diff --git a/models/actions/run.go b/models/actions/run.go
index 18ed447e8..4853afc15 100644
--- a/models/actions/run.go
+++ b/models/actions/run.go
@@ -6,6 +6,7 @@ package actions
 import (
 	"context"
 	"fmt"
+	"slices"
 	"strings"
 	"time"
 
@@ -350,7 +351,7 @@ func UpdateRun(ctx context.Context, run *ActionRun, cols ...string) error {
 		// It's impossible that the run is not found, since Gitea never deletes runs.
 	}
 
-	if run.Status != 0 || util.SliceContains(cols, "status") {
+	if run.Status != 0 || slices.Contains(cols, "status") {
 		if run.RepoID == 0 {
 			run, err = GetRunByID(ctx, run.ID)
 			if err != nil {
diff --git a/models/actions/run_job.go b/models/actions/run_job.go
index 1da58bb65..4b8664077 100644
--- a/models/actions/run_job.go
+++ b/models/actions/run_job.go
@@ -6,6 +6,7 @@ package actions
 import (
 	"context"
 	"fmt"
+	"slices"
 	"time"
 
 	"code.gitea.io/gitea/models/db"
@@ -107,11 +108,11 @@ func UpdateRunJob(ctx context.Context, job *ActionRunJob, cond builder.Cond, col
 		return 0, err
 	}
 
-	if affected == 0 || (!util.SliceContains(cols, "status") && job.Status == 0) {
+	if affected == 0 || (!slices.Contains(cols, "status") && job.Status == 0) {
 		return affected, nil
 	}
 
-	if affected != 0 && util.SliceContains(cols, "status") && job.Status.IsWaiting() {
+	if affected != 0 && slices.Contains(cols, "status") && job.Status.IsWaiting() {
 		// if the status of job changes to waiting again, increase tasks version.
 		if err := IncreaseTaskVersion(ctx, job.OwnerID, job.RepoID); err != nil {
 			return 0, err
diff --git a/models/git/protected_branch.go b/models/git/protected_branch.go
index eef7e3935..5ed100374 100644
--- a/models/git/protected_branch.go
+++ b/models/git/protected_branch.go
@@ -7,6 +7,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"slices"
 	"strings"
 
 	"code.gitea.io/gitea/models/db"
@@ -435,7 +436,7 @@ func updateTeamWhitelist(ctx context.Context, repo *repo_model.Repository, curre
 
 	whitelist = make([]int64, 0, len(teams))
 	for i := range teams {
-		if util.SliceContains(newWhitelist, teams[i].ID) {
+		if slices.Contains(newWhitelist, teams[i].ID) {
 			whitelist = append(whitelist, teams[i].ID)
 		}
 	}
diff --git a/models/issues/issue.go b/models/issues/issue.go
index f000f4c66..8f59c9cb4 100644
--- a/models/issues/issue.go
+++ b/models/issues/issue.go
@@ -8,6 +8,7 @@ import (
 	"context"
 	"fmt"
 	"regexp"
+	"slices"
 
 	"code.gitea.io/gitea/models/db"
 	project_model "code.gitea.io/gitea/models/project"
@@ -605,7 +606,7 @@ func IsUserParticipantsOfIssue(user *user_model.User, issue *Issue) bool {
 		log.Error(err.Error())
 		return false
 	}
-	return util.SliceContains(userIDs, user.ID)
+	return slices.Contains(userIDs, user.ID)
 }
 
 // DependencyInfo represents high level information about an issue which is a dependency of another issue.
@@ -630,7 +631,7 @@ func (issue *Issue) GetParticipantIDsByIssue(ctx context.Context) ([]int64, erro
 		Find(&userIDs); err != nil {
 		return nil, fmt.Errorf("get poster IDs: %w", err)
 	}
-	if !util.SliceContains(userIDs, issue.PosterID) {
+	if !slices.Contains(userIDs, issue.PosterID) {
 		return append(userIDs, issue.PosterID), nil
 	}
 	return userIDs, nil
diff --git a/models/repo/repo_unit.go b/models/repo/repo_unit.go
index cf9ff93d3..b8804c6df 100644
--- a/models/repo/repo_unit.go
+++ b/models/repo/repo_unit.go
@@ -6,6 +6,7 @@ package repo
 import (
 	"context"
 	"fmt"
+	"slices"
 	"strings"
 
 	"code.gitea.io/gitea/models/db"
@@ -176,7 +177,7 @@ func (cfg *ActionsConfig) ToString() string {
 }
 
 func (cfg *ActionsConfig) IsWorkflowDisabled(file string) bool {
-	return util.SliceContains(cfg.DisabledWorkflows, file)
+	return slices.Contains(cfg.DisabledWorkflows, file)
 }
 
 func (cfg *ActionsConfig) DisableWorkflow(file string) {
diff --git a/modules/indexer/code/indexer.go b/modules/indexer/code/indexer.go
index 13d06874c..80bde7614 100644
--- a/modules/indexer/code/indexer.go
+++ b/modules/indexer/code/indexer.go
@@ -7,6 +7,7 @@ import (
 	"context"
 	"os"
 	"runtime/pprof"
+	"slices"
 	"sync/atomic"
 	"time"
 
@@ -20,7 +21,6 @@ import (
 	"code.gitea.io/gitea/modules/process"
 	"code.gitea.io/gitea/modules/queue"
 	"code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/util"
 )
 
 var (
@@ -54,22 +54,22 @@ func index(ctx context.Context, indexer internal.Indexer, repoID int64) error {
 	}
 
 	// skip forks from being indexed if unit is not present
-	if !util.SliceContains(repoTypes, "forks") && repo.IsFork {
+	if !slices.Contains(repoTypes, "forks") && repo.IsFork {
 		return nil
 	}
 
 	// skip mirrors from being indexed if unit is not present
-	if !util.SliceContains(repoTypes, "mirrors") && repo.IsMirror {
+	if !slices.Contains(repoTypes, "mirrors") && repo.IsMirror {
 		return nil
 	}
 
 	// skip templates from being indexed if unit is not present
-	if !util.SliceContains(repoTypes, "templates") && repo.IsTemplate {
+	if !slices.Contains(repoTypes, "templates") && repo.IsTemplate {
 		return nil
 	}
 
 	// skip regular repos from being indexed if unit is not present
-	if !util.SliceContains(repoTypes, "sources") && !repo.IsFork && !repo.IsMirror && !repo.IsTemplate {
+	if !slices.Contains(repoTypes, "sources") && !repo.IsFork && !repo.IsMirror && !repo.IsTemplate {
 		return nil
 	}
 
diff --git a/modules/indexer/issues/internal/tests/tests.go b/modules/indexer/issues/internal/tests/tests.go
index 93d38a0b3..06fddeb65 100644
--- a/modules/indexer/issues/internal/tests/tests.go
+++ b/modules/indexer/issues/internal/tests/tests.go
@@ -10,6 +10,7 @@ package tests
 import (
 	"context"
 	"fmt"
+	"slices"
 	"testing"
 	"time"
 
@@ -457,7 +458,7 @@ var cases = []*testIndexerCase{
 				assert.Contains(t, data[v.ID].MentionIDs, int64(1))
 			}
 			assert.Equal(t, countIndexerData(data, func(v *internal.IndexerData) bool {
-				return util.SliceContains(v.MentionIDs, 1)
+				return slices.Contains(v.MentionIDs, 1)
 			}), result.Total)
 		},
 	},
@@ -478,7 +479,7 @@ var cases = []*testIndexerCase{
 				assert.Contains(t, data[v.ID].ReviewedIDs, int64(1))
 			}
 			assert.Equal(t, countIndexerData(data, func(v *internal.IndexerData) bool {
-				return util.SliceContains(v.ReviewedIDs, 1)
+				return slices.Contains(v.ReviewedIDs, 1)
 			}), result.Total)
 		},
 	},
@@ -499,7 +500,7 @@ var cases = []*testIndexerCase{
 				assert.Contains(t, data[v.ID].ReviewRequestedIDs, int64(1))
 			}
 			assert.Equal(t, countIndexerData(data, func(v *internal.IndexerData) bool {
-				return util.SliceContains(v.ReviewRequestedIDs, 1)
+				return slices.Contains(v.ReviewRequestedIDs, 1)
 			}), result.Total)
 		},
 	},
@@ -520,7 +521,7 @@ var cases = []*testIndexerCase{
 				assert.Contains(t, data[v.ID].SubscriberIDs, int64(1))
 			}
 			assert.Equal(t, countIndexerData(data, func(v *internal.IndexerData) bool {
-				return util.SliceContains(v.SubscriberIDs, 1)
+				return slices.Contains(v.SubscriberIDs, 1)
 			}), result.Total)
 		},
 	},
diff --git a/modules/templates/base.go b/modules/templates/base.go
index ef28cc03f..2c2f35bbe 100644
--- a/modules/templates/base.go
+++ b/modules/templates/base.go
@@ -4,11 +4,11 @@
 package templates
 
 import (
+	"slices"
 	"strings"
 
 	"code.gitea.io/gitea/modules/assetfs"
 	"code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/util"
 )
 
 func AssetFS() *assetfs.LayeredFS {
@@ -24,7 +24,7 @@ func ListWebTemplateAssetNames(assets *assetfs.LayeredFS) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	return util.SliceRemoveAllFunc(files, func(file string) bool {
+	return slices.DeleteFunc(files, func(file string) bool {
 		return strings.HasPrefix(file, "mail/") || !strings.HasSuffix(file, ".tmpl")
 	}), nil
 }
@@ -34,7 +34,7 @@ func ListMailTemplateAssetNames(assets *assetfs.LayeredFS) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	return util.SliceRemoveAllFunc(files, func(file string) bool {
+	return slices.DeleteFunc(files, func(file string) bool {
 		return !strings.HasPrefix(file, "mail/") || !strings.HasSuffix(file, ".tmpl")
 	}), nil
 }
diff --git a/modules/util/slice.go b/modules/util/slice.go
index 74356f549..6d63ab4a7 100644
--- a/modules/util/slice.go
+++ b/modules/util/slice.go
@@ -1,37 +1,21 @@
 // Copyright 2022 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-// Most of the functions in this file can have better implementations with "golang.org/x/exp/slices".
-// However, "golang.org/x/exp" is experimental and unreliable, we shouldn't use it.
-// So lets waiting for the "slices" has be promoted to the main repository one day.
-
 package util
 
-import "strings"
-
-// SliceContains returns true if the target exists in the slice.
-func SliceContains[T comparable](slice []T, target T) bool {
-	return SliceContainsFunc(slice, func(t T) bool { return t == target })
-}
-
-// SliceContainsFunc returns true if any element in the slice satisfies the targetFunc.
-func SliceContainsFunc[T any](slice []T, targetFunc func(T) bool) bool {
-	for _, v := range slice {
-		if targetFunc(v) {
-			return true
-		}
-	}
-	return false
-}
+import (
+	"slices"
+	"strings"
+)
 
 // SliceContainsString sequential searches if string exists in slice.
 func SliceContainsString(slice []string, target string, insensitive ...bool) bool {
 	if len(insensitive) != 0 && insensitive[0] {
 		target = strings.ToLower(target)
-		return SliceContainsFunc(slice, func(t string) bool { return strings.ToLower(t) == target })
+		return slices.ContainsFunc(slice, func(t string) bool { return strings.ToLower(t) == target })
 	}
 
-	return SliceContains(slice, target)
+	return slices.Contains(slice, target)
 }
 
 // SliceSortedEqual returns true if the two slices will be equal when they get sorted.
@@ -57,34 +41,7 @@ func SliceSortedEqual[T comparable](s1, s2 []T) bool {
 	return true
 }
 
-// SliceEqual returns true if the two slices are equal.
-func SliceEqual[T comparable](s1, s2 []T) bool {
-	if len(s1) != len(s2) {
-		return false
-	}
-
-	for i, v := range s1 {
-		if s2[i] != v {
-			return false
-		}
-	}
-	return true
-}
-
 // SliceRemoveAll removes all the target elements from the slice.
 func SliceRemoveAll[T comparable](slice []T, target T) []T {
-	return SliceRemoveAllFunc(slice, func(t T) bool { return t == target })
-}
-
-// SliceRemoveAllFunc removes all elements which satisfy the targetFunc from the slice.
-func SliceRemoveAllFunc[T comparable](slice []T, targetFunc func(T) bool) []T {
-	idx := 0
-	for _, v := range slice {
-		if targetFunc(v) {
-			continue
-		}
-		slice[idx] = v
-		idx++
-	}
-	return slice[:idx]
+	return slices.DeleteFunc(slice, func(t T) bool { return t == target })
 }
diff --git a/modules/util/slice_test.go b/modules/util/slice_test.go
index 373c1a3b7..a910f5edf 100644
--- a/modules/util/slice_test.go
+++ b/modules/util/slice_test.go
@@ -9,20 +9,6 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestSliceContains(t *testing.T) {
-	assert.True(t, SliceContains([]int{2, 0, 2, 3}, 2))
-	assert.True(t, SliceContains([]int{2, 0, 2, 3}, 0))
-	assert.True(t, SliceContains([]int{2, 0, 2, 3}, 3))
-
-	assert.True(t, SliceContains([]string{"2", "0", "2", "3"}, "0"))
-	assert.True(t, SliceContains([]float64{2, 0, 2, 3}, 0))
-	assert.True(t, SliceContains([]bool{false, true, false}, true))
-
-	assert.False(t, SliceContains([]int{2, 0, 2, 3}, 4))
-	assert.False(t, SliceContains([]int{}, 4))
-	assert.False(t, SliceContains(nil, 4))
-}
-
 func TestSliceContainsString(t *testing.T) {
 	assert.True(t, SliceContainsString([]string{"c", "b", "a", "b"}, "a"))
 	assert.True(t, SliceContainsString([]string{"c", "b", "a", "b"}, "b"))
@@ -54,25 +40,6 @@ func TestSliceSortedEqual(t *testing.T) {
 	assert.False(t, SliceSortedEqual([]int{2, 0, 0, 3}, []int{2, 0, 2, 3}))
 }
 
-func TestSliceEqual(t *testing.T) {
-	assert.True(t, SliceEqual([]int{2, 0, 2, 3}, []int{2, 0, 2, 3}))
-	assert.True(t, SliceEqual([]int{}, []int{}))
-	assert.True(t, SliceEqual([]int(nil), nil))
-	assert.True(t, SliceEqual([]int(nil), []int{}))
-	assert.True(t, SliceEqual([]int{}, []int{}))
-
-	assert.True(t, SliceEqual([]string{"2", "0", "2", "3"}, []string{"2", "0", "2", "3"}))
-	assert.True(t, SliceEqual([]float64{2, 0, 2, 3}, []float64{2, 0, 2, 3}))
-	assert.True(t, SliceEqual([]bool{false, true, false}, []bool{false, true, false}))
-
-	assert.False(t, SliceEqual([]int{3, 0, 2, 2}, []int{2, 0, 2, 3}))
-	assert.False(t, SliceEqual([]int{2, 0, 2}, []int{2, 0, 2, 3}))
-	assert.False(t, SliceEqual([]int{}, []int{2, 0, 2, 3}))
-	assert.False(t, SliceEqual(nil, []int{2, 0, 2, 3}))
-	assert.False(t, SliceEqual([]int{2, 0, 2, 4}, []int{2, 0, 2, 3}))
-	assert.False(t, SliceEqual([]int{2, 0, 0, 3}, []int{2, 0, 2, 3}))
-}
-
 func TestSliceRemoveAll(t *testing.T) {
 	assert.ElementsMatch(t, []int{2, 2, 3}, SliceRemoveAll([]int{2, 0, 2, 3}, 0))
 	assert.ElementsMatch(t, []int{0, 3}, SliceRemoveAll([]int{2, 0, 2, 3}, 2))
diff --git a/routers/api/packages/chef/auth.go b/routers/api/packages/chef/auth.go
index d89564089..53055bb68 100644
--- a/routers/api/packages/chef/auth.go
+++ b/routers/api/packages/chef/auth.go
@@ -16,6 +16,7 @@ import (
 	"net/http"
 	"path"
 	"regexp"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -265,7 +266,7 @@ func verifyDataOld(signature, data []byte, pub *rsa.PublicKey) error {
 		}
 	}
 
-	if !util.SliceEqual(out[skip:], data) {
+	if !slices.Equal(out[skip:], data) {
 		return fmt.Errorf("could not verify signature")
 	}
 
diff --git a/routers/api/v1/repo/repo.go b/routers/api/v1/repo/repo.go
index 29f6a675d..e86743d55 100644
--- a/routers/api/v1/repo/repo.go
+++ b/routers/api/v1/repo/repo.go
@@ -7,6 +7,7 @@ package repo
 import (
 	"fmt"
 	"net/http"
+	"slices"
 	"strings"
 	"time"
 
@@ -235,7 +236,7 @@ func CreateUserRepo(ctx *context.APIContext, owner *user_model.User, opt api.Cre
 	}
 
 	// If the readme template does not exist, a 400 will be returned.
-	if opt.AutoInit && len(opt.Readme) > 0 && !util.SliceContains(repo_module.Readmes, opt.Readme) {
+	if opt.AutoInit && len(opt.Readme) > 0 && !slices.Contains(repo_module.Readmes, opt.Readme) {
 		ctx.Error(http.StatusBadRequest, "", fmt.Errorf("readme template does not exist, available templates: %v", repo_module.Readmes))
 		return
 	}
diff --git a/routers/web/repo/issue.go b/routers/web/repo/issue.go
index f5e8f80dd..c95d54532 100644
--- a/routers/web/repo/issue.go
+++ b/routers/web/repo/issue.go
@@ -12,6 +12,7 @@ import (
 	"math/big"
 	"net/http"
 	"net/url"
+	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -3628,7 +3629,7 @@ func issuePosters(ctx *context.Context, isPullList bool) {
 	if search == "" && ctx.Doer != nil {
 		// the returned posters slice only contains limited number of users,
 		// to make the current user (doer) can quickly filter their own issues, always add doer to the posters slice
-		if !util.SliceContainsFunc(posters, func(user *user_model.User) bool { return user.ID == ctx.Doer.ID }) {
+		if !slices.ContainsFunc(posters, func(user *user_model.User) bool { return user.ID == ctx.Doer.ID }) {
 			posters = append(posters, ctx.Doer)
 		}
 	}
diff --git a/routers/web/repo/repo.go b/routers/web/repo/repo.go
index 12cd47792..3ed7ca1c9 100644
--- a/routers/web/repo/repo.go
+++ b/routers/web/repo/repo.go
@@ -8,6 +8,7 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
+	"slices"
 	"strings"
 
 	"code.gitea.io/gitea/models"
@@ -659,7 +660,7 @@ func GetBranchesList(ctx *context.Context) {
 	}
 	resp := &branchTagSearchResponse{}
 	// always put default branch on the top if it exists
-	if util.SliceContains(branches, ctx.Repo.Repository.DefaultBranch) {
+	if slices.Contains(branches, ctx.Repo.Repository.DefaultBranch) {
 		branches = util.SliceRemoveAll(branches, ctx.Repo.Repository.DefaultBranch)
 		branches = append([]string{ctx.Repo.Repository.DefaultBranch}, branches...)
 	}
@@ -693,7 +694,7 @@ func PrepareBranchList(ctx *context.Context) {
 		return
 	}
 	// always put default branch on the top if it exists
-	if util.SliceContains(brs, ctx.Repo.Repository.DefaultBranch) {
+	if slices.Contains(brs, ctx.Repo.Repository.DefaultBranch) {
 		brs = util.SliceRemoveAll(brs, ctx.Repo.Repository.DefaultBranch)
 		brs = append([]string{ctx.Repo.Repository.DefaultBranch}, brs...)
 	}
diff --git a/routers/web/repo/view.go b/routers/web/repo/view.go
index 15c85f642..f0fe6140d 100644
--- a/routers/web/repo/view.go
+++ b/routers/web/repo/view.go
@@ -14,6 +14,7 @@ import (
 	"net/http"
 	"net/url"
 	"path"
+	"slices"
 	"strings"
 	"time"
 
@@ -370,7 +371,7 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 		if workFlowErr != nil {
 			ctx.Data["FileError"] = ctx.Locale.Tr("actions.runs.invalid_workflow_helper", workFlowErr.Error())
 		}
-	} else if util.SliceContains([]string{"CODEOWNERS", "docs/CODEOWNERS", ".gitea/CODEOWNERS"}, ctx.Repo.TreePath) {
+	} else if slices.Contains([]string{"CODEOWNERS", "docs/CODEOWNERS", ".gitea/CODEOWNERS"}, ctx.Repo.TreePath) {
 		if data, err := blob.GetBlobContent(setting.UI.MaxDisplayFileSize); err == nil {
 			_, warnings := issue_model.GetCodeOwnersFromContent(ctx, data)
 			if len(warnings) > 0 {
diff --git a/routers/web/user/home.go b/routers/web/user/home.go
index a7f6a52f1..a88479e12 100644
--- a/routers/web/user/home.go
+++ b/routers/web/user/home.go
@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"net/http"
 	"regexp"
+	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -290,7 +291,7 @@ func Milestones(ctx *context.Context) {
 	if len(repoIDs) == 0 {
 		repoIDs = showRepoIds.Values()
 	}
-	repoIDs = util.SliceRemoveAllFunc(repoIDs, func(v int64) bool {
+	repoIDs = slices.DeleteFunc(repoIDs, func(v int64) bool {
 		return !showRepoIds.Contains(v)
 	})
 
@@ -534,7 +535,7 @@ func buildIssueOverview(ctx *context.Context, unitType unit.Type) {
 	// Gets set when clicking filters on the issues overview page.
 	selectedRepoIDs := getRepoIDs(ctx.FormString("repos"))
 	// Remove repo IDs that are not accessible to the user.
-	selectedRepoIDs = util.SliceRemoveAllFunc(selectedRepoIDs, func(v int64) bool {
+	selectedRepoIDs = slices.DeleteFunc(selectedRepoIDs, func(v int64) bool {
 		return !accessibleRepos.Contains(v)
 	})
 	if len(selectedRepoIDs) > 0 {