diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1c270e624..ca22d40a2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix: # Support latest and one minor back
-        go: ["1.17", "1.18", "1.19"]
+        go: ["1.18", "1.19", "1.20", "1.21", "1.22"]
     env:
       GOFLAGS: -mod=readonly
 
diff --git a/circuitbreaker/hystrix_test.go b/circuitbreaker/hystrix_test.go
index da527576e..36bf6c2da 100644
--- a/circuitbreaker/hystrix_test.go
+++ b/circuitbreaker/hystrix_test.go
@@ -1,7 +1,7 @@
 package circuitbreaker_test
 
 import (
-	"io/ioutil"
+	"io"
 	stdlog "log"
 	"testing"
 	"time"
@@ -12,7 +12,7 @@ import (
 )
 
 func TestHystrix(t *testing.T) {
-	stdlog.SetOutput(ioutil.Discard)
+	stdlog.SetOutput(io.Discard)
 
 	const (
 		commandName   = "my-endpoint"
diff --git a/metrics/generic/generic_test.go b/metrics/generic/generic_test.go
index 435f0fc2d..415a063e8 100644
--- a/metrics/generic/generic_test.go
+++ b/metrics/generic/generic_test.go
@@ -10,9 +10,9 @@ import (
 	"go/parser"
 	"go/token"
 	"go/types"
-	"io/ioutil"
 	"math"
 	"math/rand"
+	"os"
 	"sync"
 	"testing"
 
@@ -119,7 +119,7 @@ func TestSimpleHistogram(t *testing.T) {
 // But currently works for Counter and Gauge.
 // To have a more solid test, this test should be removed and the other tests should be run on a 32-bit arch.
 func TestAtomicAlignment(t *testing.T) {
-	content, err := ioutil.ReadFile("./generic.go")
+	content, err := os.ReadFile("./generic.go")
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/metrics/prometheus/prometheus_test.go b/metrics/prometheus/prometheus_test.go
index deb15866f..75e2957a4 100644
--- a/metrics/prometheus/prometheus_test.go
+++ b/metrics/prometheus/prometheus_test.go
@@ -1,7 +1,7 @@
 package prometheus
 
 import (
-	"io/ioutil"
+	"io"
 	"math"
 	"math/rand"
 	"net/http"
@@ -23,7 +23,7 @@ func TestCounter(t *testing.T) {
 
 	scrape := func() string {
 		resp, _ := http.Get(s.URL)
-		buf, _ := ioutil.ReadAll(resp.Body)
+		buf, _ := io.ReadAll(resp.Body)
 		return string(buf)
 	}
 
@@ -54,7 +54,7 @@ func TestGauge(t *testing.T) {
 
 	scrape := func() string {
 		resp, _ := http.Get(s.URL)
-		buf, _ := ioutil.ReadAll(resp.Body)
+		buf, _ := io.ReadAll(resp.Body)
 		return string(buf)
 	}
 
@@ -85,7 +85,7 @@ func TestSummary(t *testing.T) {
 
 	scrape := func() string {
 		resp, _ := http.Get(s.URL)
-		buf, _ := ioutil.ReadAll(resp.Body)
+		buf, _ := io.ReadAll(resp.Body)
 		return string(buf)
 	}
 
@@ -130,7 +130,7 @@ func TestHistogram(t *testing.T) {
 
 	scrape := func() string {
 		resp, _ := http.Get(s.URL)
-		buf, _ := ioutil.ReadAll(resp.Body)
+		buf, _ := io.ReadAll(resp.Body)
 		return string(buf)
 	}
 
diff --git a/sd/etcd/client.go b/sd/etcd/client.go
index 287b699e1..da9743a08 100644
--- a/sd/etcd/client.go
+++ b/sd/etcd/client.go
@@ -5,9 +5,9 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"errors"
-	"io/ioutil"
 	"net"
 	"net/http"
+	"os"
 	"time"
 
 	etcd "go.etcd.io/etcd/client/v2"
@@ -81,7 +81,7 @@ func NewClient(ctx context.Context, machines []string, options ClientOptions) (C
 		if err != nil {
 			return nil, err
 		}
-		caCertCt, err := ioutil.ReadFile(options.CACert)
+		caCertCt, err := os.ReadFile(options.CACert)
 		if err != nil {
 			return nil, err
 		}
diff --git a/transport/http/client.go b/transport/http/client.go
index 7d868eee4..cfc5a72e8 100644
--- a/transport/http/client.go
+++ b/transport/http/client.go
@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"encoding/xml"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 
@@ -180,7 +179,7 @@ func EncodeJSONRequest(c context.Context, r *http.Request, request interface{})
 		}
 	}
 	var b bytes.Buffer
-	r.Body = ioutil.NopCloser(&b)
+	r.Body = io.NopCloser(&b)
 	return json.NewEncoder(&b).Encode(request)
 }
 
@@ -195,7 +194,7 @@ func EncodeXMLRequest(c context.Context, r *http.Request, request interface{}) e
 		}
 	}
 	var b bytes.Buffer
-	r.Body = ioutil.NopCloser(&b)
+	r.Body = io.NopCloser(&b)
 	return xml.NewEncoder(&b).Encode(request)
 }
 
diff --git a/transport/http/client_test.go b/transport/http/client_test.go
index 3748546c1..621639356 100644
--- a/transport/http/client_test.go
+++ b/transport/http/client_test.go
@@ -5,7 +5,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -205,7 +204,7 @@ func TestEncodeJSONRequest(t *testing.T) {
 	var body string
 
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		b, err := ioutil.ReadAll(r.Body)
+		b, err := io.ReadAll(r.Body)
 		if err != nil && err != io.EOF {
 			t.Fatal(err)
 		}
@@ -266,7 +265,7 @@ func TestSetClient(t *testing.T) {
 	var (
 		encode = func(context.Context, *http.Request, interface{}) error { return nil }
 		decode = func(_ context.Context, r *http.Response) (interface{}, error) {
-			t, err := ioutil.ReadAll(r.Body)
+			t, err := io.ReadAll(r.Body)
 			if err != nil {
 				return nil, err
 			}
@@ -278,7 +277,7 @@ func TestSetClient(t *testing.T) {
 		return &http.Response{
 			StatusCode: http.StatusOK,
 			Request:    req,
-			Body:       ioutil.NopCloser(bytes.NewBufferString("hello, world!")),
+			Body:       io.NopCloser(bytes.NewBufferString("hello, world!")),
 		}, nil
 	})
 
@@ -311,7 +310,7 @@ func TestNewExplicitClient(t *testing.T) {
 	}
 
 	dec := func(_ context.Context, resp *http.Response) (response interface{}, err error) {
-		buf, err := ioutil.ReadAll(resp.Body)
+		buf, err := io.ReadAll(resp.Body)
 		resp.Body.Close()
 		return string(buf), err
 	}
diff --git a/transport/http/jsonrpc/client.go b/transport/http/jsonrpc/client.go
index 14105aa8d..cec13b667 100644
--- a/transport/http/jsonrpc/client.go
+++ b/transport/http/jsonrpc/client.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"sync/atomic"
@@ -179,7 +179,7 @@ func (c Client) Endpoint() endpoint.Endpoint {
 
 		req.Header.Set("Content-Type", "application/json; charset=utf-8")
 		var b bytes.Buffer
-		req.Body = ioutil.NopCloser(&b)
+		req.Body = io.NopCloser(&b)
 		err = json.NewEncoder(&b).Encode(rpcReq)
 		if err != nil {
 			return nil, err
diff --git a/transport/http/jsonrpc/client_test.go b/transport/http/jsonrpc/client_test.go
index 462e0fc7d..f76019e41 100644
--- a/transport/http/jsonrpc/client_test.go
+++ b/transport/http/jsonrpc/client_test.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -169,7 +168,7 @@ func TestClientHappyPath(t *testing.T) {
 			t.Fatal("Header not set by before func.")
 		}
 
-		b, err := ioutil.ReadAll(r.Body)
+		b, err := io.ReadAll(r.Body)
 		if err != nil && err != io.EOF {
 			t.Fatal(err)
 		}
@@ -248,7 +247,7 @@ func TestCanUseDefaults(t *testing.T) {
 	)
 
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		b, err := ioutil.ReadAll(r.Body)
+		b, err := io.ReadAll(r.Body)
 		if err != nil && err != io.EOF {
 			t.Fatal(err)
 		}
diff --git a/transport/http/jsonrpc/server_test.go b/transport/http/jsonrpc/server_test.go
index 210d5b34c..44d3e68e8 100644
--- a/transport/http/jsonrpc/server_test.go
+++ b/transport/http/jsonrpc/server_test.go
@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"errors"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -99,7 +98,7 @@ func TestServerBadDecode(t *testing.T) {
 	server := httptest.NewServer(handler)
 	defer server.Close()
 	resp, _ := http.Post(server.URL, "application/json", addBody())
-	buf, _ := ioutil.ReadAll(resp.Body)
+	buf, _ := io.ReadAll(resp.Body)
 	if want, have := http.StatusOK, resp.StatusCode; want != have {
 		t.Errorf("want %d, have %d: %s", want, have, buf)
 	}
@@ -124,7 +123,7 @@ func TestServerBadEndpoint(t *testing.T) {
 	if want, have := http.StatusOK, resp.StatusCode; want != have {
 		t.Errorf("want %d, have %d", want, have)
 	}
-	buf, _ := ioutil.ReadAll(resp.Body)
+	buf, _ := io.ReadAll(resp.Body)
 	expectErrorCode(t, jsonrpc.InternalError, buf)
 	expectValidRequestID(t, 1, buf)
 }
@@ -144,7 +143,7 @@ func TestServerBadEncode(t *testing.T) {
 	if want, have := http.StatusOK, resp.StatusCode; want != have {
 		t.Errorf("want %d, have %d", want, have)
 	}
-	buf, _ := ioutil.ReadAll(resp.Body)
+	buf, _ := io.ReadAll(resp.Body)
 	expectErrorCode(t, jsonrpc.InternalError, buf)
 	expectValidRequestID(t, 1, buf)
 }
@@ -196,7 +195,7 @@ func TestCanRejectInvalidJSON(t *testing.T) {
 	if want, have := http.StatusOK, resp.StatusCode; want != have {
 		t.Errorf("want %d, have %d", want, have)
 	}
-	buf, _ := ioutil.ReadAll(resp.Body)
+	buf, _ := io.ReadAll(resp.Body)
 	expectErrorCode(t, jsonrpc.ParseError, buf)
 	expectNilRequestID(t, buf)
 }
@@ -210,7 +209,7 @@ func TestServerUnregisteredMethod(t *testing.T) {
 	if want, have := http.StatusOK, resp.StatusCode; want != have {
 		t.Errorf("want %d, have %d", want, have)
 	}
-	buf, _ := ioutil.ReadAll(resp.Body)
+	buf, _ := io.ReadAll(resp.Body)
 	expectErrorCode(t, jsonrpc.MethodNotFoundError, buf)
 }
 
@@ -219,7 +218,7 @@ func TestServerHappyPath(t *testing.T) {
 	step()
 	resp := <-response
 	defer resp.Body.Close() // nolint
-	buf, _ := ioutil.ReadAll(resp.Body)
+	buf, _ := io.ReadAll(resp.Body)
 	if want, have := http.StatusOK, resp.StatusCode; want != have {
 		t.Errorf("want %d, have %d (%s)", want, have, buf)
 	}
diff --git a/transport/http/proto/client.go b/transport/http/proto/client.go
index 25c6dbd9a..4f5aadc23 100644
--- a/transport/http/proto/client.go
+++ b/transport/http/proto/client.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"context"
 	"errors"
-	"io/ioutil"
+	"io"
 	"net/http"
 
 	httptransport "github.com/go-kit/kit/transport/http"
@@ -32,6 +32,6 @@ func EncodeProtoRequest(_ context.Context, r *http.Request, preq interface{}) er
 		return err
 	}
 	r.ContentLength = int64(len(b))
-	r.Body = ioutil.NopCloser(bytes.NewReader(b))
+	r.Body = io.NopCloser(bytes.NewReader(b))
 	return nil
 }
diff --git a/transport/http/proto/proto_test.go b/transport/http/proto/proto_test.go
index 1cc27f6d7..77b6576b9 100644
--- a/transport/http/proto/proto_test.go
+++ b/transport/http/proto/proto_test.go
@@ -2,7 +2,7 @@ package proto
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -27,7 +27,7 @@ func TestEncodeProtoRequest(t *testing.T) {
 		return
 	}
 
-	bod, err := ioutil.ReadAll(r.Body)
+	bod, err := io.ReadAll(r.Body)
 	if err != nil {
 		t.Errorf("expected no read errors but got: %s", err)
 		return
@@ -71,7 +71,7 @@ func TestEncodeProtoResponse(t *testing.T) {
 		return
 	}
 
-	bod, err := ioutil.ReadAll(w.Body)
+	bod, err := io.ReadAll(w.Body)
 	if err != nil {
 		t.Errorf("expected no read errors but got: %s", err)
 		return
diff --git a/transport/http/server_test.go b/transport/http/server_test.go
index 5c0fadb29..cef835050 100644
--- a/transport/http/server_test.go
+++ b/transport/http/server_test.go
@@ -3,7 +3,7 @@ package http_test
 import (
 	"context"
 	"errors"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -83,7 +83,7 @@ func TestServerHappyPath(t *testing.T) {
 	step()
 	resp := <-response
 	defer resp.Body.Close()
-	buf, _ := ioutil.ReadAll(resp.Body)
+	buf, _ := io.ReadAll(resp.Body)
 	if want, have := http.StatusOK, resp.StatusCode; want != have {
 		t.Errorf("want %d, have %d (%s)", want, have, buf)
 	}
@@ -255,7 +255,7 @@ func TestEncodeJSONResponse(t *testing.T) {
 	if want, have := "Snowden", resp.Header.Get("X-Edward"); want != have {
 		t.Errorf("X-Edward: want %q, have %q", want, have)
 	}
-	buf, _ := ioutil.ReadAll(resp.Body)
+	buf, _ := io.ReadAll(resp.Body)
 	if want, have := `{"foo":"bar"}`, strings.TrimSpace(string(buf)); want != have {
 		t.Errorf("Body: want %s, have %s", want, have)
 	}
@@ -327,7 +327,7 @@ func TestAddMultipleHeadersErrorEncoder(t *testing.T) {
 			t.Errorf("Header: unexpected header %s: %v", k, expect[k])
 		}
 	}
-	if b, _ := ioutil.ReadAll(resp.Body); errStr != string(b) {
+	if b, _ := io.ReadAll(resp.Body); errStr != string(b) {
 		t.Errorf("ErrorEncoder: got: %q, expected: %q", b, errStr)
 	}
 }
@@ -353,7 +353,7 @@ func TestEncodeNoContent(t *testing.T) {
 	if want, have := http.StatusNoContent, resp.StatusCode; want != have {
 		t.Errorf("StatusCode: want %d, have %d", want, have)
 	}
-	buf, _ := ioutil.ReadAll(resp.Body)
+	buf, _ := io.ReadAll(resp.Body)
 	if want, have := 0, len(buf); want != have {
 		t.Errorf("Body: want no content, have %d bytes", have)
 	}
@@ -387,7 +387,7 @@ func TestEnhancedError(t *testing.T) {
 	if want, have := "1", resp.Header.Get("X-Enhanced"); want != have {
 		t.Errorf("X-Enhanced: want %q, have %q", want, have)
 	}
-	buf, _ := ioutil.ReadAll(resp.Body)
+	buf, _ := io.ReadAll(resp.Body)
 	if want, have := `{"err":"enhanced"}`, strings.TrimSpace(string(buf)); want != have {
 		t.Errorf("Body: want %s, have %s", want, have)
 	}
diff --git a/transport/httprp/server_test.go b/transport/httprp/server_test.go
index fc5357601..4ee8f180d 100644
--- a/transport/httprp/server_test.go
+++ b/transport/httprp/server_test.go
@@ -2,7 +2,7 @@ package httprp_test
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -30,7 +30,7 @@ func TestServerHappyPathSingleServer(t *testing.T) {
 		t.Errorf("want %d, have %d", want, have)
 	}
 
-	responseBody, _ := ioutil.ReadAll(resp.Body)
+	responseBody, _ := io.ReadAll(resp.Body)
 	if want, have := "hey", string(responseBody); want != have {
 		t.Errorf("want %q, have %q", want, have)
 	}
@@ -68,7 +68,7 @@ func TestServerHappyPathSingleServerWithServerOptions(t *testing.T) {
 		t.Errorf("want %d, have %d", want, have)
 	}
 
-	responseBody, _ := ioutil.ReadAll(resp.Body)
+	responseBody, _ := io.ReadAll(resp.Body)
 	if want, have := "hey", string(responseBody); want != have {
 		t.Errorf("want %q, have %q", want, have)
 	}
@@ -151,7 +151,7 @@ func TestMultipleServerBefore(t *testing.T) {
 		t.Errorf("want %d, have %d", want, have)
 	}
 
-	responseBody, _ := ioutil.ReadAll(resp.Body)
+	responseBody, _ := io.ReadAll(resp.Body)
 	if want, have := "hey", string(responseBody); want != have {
 		t.Errorf("want %q, have %q", want, have)
 	}