diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index 53ba5de8..9c73bb36 100644
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        go-version: [1.16.x,1.17.x,1.18.x]
+        go-version: [1.17.x,1.18.x,1.19.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
     name: Test ${{ matrix.os }} with Go ${{ matrix.go-version }}
 
diff --git a/cmd/libasciidoc/root_cmd_test.go b/cmd/libasciidoc/root_cmd_test.go
index 6ab6dd6c..ca8c3b87 100644
--- a/cmd/libasciidoc/root_cmd_test.go
+++ b/cmd/libasciidoc/root_cmd_test.go
@@ -2,7 +2,7 @@ package main_test
 
 import (
 	"bytes"
-	"io/ioutil"
+	"os"
 
 	main "github.com/bytesparadise/libasciidoc/cmd/libasciidoc"
 
@@ -35,7 +35,7 @@ var _ = Describe("root cmd", func() {
 		err := root.Execute()
 		// then
 		Expect(err).ToNot(HaveOccurred())
-		content, err := ioutil.ReadFile("test/test.html")
+		content, err := os.ReadFile("test/test.html")
 		Expect(err).ToNot(HaveOccurred())
 		Expect(content).ToNot(BeEmpty())
 	})
diff --git a/go.mod b/go.mod
index 29275114..cf8a0655 100644
--- a/go.mod
+++ b/go.mod
@@ -1,15 +1,13 @@
 module github.com/bytesparadise/libasciidoc
 
-go 1.11
+go 1.17
 
 require (
 	github.com/alecthomas/chroma v0.10.0
 	github.com/davecgh/go-spew v1.1.1
 	github.com/felixge/fgtrace v0.1.0
 	github.com/google/go-cmp v0.5.5
-	github.com/kr/text v0.2.0 // indirect
 	github.com/mna/pigeon v1.1.0
-	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/onsi/ginkgo/v2 v2.1.3
 	github.com/onsi/gomega v1.17.0
 	github.com/pkg/errors v0.9.1
@@ -17,11 +15,26 @@ require (
 	github.com/sirupsen/logrus v1.7.0
 	github.com/spf13/cobra v1.1.1
 	github.com/spf13/pflag v1.0.5
-	github.com/stretchr/testify v1.7.1
-	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
+	github.com/stretchr/testify v1.8.0
 	gopkg.in/yaml.v2 v2.4.0
 )
 
+require (
+	github.com/DataDog/gostackparse v0.5.0 // indirect
+	github.com/dlclark/regexp2 v1.4.0 // indirect
+	github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
+	github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/mod v0.4.2 // indirect
+	golang.org/x/net v0.0.0-20210428140749-89ef3d95e781 // indirect
+	golang.org/x/sys v0.0.0-20210510120138-977fb7262007 // indirect
+	golang.org/x/text v0.3.6 // indirect
+	golang.org/x/tools v0.1.5 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
+
 // include support for disabling unexported fields
 // TODO: still needed?
 replace github.com/davecgh/go-spew => github.com/flw-cn/go-spew v1.1.2-0.20200624141737-10fccbfd0b23
diff --git a/go.sum b/go.sum
index 2c31e551..2a0a14d1 100644
--- a/go.sum
+++ b/go.sum
@@ -38,7 +38,6 @@ github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3Ee
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
-github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
 github.com/dlclark/regexp2 v1.4.0 h1:F1rxgk7p4uKjwIQxBs9oAXe5CqrXlCduYEJvrF4u93E=
@@ -132,11 +131,11 @@ github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvW
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
-github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
 github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
@@ -155,8 +154,6 @@ github.com/mna/pigeon v1.1.0/go.mod h1:rkFeDZ0gc+YbnrXPw0q2RlI0QRuKBBPu67fgYIyGR
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
-github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
-github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
 github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
 github.com/nxadm/tail v1.4.8 h1:nPr65rt6Y5JFSKQO7qToXr7pePgD6Gwiw05lkbyAQTE=
 github.com/nxadm/tail v1.4.8/go.mod h1:+ncqLTQzXmGhMZNUePPaPqPvBxHAIsmXswZKocGu+AU=
@@ -215,12 +212,14 @@ github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An
 github.com/spf13/viper v1.7.0/go.mod h1:8WkrPz2fc9jxqZNCJI/76HCieCp4Q8HaLFoCha5qpdg=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.7.1 h1:5TQK59W5E3v0r2duFAb7P95B6hEeOyEnHRa8MjYSMTY=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
@@ -254,7 +253,6 @@ golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTk
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/lint v0.0.0-20190909230951-414d861bb4ac/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
-golang.org/x/lint v0.0.0-20190930215403-16217165b5de h1:5hukYrvBGR8/eNkX5mdUezrA6JiaEZDtJb9Ei+1LlBs=
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
 golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
@@ -388,9 +386,8 @@ google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/l
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
-gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
@@ -405,8 +402,9 @@ gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/pkg/parser/bench_test.go b/pkg/parser/bench_test.go
index 03f5b1d4..180a68a8 100644
--- a/pkg/parser/bench_test.go
+++ b/pkg/parser/bench_test.go
@@ -1,3 +1,4 @@
+//go:build bench
 // +build bench
 
 package parser_test
@@ -5,7 +6,6 @@ package parser_test
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 
 	"github.com/bytesparadise/libasciidoc/pkg/parser"
@@ -106,5 +106,5 @@ func load(filename string) ([]byte, error) {
 	defer func() {
 		f.Close()
 	}()
-	return ioutil.ReadAll(f)
+	return io.ReadAll(f)
 }
diff --git a/pkg/parser/document_processing_parse_fragments.go b/pkg/parser/document_processing_parse_fragments.go
index fea1e404..b6951104 100644
--- a/pkg/parser/document_processing_parse_fragments.go
+++ b/pkg/parser/document_processing_parse_fragments.go
@@ -2,7 +2,6 @@ package parser
 
 import (
 	"io"
-	"io/ioutil"
 	"time"
 
 	"github.com/bytesparadise/libasciidoc/pkg/types"
@@ -14,7 +13,7 @@ func ParseFragments(ctx *ParseContext, source io.Reader, done <-chan interface{}
 	resultStream := make(chan types.DocumentFragment, bufferSize)
 	go func() {
 		defer close(resultStream)
-		b, err := ioutil.ReadAll(source)
+		b, err := io.ReadAll(source)
 		if err != nil {
 			resultStream <- types.NewErrorFragment(types.Position{}, err)
 			return
diff --git a/pkg/renderer/sgml/image.go b/pkg/renderer/sgml/image.go
index ff2dd813..ad4d398c 100644
--- a/pkg/renderer/sgml/image.go
+++ b/pkg/renderer/sgml/image.go
@@ -2,8 +2,8 @@ package sgml
 
 import (
 	"encoding/base64"
-	"io/ioutil"
 	"net/url"
+	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -122,7 +122,7 @@ func (r *sgmlRenderer) getImageSrc(ctx *context, location *types.Location) strin
 	dir := filepath.Dir(ctx.config.Filename)
 	src = filepath.Join(dir, src)
 	result := "data:image/" + strings.TrimPrefix(filepath.Ext(src), ".") + ";base64,"
-	data, err := ioutil.ReadFile(src)
+	data, err := os.ReadFile(src)
 	if err != nil {
 		log.Warnf("image to embed not found or not readable: %s", src)
 		return result
diff --git a/test/compat_test.go b/test/compat_test.go
index 3a23109f..e1f22b28 100644
--- a/test/compat_test.go
+++ b/test/compat_test.go
@@ -2,7 +2,7 @@ package test_test
 
 import (
 	"bytes"
-	"io/ioutil"
+	"os"
 	"os/exec"
 	"path/filepath"
 	"runtime"
@@ -62,7 +62,7 @@ func compare(filename string) {
 	Expect(err).NotTo(HaveOccurred())
 	// retrieve the reference document
 	path := strings.TrimSuffix(filename, ".adoc") + ".html"
-	content, err := ioutil.ReadFile(path)
+	content, err := os.ReadFile(path)
 	Expect(err).NotTo(HaveOccurred())
 	expected := string(content)
 	// if tests are executed on windows platform and git 'autocrlf' is set to 'true',
diff --git a/testsupport/console_matcher.go b/testsupport/console_matcher.go
index e60221de..b858a3c9 100644
--- a/testsupport/console_matcher.go
+++ b/testsupport/console_matcher.go
@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -53,7 +52,7 @@ func ConfigureLogger(level log.Level, opts ...TeeOption) (*ConsoleOutput, func()
 func NewConsoleOutput() *ConsoleOutput {
 	return &ConsoleOutput{
 		buf: &strings.Builder{},
-		out: ioutil.Discard,
+		out: io.Discard,
 	}
 }
 
diff --git a/testsupport/html5_matcher.go b/testsupport/html5_matcher.go
index c5665437..51dc9416 100644
--- a/testsupport/html5_matcher.go
+++ b/testsupport/html5_matcher.go
@@ -3,7 +3,7 @@ package testsupport
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"os"
 	texttemplate "text/template"
 
 	"github.com/google/go-cmp/cmp"
@@ -68,7 +68,7 @@ type htmlFileMatcher struct {
 }
 
 func (m *htmlFileMatcher) Match(actual interface{}) (success bool, err error) {
-	expected, err := ioutil.ReadFile(m.filename)
+	expected, err := os.ReadFile(m.filename)
 	if err != nil {
 		return false, err
 	}
@@ -166,7 +166,7 @@ func (m *htmlTemplateFileMatcher) Match(actual interface{}) (success bool, err e
 		return false, errors.Errorf("MatchHTMLTemplate matcher expects a string (actual: %T)", actual)
 	}
 
-	expected, err := ioutil.ReadFile(m.filename)
+	expected, err := os.ReadFile(m.filename)
 	if err != nil {
 		return false, err
 	}