diff --git a/cmd/add.go b/cmd/add.go
index 871727ba..3b2851e8 100644
--- a/cmd/add.go
+++ b/cmd/add.go
@@ -2,8 +2,10 @@ package cmd
 
 import (
 	_ "embed"
+	"sort"
 
 	"github.com/spf13/cobra"
+	"golang.org/x/exp/maps"
 
 	"github.com/evilmartians/lefthook/internal/config"
 	"github.com/evilmartians/lefthook/internal/lefthook"
@@ -22,7 +24,8 @@ func (add) New(opts *lefthook.Options) *cobra.Command {
 		if len(args) != 0 {
 			return
 		}
-		ret = config.AvailableHooks[:]
+		ret = maps.Keys(config.AvailableHooks)
+		sort.Strings(ret)
 		return
 	}
 
diff --git a/cmd/run.go b/cmd/run.go
index c7b48615..0fa18e2d 100644
--- a/cmd/run.go
+++ b/cmd/run.go
@@ -1,7 +1,10 @@
 package cmd
 
 import (
+	"sort"
+
 	"github.com/spf13/cobra"
+	"golang.org/x/exp/maps"
 
 	"github.com/evilmartians/lefthook/internal/config"
 	"github.com/evilmartians/lefthook/internal/lefthook"
@@ -19,7 +22,9 @@ func (run) New(opts *lefthook.Options) *cobra.Command {
 			return
 		}
 		ret = lefthook.ConfigHookCompletions(opts)
-		ret = append(ret, config.AvailableHooks[:]...)
+		other := maps.Keys(config.AvailableHooks)
+		sort.Strings(other)
+		ret = append(ret, other...)
 		return
 	}
 
diff --git a/internal/config/available_hooks.go b/internal/config/available_hooks.go
index 551d4d05..17e208f5 100644
--- a/internal/config/available_hooks.go
+++ b/internal/config/available_hooks.go
@@ -7,36 +7,36 @@ const ChecksumFileName = "lefthook.checksum"
 const GhostHookName = "prepare-commit-msg"
 
 // AvailableHooks - list of hooks taken from https://git-scm.com/docs/githooks.
-var AvailableHooks = [...]string{
-	"pre-commit",
-	"pre-push",
-	"commit-msg",
-	"applypatch-msg",
-	"fsmonitor-watchman",
-	"p4-changelist",
-	"p4-post-changelist",
-	"p4-pre-submit",
-	"p4-prepare-changelist",
-	"post-applypatch",
-	"post-checkout",
-	"post-commit",
-	"post-index-change",
-	"post-merge",
-	"post-receive",
-	"post-rewrite",
-	"post-update",
-	"pre-applypatch",
-	"pre-auto-gc",
-	"pre-merge-commit",
-	"pre-rebase",
-	"pre-receive",
-	"prepare-commit-msg",
-	"proc-receive",
-	"push-to-checkout",
-	"rebase",
-	"reference-transaction",
-	"sendemail-validate",
-	"update",
+var AvailableHooks = map[string]struct{}{
+	"pre-commit":            {},
+	"pre-push":              {},
+	"commit-msg":            {},
+	"applypatch-msg":        {},
+	"fsmonitor-watchman":    {},
+	"p4-changelist":         {},
+	"p4-post-changelist":    {},
+	"p4-pre-submit":         {},
+	"p4-prepare-changelist": {},
+	"post-applypatch":       {},
+	"post-checkout":         {},
+	"post-commit":           {},
+	"post-index-change":     {},
+	"post-merge":            {},
+	"post-receive":          {},
+	"post-rewrite":          {},
+	"post-update":           {},
+	"pre-applypatch":        {},
+	"pre-auto-gc":           {},
+	"pre-merge-commit":      {},
+	"pre-rebase":            {},
+	"pre-receive":           {},
+	"prepare-commit-msg":    {},
+	"proc-receive":          {},
+	"push-to-checkout":      {},
+	"rebase":                {},
+	"reference-transaction": {},
+	"sendemail-validate":    {},
+	"update":                {},
 }
 
 func HookUsesStagedFiles(hook string) bool {
@@ -47,12 +47,7 @@ func HookUsesPushFiles(hook string) bool {
 	return hook == "pre-push"
 }
 
-func HookAvailable(hook string) bool {
-	for _, name := range AvailableHooks {
-		if name == hook {
-			return true
-		}
-	}
-
-	return false
+func KnownHook(hook string) bool {
+	_, ok := AvailableHooks[hook]
+	return ok
 }
diff --git a/internal/config/load.go b/internal/config/load.go
index 92c4aa26..e8f0fb98 100644
--- a/internal/config/load.go
+++ b/internal/config/load.go
@@ -280,7 +280,7 @@ func mergeLocal(v *viper.Viper) error {
 func unmarshalConfigs(base, extra *viper.Viper, c *Config) error {
 	c.Hooks = make(map[string]*Hook)
 
-	for _, hookName := range AvailableHooks {
+	for hookName := range AvailableHooks {
 		if err := addHook(hookName, base, extra, c); err != nil {
 			return err
 		}
diff --git a/internal/lefthook/add.go b/internal/lefthook/add.go
index 0fcc9cf2..be65023d 100644
--- a/internal/lefthook/add.go
+++ b/internal/lefthook/add.go
@@ -27,7 +27,7 @@ func Add(opts *Options, args *AddArgs) error {
 
 // Creates a hook, given in args. The hook is a Lefthook hook.
 func (l *Lefthook) Add(args *AddArgs) error {
-	if !config.HookAvailable(args.Hook) {
+	if !config.KnownHook(args.Hook) {
 		return fmt.Errorf("Skip adding, hook is unavailable: %s", args.Hook)
 	}
 
diff --git a/internal/lefthook/run.go b/internal/lefthook/run.go
index 0c38c5c7..08560552 100644
--- a/internal/lefthook/run.go
+++ b/internal/lefthook/run.go
@@ -8,7 +8,6 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
-	"slices"
 	"time"
 
 	"github.com/evilmartians/lefthook/internal/config"
@@ -108,7 +107,7 @@ func (l *Lefthook) Run(hookName string, args RunArgs, gitArgs []string) error {
 	// Find the hook
 	hook, ok := cfg.Hooks[hookName]
 	if !ok {
-		if slices.Contains(config.AvailableHooks[:], hookName) {
+		if config.KnownHook(hookName) {
 			log.Debugf("[lefthook] skip: Hook %s doesn't exist in the config", hookName)
 			return nil
 		}