli/prune_test.go b/cli/prune_test.go
new file mode 100644
index 0000000..8d2c8da
--- /dev/null
+++ b/cli/prune_test.go
@@ -0,0 +1,107 @@
+// Copyright (c) 2019 voidint <voidint@126.com>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+package cli
+
+import (
+	"sort"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/voidint/g/version"
+)
+
+func TestSuperseded(t *testing.T) {
+	tests := []struct {
+		name    string
+		install []string
+		inuse   string
+		want    []string
+	}{
+		{
+			name:    "no version installed",
+			install: nil,
+			inuse:   "",
+			want:    nil,
+		},
+		{
+			name:    "single version",
+			install: []string{"1.24.6"},
+			inuse:   "1.24.6",
+			want:    nil,
+		},
+		{
+			name:    "one version per minor series",
+			install: []string{"1.22.12", "1.23.8", "1.24.6"},
+			inuse:   "1.24.6",
+			want:    nil,
+		},
+		{
+			name:    "keeps the newest of each minor series",
+			install: []string{"1.19.10", "1.19.13", "1.20.4", "1.20.5", "1.24.5", "1.24.6"},
+			inuse:   "1.24.6",
+			want:    []string{"1.19.10", "1.20.4", "1.24.5"},
+		},
+		{
+			name:    "keeps the version in use even when superseded",
+			install: []string{"1.24.3", "1.24.5", "1.24.6"},
+			inuse:   "1.24.3",
+			want:    []string{"1.24.5"},
+		},
+		{
+			name:    "prerelease is superseded by the final release",
+			install: []string{"1.25rc1", "1.25.0"},
+			inuse:   "1.25.0",
+			want:    []string{"1.25rc1"},
+		},
+		{
+			name:    "keeps the newest prerelease within an unreleased series",
+			install: []string{"1.26beta1", "1.26rc1"},
+			inuse:   "1.26rc1",
+			want:    []string{"1.26beta1"},
+		},
+		{
+			name:    "different major versions are independent series",
+			install: []string{"1.24.1", "2.0.0", "2.0.1"},
+			inuse:   "1.24.1",
+			want:    []string{"2.0.0"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			items := make([]*version.Version, 0, len(tt.install))
+			for _, vname := range tt.install {
+				items = append(items, version.MustNew(vname))
+			}
+			sort.Sort(version.Collection(items))
+
+			doomed := superseded(items, tt.inuse)
+			got := make([]string, 0, len(doomed))
+			for _, v := range doomed {
+				got = append(got, v.Name())
+			}
+			if tt.want == nil {
+				assert.Empty(t, got)
+				return
+			}
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
diff --git a/version/version.go b/version/version.go
index 4b2fd73..fe16318 100644
--- a/version/version.go
+++ b/version/version.go
@@ -102,6 +102,16 @@ func (v *Version) Name() string {
 	return v.name
 }
 
+// Major returns the major number of the semantic version.
+func (v *Version) Major() uint64 {
+	return v.sv.Major()
+}
+
+// Minor returns the minor number of the semantic version.
+func (v *Version) Minor() uint64 {
+	return v.sv.Minor()
+}
+
 // Packages returns all distribution packages for different OS/ARCH combinations.
 func (v *Version) Packages() []Package {
 	items := make([]Package, 0, len(v.pkgs))