diff --git a/Makefile b/Makefile
index 623d509..2a94779 100644
--- a/Makefile
+++ b/Makefile
@@ -12,12 +12,11 @@ test-local: install-deps fmt lint vet
 	@go test -v ./...
 
 test:
-	@docker run -e GO111MODULE=off -v ${shell pwd}:/go/src/${PKG_NAME} -w /go/src/${PKG_NAME} ${IMAGE} make test-local
+	@docker run --rm -v ${shell pwd}:/go/src/${PKG_NAME} -w /go/src/${PKG_NAME} ${IMAGE} make test-local
 
 install-deps:
 	@echo "+ $@"
-	@go get -u golang.org/x/lint/golint
-	@go get -d -t ./...
+	@go install golang.org/x/lint/golint@latest
 
 lint:
 	@echo "+ $@"
diff --git a/authorization/api_test.go b/authorization/api_test.go
index 5532b2b..dd8e39b 100644
--- a/authorization/api_test.go
+++ b/authorization/api_test.go
@@ -17,7 +17,6 @@ import (
 	"time"
 
 	"github.com/docker/go-plugins-helpers/sdk"
-	"github.com/stretchr/testify/require"
 )
 
 type TestPlugin struct {
@@ -150,21 +149,29 @@ func TestPeerCertificateMarshalJSON(t *testing.T) {
 	}
 	// generate private key
 	privatekey, err := rsa.GenerateKey(rand.Reader, 2048)
-	require.NoError(t, err)
+	if err != nil {
+		t.Fatal(err)
+	}
 	publickey := &privatekey.PublicKey
 
 	// create a self-signed certificate. template = parent
 	parent := template
 	raw, err := x509.CreateCertificate(rand.Reader, template, parent, publickey, privatekey)
-	require.NoError(t, err)
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	cert, err := x509.ParseCertificate(raw)
-	require.NoError(t, err)
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	certs := []*x509.Certificate{cert}
 	addr := "www.authz.com/auth"
 	req, err := http.NewRequest("GET", addr, nil)
-	require.NoError(t, err)
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	req.RequestURI = addr
 	req.TLS = &tls.ConnectionState{}
@@ -176,15 +183,25 @@ func TestPeerCertificateMarshalJSON(t *testing.T) {
 
 		t.Run("Marshalling :", func(t *testing.T) {
 			raw, err = pcObj.MarshalJSON()
-			require.NotNil(t, raw)
-			require.Nil(t, err)
+			if raw == nil {
+				t.Fatalf("Failed to marshal peer certificate")
+			}
+			if err != nil {
+				t.Fatal(err)
+			}
 		})
 
 		t.Run("UnMarshalling :", func(t *testing.T) {
 			err := pcObj.UnmarshalJSON(raw)
-			require.Nil(t, err)
-			require.Equal(t, "Earth", pcObj.Subject.Country[0])
-			require.Equal(t, true, pcObj.IsCA)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if expected := "Earth"; pcObj.Subject.Country[0] != expected {
+				t.Fatalf("Expected %s, got %s\n", expected, pcObj.Subject.Country[0])
+			}
+			if pcObj.IsCA != true {
+				t.Fatalf("Expected %t, got %t\n", true, pcObj.IsCA)
+			}
 		})
 
 	}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..b5b5252
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,11 @@
+module github.com/docker/go-plugins-helpers
+
+go 1.21
+
+require (
+	github.com/Microsoft/go-winio v0.6.2
+	github.com/docker/docker v23.0.13+incompatible
+	github.com/docker/go-connections v0.5.0
+)
+
+require golang.org/x/sys v0.10.0 // indirect
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..b66c8c8
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,8 @@
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/docker/docker v23.0.13+incompatible h1:il+Z3USrag/LJkF5apR6APO5sVpjm82jm/wp5XvO4hQ=
+github.com/docker/docker v23.0.13+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/go-connections v0.5.0 h1:USnMq7hx7gwdVZq1L49hLXaFtUdTADjXGp+uj1Br63c=
+github.com/docker/go-connections v0.5.0/go.mod h1:ov60Kzw0kKElRwhNs9UlUHAE/F9Fe6GLaXnqyDdmEXc=
+golang.org/x/sys v0.10.0 h1:SqMFp9UcQJZa+pmYuAKjd9xq1f0j5rLcDIk0mj4qAsA=
+golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
diff --git a/sdk/unix_listener_nosystemd.go b/sdk/unix_listener_nosystemd.go
deleted file mode 100644
index 1a9247b..0000000
--- a/sdk/unix_listener_nosystemd.go
+++ /dev/null
@@ -1,10 +0,0 @@
-//go:build (linux || freebsd) && nosystemd
-
-package sdk
-
-import "net"
-
-// FIXME(thaJeztah): this code was added in https://github.com/docker/go-plugins-helpers/commit/008703b825c10311af1840deeaf5f4769df7b59e, but is not used anywhere
-func setupSocketActivation() (net.Listener, error) {
-	return nil, nil
-}
diff --git a/sdk/unix_listener_systemd.go b/sdk/unix_listener_systemd.go
deleted file mode 100644
index 59c53bf..0000000
--- a/sdk/unix_listener_systemd.go
+++ /dev/null
@@ -1,45 +0,0 @@
-//go:build (linux || freebsd) && !nosystemd
-
-package sdk
-
-import (
-	"fmt"
-	"net"
-	"os"
-
-	"github.com/coreos/go-systemd/activation"
-)
-
-// isRunningSystemd checks whether the host was booted with systemd as its init
-// system. This functions similarly to systemd's `sd_booted(3)`: internally, it
-// checks whether /run/systemd/system/ exists and is a directory.
-// http://www.freedesktop.org/software/systemd/man/sd_booted.html
-//
-// Copied from github.com/coreos/go-systemd/util.IsRunningSystemd
-func isRunningSystemd() bool {
-	fi, err := os.Lstat("/run/systemd/system")
-	if err != nil {
-		return false
-	}
-	return fi.IsDir()
-}
-
-// FIXME(thaJeztah): this code was added in https://github.com/docker/go-plugins-helpers/commit/008703b825c10311af1840deeaf5f4769df7b59e, but is not used anywhere
-func setupSocketActivation() (net.Listener, error) {
-	if !isRunningSystemd() {
-		return nil, nil
-	}
-	listenFds := activation.Files(false)
-	if len(listenFds) > 1 {
-		return nil, fmt.Errorf("expected only one socket from systemd, got %d", len(listenFds))
-	}
-	var listener net.Listener
-	if len(listenFds) == 1 {
-		l, err := net.FileListener(listenFds[0])
-		if err != nil {
-			return nil, err
-		}
-		listener = l
-	}
-	return listener, nil
-}