diff --git a/.github/workflows/build_test.yml b/.github/workflows/build_test.yml
index ce255f926..e636b763a 100644
--- a/.github/workflows/build_test.yml
+++ b/.github/workflows/build_test.yml
@@ -26,13 +26,13 @@ jobs:
       with:
         go-version: ${{ matrix.go-version }}
     - name: Checkout code
-      uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
     - id: cache-paths
       run: |
         echo "::set-output name=cache::$(go env GOCACHE)"
         echo "::set-output name=mod-cache::$(go env GOMODCACHE)"
     - name: Cache go modules
-      uses: actions/cache@88522ab9f39a2ea568f7027eddc7d8d8bc9d59c8 # v3.3.1
+      uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
       with:
         path: |
           ${{ steps.cache-paths.outputs.cache }}
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 5a9ebcadf..245f7e983 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -19,8 +19,9 @@ jobs:
         uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
         with:
           go-version: 1.17
+          cache: false
       - name: Checkout repository
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
       - name: Setup golangci-lint
         uses: golangci/golangci-lint-action@3a919529898de77ec3da873e3063ca4b10e7f5cc # v3.7.0
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index efd3baea3..6bdd103ac 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,6 +10,6 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
       - name: Release
         run: make release
diff --git a/.github/workflows/sbom_generator.yml b/.github/workflows/sbom_generator.yml
index 97565c191..771a7e1b4 100644
--- a/.github/workflows/sbom_generator.yml
+++ b/.github/workflows/sbom_generator.yml
@@ -13,13 +13,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
 
       - uses: advanced-security/sbom-generator-action@375dee8e6144d9fd0ec1f5667b4f6fb4faacefed # v0.0.1
         id: sbom
         env: 
           GITHUB_TOKEN: ${{ github.token }}
-      - uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
+      - uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
         with: 
           path: ${{steps.sbom.outputs.fileName }}
           name: "SBOM"
diff --git a/.github/workflows/shellcheck.yml b/.github/workflows/shellcheck.yml
index b700ca8bd..2c2198f12 100644
--- a/.github/workflows/shellcheck.yml
+++ b/.github/workflows/shellcheck.yml
@@ -8,6 +8,6 @@ jobs:
     name: Shellcheck
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+    - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
     - name: Run ShellCheck
       uses: ludeeus/action-shellcheck@00cae500b08a931fb5698e11e79bfbd38e612a38 # v2.0.0
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index dacda8bff..5f1f3a7c9 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -27,13 +27,13 @@ jobs:
       with:
         go-version: ${{ matrix.go-version }}
     - name: Checkout code
-      uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
     - id: go-env
       run: |
         echo "::set-output name=cache::$(go env GOCACHE)"
         echo "::set-output name=mod-cache::$(go env GOMODCACHE)"
     - name: Cache go modules
-      uses: actions/cache@88522ab9f39a2ea568f7027eddc7d8d8bc9d59c8 # v3.3.1
+      uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
       with:
         path: |
           ${{ steps.go-env.outputs.cache }}
diff --git a/.golangci.yml b/.golangci.yml
index 4d163db1a..170626bfd 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -1,21 +1,21 @@
 issues:
   max-same-issues: 0
-  exclude-rules: 
-  - linters: 
-    - gosec
-    text: "G204"
-  - linters: 
-    - revive
-    text: "var-naming"
-  - linters: 
-    - revive
-    text: "exported"
-  - linters: 
-    - revive
-    text: "empty-block"
-  - linters: 
-    - revive
-    text: "unused-parameter"
+  exclude-rules:
+    - linters:
+        - gosec
+      text: "G204"
+    - linters:
+        - revive
+      text: "var-naming"
+    - linters:
+        - revive
+      text: "exported"
+    - linters:
+        - revive
+      text: "empty-block"
+    - linters:
+        - revive
+      text: "unused-parameter"
 linters:
   enable:
     - asciicheck
@@ -26,6 +26,7 @@ linters:
     - gofmt
     - gofumpt
     - goimports
+    - gomodguard
     - gosec
     - gosimple
     - importas
@@ -46,10 +47,16 @@ linters:
     - structcheck
     - unused
     - varcheck
-
 linters-settings:
   gci:
     sections:
-    - standard
-    - default
-    - prefix(github.com/shirou)
+      - standard
+      - default
+      - prefix(github.com/shirou)
+  gomodguard:
+    blocked:
+      modules:
+        - io/ioutil:
+            recommandations:
+              - io
+              - os
diff --git a/cpu/cpu_solaris_test.go b/cpu/cpu_solaris_test.go
index 508aad5e6..dd9362c3a 100644
--- a/cpu/cpu_solaris_test.go
+++ b/cpu/cpu_solaris_test.go
@@ -1,7 +1,7 @@
 package cpu
 
 import (
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"reflect"
 	"sort"
@@ -49,7 +49,7 @@ func TestParseISAInfo(t *testing.T) {
 	}
 
 	for _, tc := range cases {
-		content, err := ioutil.ReadFile(filepath.Join("testdata", "solaris", tc.filename))
+		content, err := os.ReadFile(filepath.Join("testdata", "solaris", tc.filename))
 		if err != nil {
 			t.Errorf("cannot read test case: %s", err)
 		}
@@ -138,7 +138,7 @@ func TestParseProcessorInfo(t *testing.T) {
 	}
 
 	for _, tc := range cases {
-		content, err := ioutil.ReadFile(filepath.Join("testdata", "solaris", tc.filename))
+		content, err := os.ReadFile(filepath.Join("testdata", "solaris", tc.filename))
 		if err != nil {
 			t.Errorf("cannot read test case: %s", err)
 		}
diff --git a/cpu/cpu_test.go b/cpu/cpu_test.go
index 4202ce841..688660a1a 100644
--- a/cpu/cpu_test.go
+++ b/cpu/cpu_test.go
@@ -138,8 +138,8 @@ func testCPUPercent(t *testing.T, percpu bool) {
 		if err != nil {
 			t.Errorf("error %v", err)
 		}
-		// Skip CircleCI which CPU num is different
-		if os.Getenv("CIRCLECI") != "true" {
+		// Skip CI which CPU num is different
+		if os.Getenv("CI") != "true" {
 			if (percpu && len(v) != numcpu) || (!percpu && len(v) != 1) {
 				t.Fatalf("wrong number of entries from CPUPercent: %v", v)
 			}
@@ -172,8 +172,8 @@ func testCPUPercentLastUsed(t *testing.T, percpu bool) {
 		if err != nil {
 			t.Errorf("error %v", err)
 		}
-		// Skip CircleCI which CPU num is different
-		if os.Getenv("CIRCLECI") != "true" {
+		// Skip CI which CPU num is different
+		if os.Getenv("CI") != "true" {
 			if (percpu && len(v) != numcpu) || (!percpu && len(v) != 1) {
 				t.Fatalf("wrong number of entries from CPUPercent: %v", v)
 			}
diff --git a/disk/disk_linux.go b/disk/disk_linux.go
index 5015c34ae..c06516c6c 100644
--- a/disk/disk_linux.go
+++ b/disk/disk_linux.go
@@ -9,7 +9,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -497,7 +496,7 @@ func SerialNumberWithContext(ctx context.Context, name string) (string, error) {
 
 	// Try to get the serial from udev data
 	udevDataPath := common.HostRunWithContext(ctx, fmt.Sprintf("udev/data/b%d:%d", major, minor))
-	if udevdata, err := ioutil.ReadFile(udevDataPath); err == nil {
+	if udevdata, err := os.ReadFile(udevDataPath); err == nil {
 		scanner := bufio.NewScanner(bytes.NewReader(udevdata))
 		for scanner.Scan() {
 			values := strings.Split(scanner.Text(), "=")
@@ -510,8 +509,8 @@ func SerialNumberWithContext(ctx context.Context, name string) (string, error) {
 	// Try to get the serial from sysfs, look at the disk device (minor 0) directly
 	// because if it is a partition it is not going to contain any device information
 	devicePath := common.HostSysWithContext(ctx, fmt.Sprintf("dev/block/%d:0/device", major))
-	model, _ := ioutil.ReadFile(filepath.Join(devicePath, "model"))
-	serial, _ := ioutil.ReadFile(filepath.Join(devicePath, "serial"))
+	model, _ := os.ReadFile(filepath.Join(devicePath, "model"))
+	serial, _ := os.ReadFile(filepath.Join(devicePath, "serial"))
 	if len(model) > 0 && len(serial) > 0 {
 		return fmt.Sprintf("%s_%s", string(model), string(serial)), nil
 	}
@@ -526,7 +525,7 @@ func LabelWithContext(ctx context.Context, name string) (string, error) {
 		return "", nil
 	}
 
-	dmname, err := ioutil.ReadFile(dmname_filename)
+	dmname, err := os.ReadFile(dmname_filename)
 	if err != nil {
 		return "", err
 	}
diff --git a/go.mod b/go.mod
index 8fc781e97..78cc4af5f 100644
--- a/go.mod
+++ b/go.mod
@@ -10,7 +10,7 @@ require (
 	github.com/stretchr/testify v1.8.4
 	github.com/tklauser/go-sysconf v0.3.12
 	github.com/yusufpapurcu/wmi v1.2.3
-	golang.org/x/sys v0.11.0
+	golang.org/x/sys v0.12.0
 )
 
 retract v3.22.11
diff --git a/go.sum b/go.sum
index 914427d7b..e558c9ce6 100644
--- a/go.sum
+++ b/go.sum
@@ -32,8 +32,9 @@ github.com/yusufpapurcu/wmi v1.2.3/go.mod h1:SBZ9tNy3G9/m5Oi98Zks0QjeHVDvuK0qfxQ
 golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201204225414-ed752295db88/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
 golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
+golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/host/host_darwin.go b/host/host_darwin.go
index 1be2e8533..f045d4f17 100644
--- a/host/host_darwin.go
+++ b/host/host_darwin.go
@@ -8,7 +8,7 @@ import (
 	"context"
 	"encoding/binary"
 	"errors"
-	"io/ioutil"
+	"io"
 	"os"
 	"strings"
 	"unsafe"
@@ -59,7 +59,7 @@ func UsersWithContext(ctx context.Context) ([]UserStat, error) {
 	}
 	defer file.Close()
 
-	buf, err := ioutil.ReadAll(file)
+	buf, err := io.ReadAll(file)
 	if err != nil {
 		return ret, err
 	}
diff --git a/host/host_freebsd.go b/host/host_freebsd.go
index 2c9aa9d0d..9a5382d39 100644
--- a/host/host_freebsd.go
+++ b/host/host_freebsd.go
@@ -7,7 +7,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/binary"
-	"io/ioutil"
+	"io"
 	"math"
 	"os"
 	"strings"
@@ -54,7 +54,7 @@ func UsersWithContext(ctx context.Context) ([]UserStat, error) {
 	}
 	defer file.Close()
 
-	buf, err := ioutil.ReadAll(file)
+	buf, err := io.ReadAll(file)
 	if err != nil {
 		return ret, err
 	}
@@ -111,7 +111,7 @@ func getUsersFromUtmp(utmpfile string) ([]UserStat, error) {
 	}
 	defer file.Close()
 
-	buf, err := ioutil.ReadAll(file)
+	buf, err := io.ReadAll(file)
 	if err != nil {
 		return ret, err
 	}
diff --git a/host/host_linux.go b/host/host_linux.go
index e6ac63a39..f9d7995e7 100644
--- a/host/host_linux.go
+++ b/host/host_linux.go
@@ -8,7 +8,7 @@ import (
 	"context"
 	"encoding/binary"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -91,7 +91,7 @@ func UsersWithContext(ctx context.Context) ([]UserStat, error) {
 	}
 	defer file.Close()
 
-	buf, err := ioutil.ReadAll(file)
+	buf, err := io.ReadAll(file)
 	if err != nil {
 		return nil, err
 	}
@@ -411,13 +411,13 @@ func SensorsTemperaturesWithContext(ctx context.Context) ([]TemperatureStat, err
 		}
 		for _, file := range files {
 			// Get the name of the temperature you are reading
-			name, err := ioutil.ReadFile(filepath.Join(file, "type"))
+			name, err := os.ReadFile(filepath.Join(file, "type"))
 			if err != nil {
 				warns.Add(err)
 				continue
 			}
 			// Get the temperature reading
-			current, err := ioutil.ReadFile(filepath.Join(file, "temp"))
+			current, err := os.ReadFile(filepath.Join(file, "temp"))
 			if err != nil {
 				warns.Add(err)
 				continue
@@ -461,13 +461,13 @@ func SensorsTemperaturesWithContext(ctx context.Context) ([]TemperatureStat, err
 		// Get the label of the temperature you are reading
 		label := ""
 
-		if raw, _ = ioutil.ReadFile(basepath + "_label"); len(raw) != 0 {
+		if raw, _ = os.ReadFile(basepath + "_label"); len(raw) != 0 {
 			// Format the label from "Core 0" to "core_0"
 			label = strings.Join(strings.Split(strings.TrimSpace(strings.ToLower(string(raw))), " "), "_")
 		}
 
 		// Get the name of the temperature you are reading
-		if raw, err = ioutil.ReadFile(filepath.Join(directory, "name")); err != nil {
+		if raw, err = os.ReadFile(filepath.Join(directory, "name")); err != nil {
 			warns.Add(err)
 			continue
 		}
@@ -479,7 +479,7 @@ func SensorsTemperaturesWithContext(ctx context.Context) ([]TemperatureStat, err
 		}
 
 		// Get the temperature reading
-		if raw, err = ioutil.ReadFile(file); err != nil {
+		if raw, err = os.ReadFile(file); err != nil {
 			warns.Add(err)
 			continue
 		}
@@ -513,7 +513,7 @@ func optionalValueReadFromFile(filename string) float64 {
 		return 0
 	}
 
-	if raw, err = ioutil.ReadFile(filename); err != nil {
+	if raw, err = os.ReadFile(filename); err != nil {
 		return 0
 	}
 
diff --git a/host/host_openbsd.go b/host/host_openbsd.go
index 569de4abd..325015c23 100644
--- a/host/host_openbsd.go
+++ b/host/host_openbsd.go
@@ -7,7 +7,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/binary"
-	"io/ioutil"
+	"io"
 	"os"
 	"strings"
 	"unsafe"
@@ -65,7 +65,7 @@ func UsersWithContext(ctx context.Context) ([]UserStat, error) {
 	}
 	defer file.Close()
 
-	buf, err := ioutil.ReadAll(file)
+	buf, err := io.ReadAll(file)
 	if err != nil {
 		return ret, err
 	}
diff --git a/host/host_solaris.go b/host/host_solaris.go
index 7d3625acb..fef67f835 100644
--- a/host/host_solaris.go
+++ b/host/host_solaris.go
@@ -7,7 +7,6 @@ import (
 	"encoding/csv"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"regexp"
 	"strconv"
@@ -60,7 +59,7 @@ func HostIDWithContext(ctx context.Context) (string, error) {
 
 // Count number of processes based on the number of entries in /proc
 func numProcs(ctx context.Context) (uint64, error) {
-	dirs, err := ioutil.ReadDir("/proc")
+	dirs, err := os.ReadDir("/proc")
 	if err != nil {
 		return 0, err
 	}
@@ -138,7 +137,7 @@ func VirtualizationWithContext(ctx context.Context) (string, string, error) {
 
 // Find distribution name from /etc/release
 func parseReleaseFile() (string, error) {
-	b, err := ioutil.ReadFile("/etc/release")
+	b, err := os.ReadFile("/etc/release")
 	if err != nil {
 		return "", err
 	}
diff --git a/host/host_test.go b/host/host_test.go
index 29cb9d2db..17ced6dac 100644
--- a/host/host_test.go
+++ b/host/host_test.go
@@ -33,7 +33,7 @@ func TestHostInfo(t *testing.T) {
 }
 
 func TestUptime(t *testing.T) {
-	if os.Getenv("CIRCLECI") == "true" {
+	if os.Getenv("CI") == "true" {
 		t.Skip("Skip CI")
 	}
 
@@ -48,7 +48,7 @@ func TestUptime(t *testing.T) {
 }
 
 func TestBoot_time(t *testing.T) {
-	if os.Getenv("CIRCLECI") == "true" {
+	if os.Getenv("CI") == "true" {
 		t.Skip("Skip CI")
 	}
 	v, err := BootTime()
diff --git a/internal/common/common.go b/internal/common/common.go
index 9bfece362..99ed6a58e 100644
--- a/internal/common/common.go
+++ b/internal/common/common.go
@@ -14,7 +14,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/url"
 	"os"
 	"os/exec"
@@ -87,7 +86,7 @@ func (i FakeInvoke) Command(name string, arg ...string) ([]byte, error) {
 		fpath += "_" + i.Suffix
 	}
 	if PathExists(fpath) {
-		return ioutil.ReadFile(fpath)
+		return os.ReadFile(fpath)
 	}
 	return []byte{}, fmt.Errorf("could not find testdata: %s", fpath)
 }
@@ -100,7 +99,7 @@ var ErrNotImplementedError = errors.New("not implemented yet")
 
 // ReadFile reads contents from a file
 func ReadFile(filename string) (string, error) {
-	content, err := ioutil.ReadFile(filename)
+	content, err := os.ReadFile(filename)
 	if err != nil {
 		return "", err
 	}
@@ -114,6 +113,30 @@ func ReadLines(filename string) ([]string, error) {
 	return ReadLinesOffsetN(filename, 0, -1)
 }
 
+// ReadLine reads a file and returns the first occurrence of a line that is prefixed with prefix.
+func ReadLine(filename string, prefix string) (string, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+	r := bufio.NewReader(f)
+	for {
+		line, err := r.ReadString('\n')
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return "", err
+		}
+		if strings.HasPrefix(line, prefix) {
+			return line, nil
+		}
+	}
+
+	return "", nil
+}
+
 // ReadLinesOffsetN reads contents from file and splits them by new line.
 // The offset tells at which line number to start.
 // The count determines the number of lines to read (starting from offset):
diff --git a/internal/common/common_linux.go b/internal/common/common_linux.go
index b58edbeb0..a644687ba 100644
--- a/internal/common/common_linux.go
+++ b/internal/common/common_linux.go
@@ -62,17 +62,38 @@ func BootTimeWithContext(ctx context.Context) (uint64, error) {
 		return 0, err
 	}
 
-	statFile := "stat"
+	useStatFile := true
 	if system == "lxc" && role == "guest" {
 		// if lxc, /proc/uptime is used.
-		statFile = "uptime"
+		useStatFile = false
 	} else if system == "docker" && role == "guest" {
 		// also docker, guest
-		statFile = "uptime"
+		useStatFile = false
 	}
 
-	filename := HostProcWithContext(ctx, statFile)
+	if useStatFile {
+		return readBootTimeStat(ctx)
+	}
+
+	filename := HostProcWithContext(ctx, "uptime")
 	lines, err := ReadLines(filename)
+	if err != nil {
+		return handleBootTimeFileReadErr(err)
+	}
+	if len(lines) != 1 {
+		return 0, fmt.Errorf("wrong uptime format")
+	}
+	f := strings.Fields(lines[0])
+	b, err := strconv.ParseFloat(f[0], 64)
+	if err != nil {
+		return 0, err
+	}
+	currentTime := float64(time.Now().UnixNano()) / float64(time.Second)
+	t := currentTime - b
+	return uint64(t), nil
+}
+
+func handleBootTimeFileReadErr(err error) (uint64, error) {
 	if os.IsPermission(err) {
 		var info syscall.Sysinfo_t
 		err := syscall.Sysinfo(&info)
@@ -84,39 +105,27 @@ func BootTimeWithContext(ctx context.Context) (uint64, error) {
 		t := currentTime - int64(info.Uptime)
 		return uint64(t), nil
 	}
+	return 0, err
+}
+
+func readBootTimeStat(ctx context.Context) (uint64, error) {
+	filename := HostProcWithContext(ctx, "stat")
+	line, err := ReadLine(filename, "btime")
 	if err != nil {
-		return 0, err
+		return handleBootTimeFileReadErr(err)
 	}
-
-	if statFile == "stat" {
-		for _, line := range lines {
-			if strings.HasPrefix(line, "btime") {
-				f := strings.Fields(line)
-				if len(f) != 2 {
-					return 0, fmt.Errorf("wrong btime format")
-				}
-				b, err := strconv.ParseInt(f[1], 10, 64)
-				if err != nil {
-					return 0, err
-				}
-				t := uint64(b)
-				return t, nil
-			}
-		}
-	} else if statFile == "uptime" {
-		if len(lines) != 1 {
-			return 0, fmt.Errorf("wrong uptime format")
+	if strings.HasPrefix(line, "btime") {
+		f := strings.Fields(line)
+		if len(f) != 2 {
+			return 0, fmt.Errorf("wrong btime format")
 		}
-		f := strings.Fields(lines[0])
-		b, err := strconv.ParseFloat(f[0], 64)
+		b, err := strconv.ParseInt(f[1], 10, 64)
 		if err != nil {
 			return 0, err
 		}
-		currentTime := float64(time.Now().UnixNano()) / float64(time.Second)
-		t := currentTime - b
-		return uint64(t), nil
+		t := uint64(b)
+		return t, nil
 	}
-
 	return 0, fmt.Errorf("could not find btime")
 }
 
diff --git a/load/load_linux.go b/load/load_linux.go
index 0298c8bed..06bceeb84 100644
--- a/load/load_linux.go
+++ b/load/load_linux.go
@@ -5,7 +5,7 @@ package load
 
 import (
 	"context"
-	"io/ioutil"
+	"os"
 	"strconv"
 	"strings"
 	"syscall"
@@ -76,7 +76,7 @@ func Misc() (*MiscStat, error) {
 
 func MiscWithContext(ctx context.Context) (*MiscStat, error) {
 	filename := common.HostProcWithContext(ctx, "stat")
-	out, err := ioutil.ReadFile(filename)
+	out, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
@@ -126,7 +126,7 @@ func getProcsTotal(ctx context.Context) (int64, error) {
 
 func readLoadAvgFromFile(ctx context.Context) ([]string, error) {
 	loadavgFilename := common.HostProcWithContext(ctx, "loadavg")
-	line, err := ioutil.ReadFile(loadavgFilename)
+	line, err := os.ReadFile(loadavgFilename)
 	if err != nil {
 		return nil, err
 	}
diff --git a/load/load_windows.go b/load/load_windows.go
index b48483849..8f53efae3 100644
--- a/load/load_windows.go
+++ b/load/load_windows.go
@@ -45,8 +45,8 @@ func loadAvgGoroutine(ctx context.Context) {
 
 	f := func() {
 		currentLoad, err = counter.GetValue()
-		loadErr = err
 		loadAvgMutex.Lock()
+		loadErr = err
 		loadAvg1M = loadAvg1M*loadAvgFactor1M + currentLoad*(1-loadAvgFactor1M)
 		loadAvg5M = loadAvg5M*loadAvgFactor5M + currentLoad*(1-loadAvgFactor5M)
 		loadAvg15M = loadAvg15M*loadAvgFactor15M + currentLoad*(1-loadAvgFactor15M)
diff --git a/mem/mem.go b/mem/mem.go
index ff960dacc..edaf268bb 100644
--- a/mem/mem.go
+++ b/mem/mem.go
@@ -50,6 +50,7 @@ type VirtualMemoryStat struct {
 	// https://www.centos.org/docs/5/html/5.1/Deployment_Guide/s2-proc-meminfo.html
 	// https://www.kernel.org/doc/Documentation/filesystems/proc.txt
 	// https://www.kernel.org/doc/Documentation/vm/overcommit-accounting
+	// https://www.kernel.org/doc/Documentation/vm/transhuge.txt
 	Buffers        uint64 `json:"buffers"`
 	Cached         uint64 `json:"cached"`
 	WriteBack      uint64 `json:"writeBack"`
@@ -78,6 +79,7 @@ type VirtualMemoryStat struct {
 	HugePagesRsvd  uint64 `json:"hugePagesRsvd"`
 	HugePagesSurp  uint64 `json:"hugePagesSurp"`
 	HugePageSize   uint64 `json:"hugePageSize"`
+	AnonHugePages  uint64 `json:"anonHugePages"`
 }
 
 type SwapMemoryStat struct {
diff --git a/mem/mem_linux.go b/mem/mem_linux.go
index 935331728..214a91e47 100644
--- a/mem/mem_linux.go
+++ b/mem/mem_linux.go
@@ -311,6 +311,12 @@ func fillFromMeminfoWithContext(ctx context.Context) (*VirtualMemoryStat, *Virtu
 				return ret, retEx, err
 			}
 			ret.HugePageSize = t * 1024
+		case "AnonHugePages":
+			t, err := strconv.ParseUint(value, 10, 64)
+			if err != nil {
+				return ret, retEx, err
+			}
+			ret.AnonHugePages = t * 1024
 		}
 	}
 
diff --git a/mem/mem_linux_test.go b/mem/mem_linux_test.go
index d830fbf9c..6b6fb782a 100644
--- a/mem/mem_linux_test.go
+++ b/mem/mem_linux_test.go
@@ -108,6 +108,16 @@ var virtualMemoryTests = []struct {
 			HugePageSize:   0,
 		},
 	},
+	{
+		"anonhugepages", &VirtualMemoryStat{
+			Total:         260799420 * 1024,
+			Available:     127880216 * 1024,
+			Free:          119443248 * 1024,
+			AnonHugePages: 50409472 * 1024,
+			Used:          144748720128,
+			UsedPercent:   54.20110673559013,
+		},
+	},
 }
 
 func TestVirtualMemoryLinux(t *testing.T) {
diff --git a/mem/mem_test.go b/mem/mem_test.go
index 3be56562f..79ddb0fc6 100644
--- a/mem/mem_test.go
+++ b/mem/mem_test.go
@@ -89,7 +89,7 @@ func TestVirtualMemoryStat_String(t *testing.T) {
 		Free:        40,
 	}
 	t.Log(v)
-	e := `{"total":10,"available":20,"used":30,"usedPercent":30.1,"free":40,"active":0,"inactive":0,"wired":0,"laundry":0,"buffers":0,"cached":0,"writeBack":0,"dirty":0,"writeBackTmp":0,"shared":0,"slab":0,"sreclaimable":0,"sunreclaim":0,"pageTables":0,"swapCached":0,"commitLimit":0,"committedAS":0,"highTotal":0,"highFree":0,"lowTotal":0,"lowFree":0,"swapTotal":0,"swapFree":0,"mapped":0,"vmallocTotal":0,"vmallocUsed":0,"vmallocChunk":0,"hugePagesTotal":0,"hugePagesFree":0,"hugePagesRsvd":0,"hugePagesSurp":0,"hugePageSize":0}`
+	e := `{"total":10,"available":20,"used":30,"usedPercent":30.1,"free":40,"active":0,"inactive":0,"wired":0,"laundry":0,"buffers":0,"cached":0,"writeBack":0,"dirty":0,"writeBackTmp":0,"shared":0,"slab":0,"sreclaimable":0,"sunreclaim":0,"pageTables":0,"swapCached":0,"commitLimit":0,"committedAS":0,"highTotal":0,"highFree":0,"lowTotal":0,"lowFree":0,"swapTotal":0,"swapFree":0,"mapped":0,"vmallocTotal":0,"vmallocUsed":0,"vmallocChunk":0,"hugePagesTotal":0,"hugePagesFree":0,"hugePagesRsvd":0,"hugePagesSurp":0,"hugePageSize":0,"anonHugePages":0}`
 	if e != fmt.Sprintf("%v", v) {
 		t.Errorf("VirtualMemoryStat string is invalid: %v", v)
 	}
diff --git a/mem/testdata/linux/virtualmemory/anonhugepages/proc/meminfo b/mem/testdata/linux/virtualmemory/anonhugepages/proc/meminfo
new file mode 100644
index 000000000..d158c677b
--- /dev/null
+++ b/mem/testdata/linux/virtualmemory/anonhugepages/proc/meminfo
@@ -0,0 +1,4 @@
+MemTotal:       260799420 kB
+MemFree:        119443248 kB
+MemAvailable:   127880216 kB
+AnonHugePages:  50409472 kB
\ No newline at end of file
diff --git a/net/net_linux.go b/net/net_linux.go
index de0ea7345..6e8ce67fb 100644
--- a/net/net_linux.go
+++ b/net/net_linux.go
@@ -10,7 +10,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
 	"os"
 	"strconv"
@@ -643,7 +642,7 @@ func (p *process) getUids(ctx context.Context) ([]int32, error) {
 func (p *process) fillFromStatus(ctx context.Context) error {
 	pid := p.Pid
 	statPath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "status")
-	contents, err := ioutil.ReadFile(statPath)
+	contents, err := os.ReadFile(statPath)
 	if err != nil {
 		return err
 	}
@@ -784,7 +783,7 @@ func processInetWithContext(ctx context.Context, file string, kind netConnection
 	// This minimizes duplicates in the returned connections
 	// For more info:
 	// https://github.com/shirou/gopsutil/pull/361
-	contents, err := ioutil.ReadFile(file)
+	contents, err := os.ReadFile(file)
 	if err != nil {
 		return nil, err
 	}
@@ -845,7 +844,7 @@ func processUnix(file string, kind netConnectionKindType, inodes map[string][]in
 	// This minimizes duplicates in the returned connections
 	// For more info:
 	// https://github.com/shirou/gopsutil/pull/361
-	contents, err := ioutil.ReadFile(file)
+	contents, err := os.ReadFile(file)
 	if err != nil {
 		return nil, err
 	}
diff --git a/net/net_linux_test.go b/net/net_linux_test.go
index f1b7fbaa7..eae0e71b9 100644
--- a/net/net_linux_test.go
+++ b/net/net_linux_test.go
@@ -3,7 +3,6 @@ package net
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"strings"
@@ -17,7 +16,7 @@ import (
 
 func TestIOCountersByFileParsing(t *testing.T) {
 	// Prpare a temporary file, which will be read during the test
-	tmpfile, err := ioutil.TempFile("", "proc_dev_net")
+	tmpfile, err := os.CreateTemp("", "proc_dev_net")
 	defer os.Remove(tmpfile.Name()) // clean up
 
 	assert.Nil(t, err, "Temporary file creation failed: ", err)
@@ -195,7 +194,7 @@ func TestReverse(t *testing.T) {
 }
 
 func TestConntrackStatFileParsing(t *testing.T) {
-	tmpfile, err := ioutil.TempFile("", "proc_net_stat_conntrack")
+	tmpfile, err := os.CreateTemp("", "proc_net_stat_conntrack")
 	defer os.Remove(tmpfile.Name())
 	assert.Nil(t, err, "Temporary file creation failed: ", err)
 
diff --git a/process/process_linux.go b/process/process_linux.go
index 37cb7ca44..f7989cd21 100644
--- a/process/process_linux.go
+++ b/process/process_linux.go
@@ -9,7 +9,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"math"
 	"os"
 	"path/filepath"
@@ -136,7 +135,7 @@ func (p *Process) ForegroundWithContext(ctx context.Context) (bool, error) {
 	// see https://github.com/shirou/gopsutil/issues/596#issuecomment-432707831 for implementation details
 	pid := p.Pid
 	statPath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "stat")
-	contents, err := ioutil.ReadFile(statPath)
+	contents, err := os.ReadFile(statPath)
 	if err != nil {
 		return false, err
 	}
@@ -391,7 +390,7 @@ func (p *Process) MemoryMapsWithContext(ctx context.Context, grouped bool) (*[]M
 			smapsPath = smapsRollupPath
 		}
 	}
-	contents, err := ioutil.ReadFile(smapsPath)
+	contents, err := os.ReadFile(smapsPath)
 	if err != nil {
 		return nil, err
 	}
@@ -484,7 +483,7 @@ func (p *Process) MemoryMapsWithContext(ctx context.Context, grouped bool) (*[]M
 func (p *Process) EnvironWithContext(ctx context.Context) ([]string, error) {
 	environPath := common.HostProcWithContext(ctx, strconv.Itoa(int(p.Pid)), "environ")
 
-	environContent, err := ioutil.ReadFile(environPath)
+	environContent, err := os.ReadFile(environPath)
 	if err != nil {
 		return nil, err
 	}
@@ -668,7 +667,7 @@ func (p *Process) fillFromExeWithContext(ctx context.Context) (string, error) {
 func (p *Process) fillFromCmdlineWithContext(ctx context.Context) (string, error) {
 	pid := p.Pid
 	cmdPath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "cmdline")
-	cmdline, err := ioutil.ReadFile(cmdPath)
+	cmdline, err := os.ReadFile(cmdPath)
 	if err != nil {
 		return "", err
 	}
@@ -682,7 +681,7 @@ func (p *Process) fillFromCmdlineWithContext(ctx context.Context) (string, error
 func (p *Process) fillSliceFromCmdlineWithContext(ctx context.Context) ([]string, error) {
 	pid := p.Pid
 	cmdPath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "cmdline")
-	cmdline, err := ioutil.ReadFile(cmdPath)
+	cmdline, err := os.ReadFile(cmdPath)
 	if err != nil {
 		return nil, err
 	}
@@ -705,7 +704,7 @@ func (p *Process) fillSliceFromCmdlineWithContext(ctx context.Context) ([]string
 func (p *Process) fillFromIOWithContext(ctx context.Context) (*IOCountersStat, error) {
 	pid := p.Pid
 	ioPath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "io")
-	ioline, err := ioutil.ReadFile(ioPath)
+	ioline, err := os.ReadFile(ioPath)
 	if err != nil {
 		return nil, err
 	}
@@ -741,7 +740,7 @@ func (p *Process) fillFromIOWithContext(ctx context.Context) (*IOCountersStat, e
 func (p *Process) fillFromStatmWithContext(ctx context.Context) (*MemoryInfoStat, *MemoryInfoExStat, error) {
 	pid := p.Pid
 	memPath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "statm")
-	contents, err := ioutil.ReadFile(memPath)
+	contents, err := os.ReadFile(memPath)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -802,7 +801,7 @@ func (p *Process) fillNameWithContext(ctx context.Context) error {
 func (p *Process) fillFromCommWithContext(ctx context.Context) error {
 	pid := p.Pid
 	statPath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "comm")
-	contents, err := ioutil.ReadFile(statPath)
+	contents, err := os.ReadFile(statPath)
 	if err != nil {
 		return err
 	}
@@ -819,7 +818,7 @@ func (p *Process) fillFromStatus() error {
 func (p *Process) fillFromStatusWithContext(ctx context.Context) error {
 	pid := p.Pid
 	statPath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "status")
-	contents, err := ioutil.ReadFile(statPath)
+	contents, err := os.ReadFile(statPath)
 	if err != nil {
 		return err
 	}
@@ -1026,7 +1025,7 @@ func (p *Process) fillFromTIDStatWithContext(ctx context.Context, tid int32) (ui
 		statPath = common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "task", strconv.Itoa(int(tid)), "stat")
 	}
 
-	contents, err := ioutil.ReadFile(statPath)
+	contents, err := os.ReadFile(statPath)
 	if err != nil {
 		return 0, 0, nil, 0, 0, 0, nil, err
 	}
diff --git a/process/process_linux_test.go b/process/process_linux_test.go
index e8c2e8350..87df81231 100644
--- a/process/process_linux_test.go
+++ b/process/process_linux_test.go
@@ -6,7 +6,6 @@ package process
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strconv"
 	"strings"
@@ -58,7 +57,7 @@ func Test_Process_splitProcStat(t *testing.T) {
 }
 
 func Test_Process_splitProcStat_fromFile(t *testing.T) {
-	pids, err := ioutil.ReadDir("testdata/linux/")
+	pids, err := os.ReadDir("testdata/linux/")
 	if err != nil {
 		t.Error(err)
 	}
@@ -72,7 +71,7 @@ func Test_Process_splitProcStat_fromFile(t *testing.T) {
 		if _, err := os.Stat(statFile); err != nil {
 			continue
 		}
-		contents, err := ioutil.ReadFile(statFile)
+		contents, err := os.ReadFile(statFile)
 		assert.NoError(t, err)
 
 		pidStr := strconv.Itoa(int(pid))
@@ -94,7 +93,7 @@ func Test_Process_splitProcStat_fromFile(t *testing.T) {
 }
 
 func Test_fillFromCommWithContext(t *testing.T) {
-	pids, err := ioutil.ReadDir("testdata/linux/")
+	pids, err := os.ReadDir("testdata/linux/")
 	if err != nil {
 		t.Error(err)
 	}
@@ -115,7 +114,7 @@ func Test_fillFromCommWithContext(t *testing.T) {
 }
 
 func Test_fillFromStatusWithContext(t *testing.T) {
-	pids, err := ioutil.ReadDir("testdata/linux/")
+	pids, err := os.ReadDir("testdata/linux/")
 	if err != nil {
 		t.Error(err)
 	}
@@ -154,7 +153,7 @@ func Benchmark_fillFromStatusWithContext(b *testing.B) {
 }
 
 func Test_fillFromTIDStatWithContext_lx_brandz(t *testing.T) {
-	pids, err := ioutil.ReadDir("testdata/lx_brandz/")
+	pids, err := os.ReadDir("testdata/lx_brandz/")
 	if err != nil {
 		t.Error(err)
 	}
diff --git a/process/process_solaris.go b/process/process_solaris.go
index ad1c3cfc1..dd4bd4760 100644
--- a/process/process_solaris.go
+++ b/process/process_solaris.go
@@ -3,7 +3,6 @@ package process
 import (
 	"bytes"
 	"context"
-	"io/ioutil"
 	"os"
 	"strconv"
 	"strings"
@@ -232,7 +231,7 @@ func (p *Process) fillFromPathAOutWithContext(ctx context.Context) (string, erro
 func (p *Process) fillFromExecnameWithContext(ctx context.Context) (string, error) {
 	pid := p.Pid
 	execNamePath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "execname")
-	exe, err := ioutil.ReadFile(execNamePath)
+	exe, err := os.ReadFile(execNamePath)
 	if err != nil {
 		return "", err
 	}
@@ -242,7 +241,7 @@ func (p *Process) fillFromExecnameWithContext(ctx context.Context) (string, erro
 func (p *Process) fillFromCmdlineWithContext(ctx context.Context) (string, error) {
 	pid := p.Pid
 	cmdPath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "cmdline")
-	cmdline, err := ioutil.ReadFile(cmdPath)
+	cmdline, err := os.ReadFile(cmdPath)
 	if err != nil {
 		return "", err
 	}
@@ -259,7 +258,7 @@ func (p *Process) fillFromCmdlineWithContext(ctx context.Context) (string, error
 func (p *Process) fillSliceFromCmdlineWithContext(ctx context.Context) ([]string, error) {
 	pid := p.Pid
 	cmdPath := common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "cmdline")
-	cmdline, err := ioutil.ReadFile(cmdPath)
+	cmdline, err := os.ReadFile(cmdPath)
 	if err != nil {
 		return nil, err
 	}
diff --git a/process/process_test.go b/process/process_test.go
index 9281c93c3..51f7d9cf6 100644
--- a/process/process_test.go
+++ b/process/process_test.go
@@ -4,7 +4,7 @@ import (
 	"bufio"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"os"
 	"os/exec"
@@ -19,6 +19,7 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"github.com/shirou/gopsutil/v3/internal/common"
 )
@@ -301,7 +302,7 @@ func Test_Process_Name(t *testing.T) {
 }
 
 func Test_Process_Long_Name_With_Spaces(t *testing.T) {
-	tmpdir, err := ioutil.TempDir("", "")
+	tmpdir, err := os.MkdirTemp("", "")
 	if err != nil {
 		t.Fatalf("unable to create temp dir %v", err)
 	}
@@ -347,7 +348,7 @@ func Test_Process_Long_Name_With_Spaces(t *testing.T) {
 }
 
 func Test_Process_Long_Name(t *testing.T) {
-	tmpdir, err := ioutil.TempDir("", "")
+	tmpdir, err := os.MkdirTemp("", "")
 	if err != nil {
 		t.Fatalf("unable to create temp dir %v", err)
 	}
@@ -404,7 +405,7 @@ func Test_Process_Name_Against_Python(t *testing.T) {
 		t.Skipf("psutil not found for %s: %s", py3Path, out)
 	}
 
-	tmpdir, err := ioutil.TempDir("", "")
+	tmpdir, err := os.MkdirTemp("", "")
 	if err != nil {
 		t.Fatalf("unable to create temp dir %v", err)
 	}
@@ -501,7 +502,7 @@ func Test_Process_CpuPercentLoop(t *testing.T) {
 }
 
 func Test_Process_CreateTime(t *testing.T) {
-	if os.Getenv("CIRCLECI") == "true" {
+	if os.Getenv("CI") == "true" {
 		t.Skip("Skip CI")
 	}
 
@@ -570,7 +571,7 @@ func Test_Connections(t *testing.T) {
 		defer conn.Close()
 
 		serverEstablished <- struct{}{}
-		_, err = ioutil.ReadAll(conn)
+		_, err = io.ReadAll(conn)
 		if err != nil {
 			panic(err)
 		}
@@ -773,7 +774,7 @@ func Test_IsRunning(t *testing.T) {
 }
 
 func Test_Process_Environ(t *testing.T) {
-	tmpdir, err := ioutil.TempDir("", "")
+	tmpdir, err := os.MkdirTemp("", "")
 	if err != nil {
 		t.Fatalf("unable to create temp dir %v", err)
 	}
@@ -862,3 +863,11 @@ func BenchmarkProcessPpid(b *testing.B) {
 		p.Ppid()
 	}
 }
+
+func BenchmarkProcesses(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		ps, err := Processes()
+		require.NoError(b, err)
+		require.Greater(b, len(ps), 0)
+	}
+}